Add to cart. 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. My mechanic did ask why my rocker arms were tightend down so much when he rebuilt the motor. So, this is why fuel supply lines must be large, and the longer the lines get, requiring more fittings, valves, manifolds, etc., the larger they need to be. My question is pretty much, Is a 3/8 rubber line from the tank to the pump,-9 feet, limiting my fuel supply at high rpm? Pretty typical in a 35-40 ft boat as to fuel line routing… Fuel gauge is the first thing I will do. Items 1-12 of 54. Marine hose must have the SAE J1527 Style R1 rating emblazoned on the hose to pass as seaworthy. 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). 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. 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. Do you have a rev limiter, fuel gauge, A impeller..... No rev limiter, no fuel pressure gauge, do have A impeller. x 33 ft.), USCG Approved Engine & Gear Hydraulic Hoses, USCG Approved High Pressure Hydraulic Oil Lines, SMX Bronze Freshwater Flush Cap for Groco ARG Series Strainers, Bronze Tee Adapter for Freshwater Flush System, Military Style Top Post Battery Terminals, Heavy Duty Marine Grade 316L Stainless Steel Washers, Cummins Marine Diamond Performance Series Engine Sticker, ZF Marine Transmission Sales & Current Inventory, ZF 45-85 A/IV Shift & Troll Cable Bracket, ZF Marine Transmission Oil Drain Line Kit, Centa CF-R High Inertia Torsional Coupling for ZF 63A/IV 80A/IV 85A/IV, Heavy Duty Suredrive™ Coupling for Borg Warner & ZF 25 thru 220 Transmissions, Heavy Duty Suredrive™ Coupling for ZF 301 & ZF 302 VLD/IV with Vulkan L Couplings, Vulkan Torflex 1000 Coupling / Damper Plate for ZF 220A, Centa CF/DS 30 Torsional Coupling ZF 220A/V, Centa CF-R Torsional Coupling ZF 285 286 A/IV, Vulkan Torflex Coupling ZF 280 Series Kit, Marine Torsional Flex Plate (Velvet Drive, SAE 11.5), Vulkan Vulkardan-E Coupling (2K4011S036) SAE No. (External pumps push fuel. I am in Vegas and would be willing to work for food. This ensures gravity feeds fuel to the pump. There seems to be a lot of misunderstanding in the industry as to the correct fuel line sizes to use for various engines when repowering a boat. This would be about normal. Also Mates to Larand Tank Outlet: L-7410 Sierra Marine 5/16 Inch x 8 Foot Long Fuel Line Assembly Part #: 18-8013EP1 Line: SIE 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. 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. If I remember correctly back in the days when I worked at the Phoenix Sea Ray plant then the red stripe is the marine stuff. Now substitute the fuel line for 3/8″ ID on the more critical supply or suction side (trying to save a buck) and you have now upped the fuel restriction to 3″ Hg pressure drop without even adding the fuel filtration system. 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. The max HP of the particular engine does not matter much – It’s more the design of the fuel system that dictates the total fuel flow. Units of measurement can vary, but inches of Mercury (Hg) seems to be most accepted. Just like your garden hose laying on the ground with water coming out at 60 GPH. 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). But there is a little more to it than that. Seaboard Marine delivers “Guaranteed Better Than Factory” Performance, Parts, Design, and Engineering for Cummins and other Marine Diesel applications. Substituting 5/8″ ID line in the example above halves the pressure drop to under .2 Hg. When looking at the fuel return system, we can use smaller lines for two reasons. Although kind ugly and a touch complex, it was low on restriction because of ample sizing (mostly 3/4″ pipe size) of all the fittings & hose sizes But, here is what all seem to not realize. Not sure on BBC for timing but I would set that with 3000RPM and most idle at 1000-1200 out of the water. This is an EPA – CARB Compliant FUEL LINE ASSEMBLY & Made in the USA! 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. Tell me more about Fuel Tanks and Accessories. Have you done a tune up....all filters, plugs, wires, cap/rotor/dizzy, carb...ect. 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. View as Grid List. 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. The anti-siphon valve accounts for about 1.8" Hg and a spin-on fuel filter adds about 0.5" Hg. Boat is a high compression 454, with a 750 holley. Has newer Mallory Unilite distributer, and Taylor 8mm wires. Units of measurement can vary, but inches of Mercury (Hg) seems to be most accepted. He asked if I was doing it as a rev limiter. We carry an extensive line of boat gas tanks from leading manufacturers for both inboard and outboard engine fuel tank systems. 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. 11-1/2, Vulkan Vulkardan-E Coupling (2K3411S020) SAE No. 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. Use thread sealant when connecting to tank Attwood Universal Sprayless Connector replaces traditional tank fittings and eliminates spray when connecting or disconnecting fuel fittings. From BoatUS Magazine, America's Most-Trusted Boating Magazine. Pactrade Marine Fuel Line Assembly Mercury 3/8" Hose Barbs Primer Bulb Connector See more like this. But, here is what all seem to not realize. The picture shows what a full fuel line assembly looks like. So a -10 would be 10 mm, -20 twenty mm, and so on? Compatible with all fuel tanks with standard 1/4" NPT output. 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. 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? 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. Some manufacturers will also specify a maximum value, NOT TO EXCEED, with dirty filters and that might be 8″ Hg. Yes, the 2 mic will load quicker (get dirty) and the restriction would rise faster, but isn’t that what it should do? For filling and maintaining your boat’s fuel tank systems, turn to the professionals at Wholesale Marine. A car engine, or a boat engine rebuilt by a car shop, in a jet boat will usually only run 45-50 mph. I'll be getting it out soon, and have more info. Fittings and selector valves with small internal passageways and/or convoluted hose routings increase the reading. Shop, read reviews, or ask questions about WEST MARINE Mercury/Mariner O/B Standard Fuel Line Assembly, 6' x 3/8 at the official West Marine online store. 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. 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 It ’ s fuel systems are essential in ensuring safe boat operation and trouble-free performance 750 holley )... That later as that is willing to help you replaces OEM PN: 398549 & 176748 2K4011S041 SAE. Essential in ensuring safe boat operation and trouble-free performance at 1320 HP thru a 3/8 ” line... 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