| Horsepower | Rigid Line Size | -AN Hose Size | Pump GPH at System Pressure | Pump GPH Free Flowing |
| 200 | 5/16" | -04 | 17 | 46 |
| 350 | 3/8" | -06 | 29 | 81 |
| 550 | 1/2" | -08 | 46 | 127 |
| 800 | 5/8" | -10 | 67 | 184 |
What size fuel line do I have?
So the easiest way to tell the size of your fuel line, which is tubing, is to use a combination wrench. Whichever one slips over snuggly is the winner. Thanx....looks like mine is 3/8. I couldn't even get a 5/16 wrench to fit it. Tubing is OD (outside diameter) and Pipe is ID (inside diameter).
How much HP can a 3/8 inch fuel line support?
A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Given a big enough pump a 3/8” steel line could support 1000 HP. The simple way to know is to install an electronic fuel pressure gauge.
What is the difference between a 3/8 and 5/16 fuel line?
Obviously, the difference between the two fuel lines is one is smaller than the other. We get it. But there is a little more to it than that. The 5/16″ fuel line is actually perfect for smaller outboards. Being a little smaller than the 3/8″ hose, it works great for little kicker motors, and sailboat outboard engines.
What is a fuel line made of?
It is commonly made of reinforced rubber to prevent splitting and kinking. The United States Environmental Protection Agency defines a fuel line as “all hoses or tubing designed to contain liquid fuel or fuel vapor.
Is 3/8 fuel line big enough?
A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Given a big enough pump a 3/8” steel line could support 1000 HP. The simple way to know is to install an electronic fuel pressure gauge. If the pressure falls as the engine RPM's go up you need more pump head.
What size is standard fuel hose?
Fuel Hose SizesAN SizeTube or Hose ODTube or Hose ID-63/8”.297”-81/2”.391”-105/8”.484”-123/4”.609”Mar 6, 2019
What size is 10 an fuel line?
5/8"Russell Performance Technical SupportAN SizeMetal Tube O.D.Thread Size-8 AN1/2"3/4" - 16 SAE-10 AN5/8"7/8" - 14 SAE-12 AN3/4"1-1/16" - 12 SAE-16 AN1"1-5/16" - 12 SAE5 more rows
Does bigger fuel line size matter?
Fuel line diameter matters A LOT! A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small: you won't be able to support your horsepower goal. If the diameter is too big: the lines will take longer to pressurize.
What size is metal fuel line?
For most recent cars, supply is 5/16" and return and vent are both 1/4".
How do you measure fuel line diameter?
0:573:13How To Measure the Diameter Of Any Hose - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it's 6 over 16 so 6 6 / 16 very very simplest and all that you do is you're taking 6 sixteenthsMoreSo it's 6 over 16 so 6 6 / 16 very very simplest and all that you do is you're taking 6 sixteenths of an inch and divide it by 2 if you can so 6 16 divided by 2 is 3/8.
What is 8 an fitting?
“AN” Thread Sizes For example, an -8 AN fitting translates to an 8/16 inches, or 1/2-inch. You can convert any AN fitting to its nominal inch size by dividing the AN number by 16 as follows: -4 AN = 4/16″ or 1/4″.
What size is 6AN fuel line?
3/8" ODFYI: Popular fuel line sizes: -6AN (=3/8" OD) -8AN (=1/2" OD) -10AN (=5/8" OD)
What does 10AN mean?
AN Fitting Size GuideMale Thread SizeAN Size*Equivalent Tube Size (Nominal OD)7/16-204AN1/4"9/16-186AN3/8"3/4-168AN1/2"7/8-1410AN5/8"3 more rows
Is a shorter fuel line better?
In the case of fuel lines, two influences increase friction and therefore fuel pressure drop. The first is the length of the fuel line – the longer it is the more friction will be incurred. The second is flow rate – as the rate is increased so is friction.
How important is fuel line size?
Does size really matter when it comes to fuel lines? According to the fuel delivery system experts at Fuelab, it does. It's because fuel line size and length have a direct effect on the amount of fuel pressure drop your fuel system will experience.
What size fuel return line should I use?
The Fuel Return Line should be at least the same size, or one size larger than the supply. Make sure there are no sharp bends or kinks. The return line should direct fuel close to the bottom of the tank and away from the pickup.
What is the standard for port fittings?
Port Fittings conform to AN standards - typically per Military Standard MS33649. The cone end uses Straight Thread and a 37° cone. The male port end of the fitting uses Straight Thread, and is received by a female port of corresponding size and thread pitch. Port Fittings require use of O-rings.
What are the different types of fittings used in racing?
The fittings we will discuss are Adapter Fittings (also called Standard, or Union), Port Fittings, and Pipe Fittings, as well as thread types and size standards associated with each.
Can mismatched lines come apart?
Mismatched lines can come apart under pressure. Verify that inner diameters match! Common Types of Fittings. Adapter Fittings Adapter Fittings – also known as Standard Fittings or Union Fittings – are commonly used to connect fuel line tubes and hoses to fuel pumps, fuel regulators, and fuel filters.
Do pipe fittings need O rings?
Threads must be clean and precise, to make up for gaps between threads that allow for leakage. Pipe Fittings, which use Tapered Thread, don’t use O-rings, but rather must use compounds or Teflon Tape to help seal the threads.
Why should fuel pressure lines be sized?
Fuel pressure lines should be sized to expected capacity and fluid velocity should be kept below 4 FPS to reduce the Reynolds Number which signifies excess turbulence and will result in reduced performance . With such low volume use of the fuel system capacity, return fuel lines are usually inadequately sized.
What is the purpose of a return fuel line?
The purpose of the return line is to return unused fuel delivered to the engine back to the fuel tank. Any pump ran at a constant volume cannot be dead headed.
When the pressure drop in the line is not sufficiently close to ambient, the gasses do not condense back into
When the pressure drop in the line is not sufficiently close to ambient the gasses do not condense back into the fuel and the air does not form complete bubbles in the line to escape the fuel in the tank.
Can a fuel pump be dead headed?
Any pump ran at a constant volume cannot be dead headed. When the fuel is bypassed it experiences a pressure drop and any air dissolved or entrained in the fuel boils out forming air bubbles, as well as any fuel components transforming into a gaseous state.
Why use smaller lines in fuel return?
When looking at the fuel return system, we can use smaller lines for two reasons. 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.
What is fuel return line pressure?
Fuel return line pressures are also something that needs to be considered in the design of a fuel system. 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.
Why is fuel restriction negative?
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. Units of measurement can vary, but inches of Mercury (Hg) seems to be most accepted. Regardless of the units of measure used, fuel restriction values need to be very low, and in a general sense, ...
Can you equate fuel restriction with performance?
The supply or suction side of the system seems to get most of the attention because most operators equate fuel restriction with performance. Yes, you can equate the two but not as most think. We’ll get to that later as that is a slightly different subject. Very old fuel manifold system done a mix of iron and brass fittings.
How much methanol does a gasoline engine use?
Methanol fuels use approximately double the amount of fuel of gasoline to reach a target power level. In the event that you are using Methanol in replacement of an intercooler (commonly referred to as running the engine "wet") you may use even more Methanol.
Can you oversize a fuel line?
Also Yes, having a very large fuel line on the pressure side (feed line) without enough volume can slow fuel flow and cause issues. On the return line, you cannot oversize the line as it is simply a vessel for getting unused fuel back to the fuel tank.
What size hose do I need for a 115 HP outboard?
But most smaller outboards have fittings or quick connects on them that are set for a 5/16″ hose. It’s basically the standard hose for the smaller engines. Like we said in the beginning, the 3/8″ line is required on anything that is larger than a 115 HP engine.
What is the A2 hose used for?
A2 Hoses: Are used for the fuel tank vent hose below the deck. They aren’t designed to have fuel sitting in the hose but do have a fire-resistant covering on the outside of the hose. B1 Hoses: Are used for feeding fuel from the boat fuel tank to the fuel filter bracket BUT ABOVE THE DECK OR NOT ENCLOSED!
What is the difference between a B2 and A1 hose?
They are basically the same as the A1 hoses but do not have the fire-resistant covering that is on the outside of the hose. B2 Hoses: Are used for the fuel tank vent hose BUT ABOVE THE DECK OR NOT ENCLOSED! Basically the same as the A2 hose but without the fire-resistant covering on the outside of the hose.
How to know what fuel line is on a combustion engine?
The basic functionality of a combustion engine and the fuel demand for the horsepower is the same! You will also know what fuel line is supposed to be there by looking at the hook up on the engine. Wherever you hook up the fuel line on the engine there will be a hose barb. If it is a 5/16″ or a 3/8″ hose barb, that is what you should use.
What is the difference between a 5/16 and 3/8 fuel line?
We get it. But there is a little more to it than that. The 5/16″ fuel line is actually perfect for smaller outboards. Being a little smaller than the 3/8″ hose, it works great for little kicker motors, and sailboat outboard engines.
What fuel line do you need for a Honda engine?
The general rule of thumb still stands regardless of what manufacturer engine you have! Whether it be Honda, Mercury, Yamaha, Suzuki, Tohatsu, Nissan, or Johnson/Evinrude. Any engine that is above the 115 HP requires you to use a 3/8″ fuel line! The basic functionality of a combustion engine and the fuel demand for the horsepower is the same!
Why is it important to have a fuel line installed?
Going back to the straw theory, having the correct fuel line installed will help ensure the proper fuel consumption for the engine. Thus, keeping up and even prolonging the life of the engine. You don’t want to cause premature failure of the engine or any of the components that are in the fuel system.