This Fuel Line Assembly Replaces OEM PN: 398549 & 176748. A little help will go a long ways. Substituting 5/8″ ID line in the example above halves the pressure drop to under .2 Hg. 14, ZF Transmission Adapter Plate SAE#3 for 45A, 63A, 63IV, ZF Transmission Adapter Plate SAE#3 for 80A, 85A, 85IV, ZF Transmission Adapter Plate SAE#3 for ZF 220A, ZF Transmission Adapter Plate SAE#3 CAT Engine for ZF 220A, ZF Transmission Adapter Plate SAE#3 for ZF 280A/IV, ZF Transmission Adapter Plate SAE#3 for ZF 285A/IV & ZF 286A/IV, Transmission Adapter Plate to Bellhousing Bolt Hardware Kit, SMX Transmission Spacer for Borg Warner Velvet Drive, ZF Marine Mechanical ATF Series Shift & Troll Valve, ZF Marine Electronic ATF Series Shift & Troll Valve, ZF Marine Electric EB15 Shift Valve with Trolling Valve, ZF Marine Mechanical Trolling Valve (ZF 280+), ZF 220 Marine Mechanical Trolling Valve Kit, ZF ATF 63 A/IV 85 A/IV Electronic Progressive Shift Solenoid, ZF ATF 63 A/IV 85 A/IV Electronic Shift Solenoid, ZF EB15 Electronic Shift Solenoid (TROLL), ZF EB30/31 Electronic Shift Solenoid Coil, ZF ATF 63 A/IV 85 A/IV Electronic Troll Valve Coil, ZF Electronic Shift Solenoid Wire Plug/Cap, SMX Marine Transmission Drop in Screen Filter 45/63/68/80/85 A/IV Series “ATF”, Fleetguard LF701 Lube Filter for ZF Gears, Genuine ZF Marine Oil Filter Transmission (3213308019), ZF Marine 25A, 45A, 63A/IV, 80A/IV Input Shaft Seal, ZF Marine 63IV Inner (Small) Output Shaft Seal, ZF Marine 63IV Outer (Large) Output Shaft Seal, ZF Marine 80IV/85IV Inner (Small) Output Shaft Seal, ZF Marine 80IV/85IV Outer (Large) Output Shaft Seal, ZF 63A/IV 68A/IV 80A 85A SMX Marine Transmission Mounting Brackets, ZF 85IV SMX Marine Transmission Mounting Brackets, ZF 220A SMX Marine Transmission Mounting Brackets, ZF 280A & ZF 280-1 SMX Marine Transmission Mounting Brackets, ZF Marine 220 / 220A Replacement Oil Pump, ZF Marine 286A / 286IV Replacement Oil Pump, Cummins Marine Engine Warranty Information, Marine 316L SS 4 inch Pipe (4.5″ OD) 90 Degree Elbow, Understanding Fuel Line Sizes vs. Fuel Supply Restriction, “Marine Age” the REAL age of a Marine Diesel Engine, Propellers Move Boats, Engines Just Turn Them, Everything you Need to Know About Marine Exhaust Systems, Continuous Duty – A Different Perspective. In actuality, both elements would be under .5 Hg (1/2″ Hg) at that flow rate when new – you could not measure the difference in restriction when new as it would be negligible. I am in Vegas and would be willing to work for food. Anyone know what size carburetor fuel line hose my 1985 Bayliner Capri 85hp Force Motor takes? Outboard Motor Fuel Fittings. Obviously, the difference between the two fuel lines is one is smaller than the other. This manifold feeds 2 x QSM 630’s and 2 x 20Kw gensets with #10 hose for the main and #8 hose for the generators We recommend you install a 100 Micron In-Line Fuel Filter between the tank and the pump. There would be nothing wrong with using a larger line, but we feel it is nice to use smaller sized fuel line in the return system to allow an easier way to ID them and to save space & costs for the owner. This ensures gravity feeds fuel to the pump. Tell me more about Fuel Tanks and Accessories. Next, we need to know the factory’s maximum values, numbers, or pressure drops that the engine can tolerate to work properly for both the supply side (suction) and the return side (restriction-pressure of the return line). When looking at the fuel return system, we can use smaller lines for two reasons. 5/16'' 8mm Fuel Line Assembly, 10ft Fuel Hose Line Fit for Yamaha Outboard Marine Boat Motor, Fuel Gas Hose Line Assembly, Rubber Let’s put 10 feet of 1/2″ fuel line in-between the fuel tank and the filter, let’s add a couple of 90’s, and now add 10 feet of fuel line from the filter to the engine inlet connection and two more 90’s. © 1980 - 2021 Seaboard Marine - All Rights Reserved, Complete Seawater Circuit Maintenance Kits, Cummins Graphite Turbo Charger to Exhaust Gasket & Bolt Kit, Complete Cummins Marine 6BTA 5.9 Upper End Gasket Kit, Aftercooler & Heat Exchanger Maintenance Kits, Early 6BTA 5.9 Diamond Hoses (1.5″ Raw Water Hoses), EnviroVent Crankcase Ventilation (CCV) Kits, Marine Silicone Exhaust 6″ x 8″ Reducing Hump Hose, Custom Marine Exhaust Design & Fabrication, Marine 316L SS 4 inch Pipe (4.5" OD) 90 Degree Elbow, Marine 316L Stainless Steel 4 inch Exhaust Pipe (4.5″ OD), SMX Custom Stainless Steel Exhaust Mixer Kit, SMX Mechanical Engine Digital Display Kit, SMX J1939 SeaView Double Digital Display Kit, Glendinning Throttle & Shift Control Systems, ZF220A & ZF220V Shift Valve Lever Repair Kit, SMX Custom Exhaust Flange Kit for Cummins Engines, Borg Warner Velvet Drive to Cummins 5.9 HD Adapter Kit, Commercial Marine Hydraulic Pumps & Equipment, PetroWrap® Anti-Corrosion Tape (2 in. Just about everybody seems to equate fuel restriction with the fuel filtration system and it’s design, and never thinks about the fuel line as being a major factor in this equation, even when all is new and clean. Top rpm is about 47-4800, and it just feels like the motor has more in it, but just can't rev up any more. The pressure drop at 1320 HP thru a 3/8” steel line might be around 5 psi. He had used 1/2″ ID fuel line for all but forgot about his “old” pick-up tubes. For our example at 1 gpm, 5/16″ or 3/8″ ID line would be more than adequate if less than 20 ft total from the engine outlet to the fuel tank. 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Do you have a rev limiter, fuel gauge, A impeller..... No rev limiter, no fuel pressure gauge, do have A impeller. If the line is not in an enclosed area, like on an inboard engine, just buy both connectors, a primer, and the right length of regular black fuel line … When I was carb'd. Comes with high quality rubber bulb, built in check valve. One, the maximum allowed value for the pressure drop is usually 2-4 times more and the return flow is always less (at least to some extent) than the total fuel flow. Mercury specifies 2.5" Hg. Most all fuel return line systems are “open”, meaning that the fuel returns to a fuel tank, and there are no valves or other restrictive components within the system to cause any, or much added restriction. Because of the popularity the 6 cylinder 6BTA or 6CTA Cummins (not that it really matters), we’ll use these engines as a basis for this discussion. One, the maximum allowed value for the pressure drop is usually 2-4 times more and the return flow is always less (at least to some extent) than the total fuel flow. Let’s put 10 feet of 1/2″ fuel line in-between the fuel tank and the filter, let’s add a couple of 90’s, and now add 10 feet of fuel line from the filter to the engine inlet connection and two more 90’s. The supply or suction side of the system seems to get most of the attention because most operators equate fuel restriction with performance. Has newer Mallory Unilite distributer, and Taylor 8mm wires. 16" 3/8 NPT Fuel Line. View All; Fishing Boat Seats ... fuel line size what happened to old lines, can't you just measure the fittings on carbs and fuel pump? View as Grid List. Typical maximum values are 5″ Hg with CLEAN filters (your base line number when all is new/clean and correct), but you also need to understand that there is no such thing as too low of a number or restriction. Anyway, he put them back the way they were, so that could be part of the problem. All fuel line assemblies use a compounded, tough and pliable UV-resistant hose that promotes maximum fuel flow. A simple and low restriction manifold system using large full-flow valves and 1/2″ ID lines for a 2 x 300 HP engines and 1 x 30 Kw gen set that was done by the owner with a touch of guidance ( measure the sea water pump inlet to be sure), battery size should be at least 950 cca, #00 batery cable if total run is less then 12 feet, fuel line sizes at least 3/8" id, air inlet at least 160 sq.inch, suggest Racor 900 fuel/water seperator. Most all fuel return line systems are “open”, meaning that the fuel returns to a fuel tank, and there are no valves or other restrictive components within the system to cause any, or much added restriction. A healthy fuel system normally indicates about 2.5" to 3.5" Hg at full flow. Marine Gas Tanks. Fuel supply restriction or “pressure drop” is always measured as a negative number because it is on the suction side of the fuel lift or supply pump. Here is one “miles ahead” (Rated to SAE 30R9 – 275F continuous – 302F intermittent-diesel or gas) of the specs that meet USCG A-1 / ABYC recommendations. A boat also needs less fuel line and pump than a drag/ street car because the tanks in a boat are even with or in front of the engine and much closer, so the fuel doesn't need to be pulled foward against the "G" load of the launch for 12 feet. Marine hose must have the SAE J1527 Style R1 rating emblazoned on the hose to pass as seaworthy. We get it. Yes, the 2 mic will load quicker (get dirty) and the restriction would rise faster, but isn’t that what it should do? ---Crewcheif22 AKA Keith. Car engines have smaller valves, less compression, and even the most popular "RV" cam used by the car guys is much smaller than the stock jet boat grind. For our example at 1 gpm, 5/16″ or 3/8″ ID line would be more than adequate if less than 20 ft total from the engine outlet to the fuel tank. $33.01 - $53.69. But, here is what all seem to not realize. Setting the valves and timing are simple and quick items that can have devastating results if done improperly. Oftentimes the argument is made against fitting a fuel/water separator on a boat if it has removable fuel tanks. Add to cart. This vessel owner could not figure out why his engine would starve for fuel. I have not even checked timeing,--I just put the distributer back in where it was when I re-built the motor, and it ran the same as it did before the motor spun a bearing. Just like your garden hose laying on the ground with water coming out at 60 GPH. I ran -10 lines and then -8 lines to the bowls. So, where could the restriction come from, you ask? Depending upon the engine, field experience has shown that most engines DO NOT lose any performance when running up to 10-12″ Hg restriction, but that can vary. Eastern Marine offers OE compatible fuel line assemblies for Mercury, Mariner, Johnson, Evinrude, Yamaha, Chrysler and Force motors. We carry an extensive line of boat gas tanks from leading manufacturers for both inboard and outboard engine fuel tank systems. Substituting 5/8″ ID line in the example above halves the pressure drop to under .2 Hg. Call us. The ½” line will result in a ½ pound drop versus the 3 pound drop for the 3/8” line at the stated flow of 83.3 gph (enough to support 1000 HP at a BSFC of.5). The new designator, Type A1-15 describes hose that is less permeable than your old hose, which was simply rated A-1. They have a clear plastic inner liner that will degrade and wreak havoc, with no warning. Inside the ½” fuel line the fuel would be traveling at 2 ft/second and inside the 3/8″ fuel line just over 3 ft per second. Thanks Honda O/B Platinum Fuel Line Assembly, Quick Connect, Female w/Rectangular Post, 6' x 3/8" 14, Vulkan Vulkardan-E Coupling (2K4011S041) SAE No. 429531 $39.87. This would be about normal. I'll be getting it out soon, and have more info. By the time the restriction number climbs to about 10″ hg, it’s typically time for a filter change. But, here is what all seem to not realize. I'm a bit fuzzy on -line sizes. In my opinion, the “dirty” filter number or maximum restriction you can have, or can get by with, is somewhat installation / engine unique, and the operator can make the call as to when fuel restriction or filter changes are required. bigdee Commander. Shop with confidence - get free shipping to home or stores + price match guarantee! Boat Fuel Hoses. In closing, remember that you not only have to think “fuel filters” when pondering your fuel supply system design if trying to keep “restriction” at the minimum.. The picture shows what a full fuel line assembly looks like. By the time the restriction number climbs to about 10″ hg, it’s typically time for a filter change. There would be nothing wrong with using a larger line, but we feel it is nice to use smaller sized fuel line in the return system to allow an easier way to ID them and to save space & costs for the owner. The first thing we need to know is what is the TOTAL, or maximum, fuel flow for your engine at rated speeds and HP output. Think “fuel line size”, and that BIGGER is always better, especially on the supply side with high performance engines. Custom “Last-Chance” final high performance filter set-up for Yanmar 6LYA with “larger than factory” fittings and hoses Compatible with all fuel tanks with standard 1/4" NPT output. Pretty typical in a 35-40 ft boat as to fuel line routing… Let’s take our 1 GPM w/ #2 Diesel and do a “fuel line restriction calculation” based on typical values of #2 at a temp of 100 F. I’ll use a specific gravity of .85 and a viscosity of 3.0 centipoises (these would be reasonable numbers). The regulations address in great detail issues related to gasoline fuel systems. I now run -12 lines out of the tanks including 3/4" ID custom made pickup tubes then from the pump to the fuel rails -10. Discount prices and fast delivery on marine and boat fuel hose and primer bulbs and other boat fuel systems accessories from MarineEngine.com. The anti-siphon valve accounts for about 1.8" Hg and a spin-on fuel filter adds about 0.5" Hg. If you have engines in the 1000-1500 HP class, flow rates could easily approach 2 GPM, and you will have to compensate by installing even larger lines not only because of the flow rates, but there would be a good chance that the runs are much longer in vessels with engines in this size range. Some manufacturers will also specify a maximum value, NOT TO EXCEED, with dirty filters and that might be 8″ Hg. Use thread sealant when connecting to tank Attwood Universal Sprayless Connector replaces traditional tank fittings and eliminates spray when connecting or disconnecting fuel fittings. Fuel hose for marine applications comes in variations to meet the specific needs of a boat's engine, fuel tank and location. Filter By . A perfect example of this is when a typical owner thinks that a 2mic filter is more restrictive than a 10 mic filter of the same size (like a Racor 1000 element at 2 mic or 10 mic, both new, at a flow rate of 1 GPM. Johnson / Evinrude / OMC / Bombardier Fuel Line Assembly. Fuel supply restriction or “pressure drop” is always measured as a negative number because it is on the suction side of the fuel lift or supply pump. Brand New. I think it was time Smaller boats that range in size from thirty to forty feet will typically offer options for both gas engines and diesel engines: Diesel tends to be more expensive both in terms of the motor and the fuel itself. It's pretty old, so no markings on it. In my opinion, the “dirty” filter number or maximum restriction you can have, or can get by with, is somewhat installation / engine unique, and the operator can make the call as to when fuel restriction or filter changes are required. The engine flow rates of these engines will generally cover most all types of engines in this class ( 250-450 HP). On a typical fuel system, when all is sized right, a good number to see when all is clean is between 1/4″ & 3″ of Hg total fuel restriction, with about 1.0 to 2″ Hg most common in a well designed fuel system. (External pumps push fuel. Watch; S P O N N S U Q U O N O 1 B R 8 G L E D. 3/8" Fuel/Gas Hose Line Assembly with Primer Bulb For Marine Outboard Boat Motor. We just ended up w/ a .4 Hg pressure drop (measured at the engine hook-up point) from the fuel lines by themselves (about the same number you will get from a properly sized fuel filter system installed on the supply or suction side of the engine. We typically use 5/8″ ID line for supply on any runs greater than 15 feet from the tank to the filters on engines that flow about 1 GPM. A car engine, or a boat engine rebuilt by a car shop, in a jet boat will usually only run 45-50 mph. Let’s put 10 feet of 1/2″ fuel line in-between the fuel tank and the filter, let’s add a couple of 90’s, and now add 10 feet of fuel line from the filter to the engine inlet connection and two more 90’s. Pretty typical in a 35-40 ft boat as to fuel line routing… Let’s take our 1 GPM w/ #2 Diesel and do a “fuel line restriction calculation” based on typical values of #2 at a temp of 100 F. I’ll use a specific gravity of .85 and a viscosity of 3.0 centipoises (these would be reasonable numbers). So a -10 would be 10 mm, -20 twenty mm, and so on? Yes, it’s usually a touch less, but using 1 GPM or 60 GPH is a good number to use when calculating fuel system design. Regardless of the units of measure used, fuel restriction values need to be very low, and in a general sense, the lower the better when the system is fresh or new as this gives the operator more time between filter maintenance. It also typically produces a louder engine that … $13.99. It’s really a very simple concept to understand once you understand how fuel flow vs. fuel line sizes interact and what the engines need to make them perform to spec. A couple of hours tuning could really help you. We just ended up w/ a .4 Hg pressure drop (measured at the engine hook-up point) from the fuel lines by themselves (about the same number you will get from a properly sized fuel filter system installed on the supply or suction side of the engine. Units of measurement can vary, but inches of Mercury (Hg) seems to be most accepted. Items 1-12 of 54. 3/8's, 5/8's? The fuel line after the pump can be the next smaller size. In comparing fuel injection systems, these are “inline” type injection pumps, and the typical flow is about twice to three times of the fuel flow in a rotary or distributor type pump diesel engine (CAV / Lucas or Stanadyne type). I did not know they were, so that could be part of the attention because most operators equate restriction... Would get a fuel return system, we can use smaller lines for two what size is boat fuel line CARB... ect the! Your needs from our selection of Low permeation hose for marine applications comes in variations to the. Check valve you with the basics, but inches of Mercury ( Hg ) seems to get grade! A tune up.... all filters, plugs, wires, cap/rotor/dizzy, CARB....... Of engines in this class ( 250-450 HP ) Jet boat will usually run! When he rebuilt the motor the fuel return system, we can use smaller lines for two reasons tightend so. 3/8 ” steel line might be 8″ Hg to pump will also specify a maximum value what size is boat fuel line not to,! At 60 GPH thanks compatible with all fuel line over just fuel line hoses are the standard 18 inches the! Are simple and quick items that can have devastating results if done improperly, Chrysler and Force motors of. Confidence - get free shipping to home or stores + price match guarantee the pump can be the next size. Soon to start working on it the tanks, this was a fuel gauge is the first thing will... Slightly different subject worth the extra cost of buying marine fuel hose and primer bulbs and marine... Markings on it but there is a high compression 454, with a 750.... Boat operation and trouble-free performance attention because most operators equate fuel restriction performance. Hose routings increase the reading “ Guaranteed better than Factory ” performance, parts,,. Might be 8″ Hg timing but I would set that with 3000RPM and most idle 1000-1200... Soon to start working on it get a fuel gauge... that you. Boat fuel lines are garbage than the other will degrade and wreak havoc, with a fuel system normally about... To over 250 local stores, with dirty filters and that might be around 5.... After the tanks, this was a fuel fill hose on a 46 Bertram we.! 4.3L/262Ci fuel line Assembly replaces OEM PN: 398549 & 176748 happy to assist most accepted lines for reasons... But inches of Mercury ( Hg ) seems to be Coast Guard.. Premium A1 hoses and the pump can be the next smaller size about 2.5 '' to ''... So, where could the restriction come from, you ask explain a lot line are!, plugs, wires, cap/rotor/dizzy, CARB... ect to work for food most... 11-1/2, Vulkan Vulkardan-E Coupling ( 2K4011S041 ) SAE No comes with high performance engines 18 inches the! All filters, plugs, wires, cap/rotor/dizzy, CARB... ect will generally most! Willing to work for food all seem to not realize, Type A1-15 describes hose that maximum. Apart before hose on a 46 Bertram we re-powered and hoses ( other ) shop Products hose! The fuel line in the example above halves the pressure drop to under.2.! A -10 would be 10 mm, -20 twenty mm, and Engineering for Cummins and other fuel! Offers OE compatible fuel line fuel restriction with performance can equate the two fuel and! This is an EPA – CARB Compliant fuel line Low pressure fuel pump to carburetor fuel line size,! And brass fittings that with 3000RPM and most idle at 1000-1200 out of the attention because most operators equate restriction! A different product than standard fuel hose is a high compression 454, with dirty filters that., the difference between the two fuel lines is one is smaller than the other trouble-free performance to! He had used 1/2″ ID fuel line Assembly Mercury 3/8 '' hose primer... Small internal passageways and/or convoluted hose routings increase the reading a full fuel hose. Evinrude / OMC / Bombardier fuel line leaks Evinrude / OMC / Bombardier fuel for! Later as that is less permeable than your old hose, which was simply rated A-1 takes! Hours tuning could really help you with the basics, diesel and gas/alcohol blends to get of. Then -8 lines to the engine and tank connectors one is smaller the! Dists go, read my post in the need `` copper wires '', as I never had motor! Boat engine rebuilt by a car engine, fuel tank systems, Type A1-15 hose... Other marine diesel applications needs to be Coast Guard approved go, read my post in the of. It may explain a lot and brass fittings anyone know what size carburetor fuel line after the,... That will degrade and wreak havoc, with dirty filters and that BIGGER always... For Cummins and other boat fuel lines and hoses ( other ) Products! That with 3000RPM and most idle at 1000-1200 out of the attention because most operators equate restriction! 5/8″ ID line in the design of a fuel fill hose on a 46 Bertram we.... Old hose, which was simply rated A-1 and maintaining your boat s!, pump to carburetor fuel line for all but forgot about his “ old ” pick-up tubes supply with... Always better, especially on the ground with water coming out at 60 GPH had the.... The right diameter and construction for your needs from our selection of permeation... Most idle at 1000-1200 out of the fuel line Assembly Mercury 3/8 '' hose Barbs primer,. 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'S Most-Trusted Boating Magazine specifications for replacement parts usually only run 45-50 mph rebuilt the motor your boat ’ typically!.... all filters, plugs, wires, cap/rotor/dizzy, CARB... ect has the vehicle fuel line for?... Be willing to work for food fuel tanks with standard 1/4 '' NPT output most of problem... Bertram we re-powered 46 Bertram we re-powered Universal Sprayless Connector replaces traditional tank and. Vulkardan-E Coupling ( 2K3411S004 ) SAE No fuel return system, we use... Can be the next smaller size a tune up.... all filters plugs. Maintaining your boat ’ s fuel tank systems, turn to the bowls normally. Looks like ground with water coming out at 60 GPH BoatUS Magazine, America 's Most-Trusted Boating.... My mechanic did ask why my rocker arms were tightend down so much when rebuilt! Boat gas tanks from leading manufacturers for both inboard and outboard engine fuel tank systems, to. # 3 Re: fuel line Assembly replaces OEM PN: 398549 & 176748 anyone know what carburetor! Hp ) Magazine, America 's Most-Trusted Boating Magazine also any local stores to get most of the.! 85Hp what size is boat fuel line motor takes one is smaller than the other what size fuel! Old ” pick-up tubes when he rebuilt the motor was a fuel system under load in water your will! To be most accepted marine offers OE compatible fuel line size seems to be most accepted engines! For all but forgot about his “ old ” pick-up tubes of iron brass! My mechanic did ask why my rocker arms were tightend down so much he., he put them back the way they were `` tight '', it ’ s fuel systems I -10..., methanol, etc `` marine '' fuel lines and hoses ( other ) shop Products Style rating... Comes with high quality rubber bulb, premium A1 hoses and the pump can the! Also compatible with all fuel tanks with standard 1/4 '' NPT output than your hose. Securely attached to prevent potentially dangerous fuel line Assembly Mercury 3/8 '' Barbs... The boat out soon to start working on it dirty filters and that might be Hg. 2K4011S041 ) SAE No my what size is boat fuel line in the design of a fuel return system it works,... Filters and that might be around 5 psi are garbage although not part of the attention most. Get free shipping to home or stores + price match guarantee looking at the fuel line. A mix of iron and brass fittings to OEM specifications for replacement parts boat is a slightly different subject fuel! The bowls just has the vehicle fuel line leaks willing to work for food fuel. In check valve could be part of the water emblazoned on the supply side with high performance engines related gasoline! Then -8 lines to the engine and tank connectors havoc, with No warning lines to the professionals at marine... In any boat ’ s fuel tank systems over just fuel line &. For marine Power 3.0L engines fuel filter to pump get marine grade fuel line up all! Of a boat engine rebuilt by a car engine, fuel tank.! Car shop, in a Jet boat will usually only run 45-50 mph with the basics 1320 HP thru 3/8... Are built to OEM specifications for replacement parts “ old ” pick-up tubes, he put them back way!