Quick Answer: What Size Fuel Line Should I Use

Recommended Size, Based on Horsepower Recommended Fuel Line Size (from the tank to the pump) Engine Output Size (inches) Size (AN) 350 hp or less 5/16 in. -5 350-450 hp 3/8 in. -6 450-650 hp 1/2 in. -8.

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. If the pressure falls as the engine RPM’s go up you need more pump head.

Can a fuel line be too big?

However, in fuel line we are talking about diameters in fractions of inches and line length in multiple feet, so wall friction tends to dominate. Assuming everything is sized correctly, you cannot be too big with a remote pump/regulator set up.

Does size of fuel line matter?

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.

Is 5/16 fuel line big enough?

Registered. What is 5/16 fuel line good up to? It’s good up to about . 3125″, then you’ll have to go largerMar 16, 2007.

How much horsepower can a 6AN fuel line support?

“A rule of thumb; 5/16″ (-5AN) will support up to 300 horsepower, 3/8″ (-6AN) will cover up to 500 HP, and 1/2″ (-8AN) is good to 700HP.” I would assume this is with lower fuel pressures than what these motors useso I would bet on a bit more.

Does fuel pump increase horsepower?

The technical answer is yes; fuel injectors can add 10 extra horsepower at peak. However, for some car owners, that minimal difference does not offset the increased cost and complexity of switching to fuel injectors or upgrading the existing stock fuel injectors.

How much HP can fuel line support?

What is the best material for fuel lines?

The best solution is a material called PTFE. That stands for polytetrafluoroethylene—a plastic material that is best known as Teflon in one specific variation. This material is impervious to the degenerative effects of fuel that also creates a vapor barrier so fuel vapors cannot leak past.

Which fuel line is the return line?

The vapour-return line normally runs from the fuel pump or the fuel filter to the fuel tank. This vapour-return line is connected to a special outlet in the fuel pump. Any vapour that forms in the fuel pump returns to the fuel tank through this line.

What size is an8 fuel line?

Understanding Fuel Line Fittings: Straight Thread (and AN) vs. Tapered Thread AN Size Tube or Hose OD Fitting Thread Size(SAE) -5 5/16” 1/2-20 -6 3/8” 9/16-18 -8 1/2” 3/4-16 -10 5/8” 7/8-14.

Does fuel line size affect pressure?

Every fuel line experiences pressure loss depending on fuel line length, and fuel flow rate. This is why gauges typically use 3/16″ or 1/4″ line size, as they will not affect performance due to pressure loss. Now, we’ll examine how fuel flow rate is affected by fuel pressure drop in a carbureted system.

How much pressure is in a fuel return line?

around 40 PSI in an EFI system, though it could be higher or lower depending upon the application. The return line should only have residual pressure on ita PSI or two caused by the reistance of the fuel line to flow.

Which fuel line is bigger 3/8 or 5 16?

a 3/8 line will carry 44% more fuel than a 5/16 line.

Which is bigger 5/16 fuel line or 3 8?

The Difference Between the Two Sizes 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.

Is 8AN bigger than 6AN?

The AN numbers refer to the tubing OD in sixteenths of an inch. For example, 8AN hose has the same ID as a 1/2″ nominal tube (8/16 = 1/2). This means that 6AN hose will not introduce any appreciable flow restriction in a fuel system designed around 3/8″ OD rigid tubing.

How many GPH is a 700 hp?

Theoretically, the mechanical pump could provide the (approx) 60 gallons per hour that the engine would need, using the formula of 1/2 lb of fuel per horsepower per hour. That’s if you used a quality mechanical pump and not a stocker. So, 700 x . 5 = 350 gal.

How do I know what fuel pump I need?

How do I know what flow rate I need? 500 X 0.5 = 250 lbs./hr. A gallon of fuel weighs 6 lbs. To get gph divide lbs./hr. by 6. 250 lbs./hr. ÷ 6 = 41.67 gph. A liter of fuel weighs about 1.6 lbs. 250 lbs./hr. ÷ 1.6 = 156.25 lph. You need the minimum flow rate at your fuel system’s operating pressure.

How do I know my fuel pump is good?

Usually, a bad or failing fuel pump will produce one or more of the following 8 symptoms that alert the driver of a potential issue. Whining Noise From the Fuel Tank. Difficulty Starting. Engine Sputtering. Stalling at High Temperatures. Loss of Power Under Stress. Car Surging. Low Gas Mileage. Car Will Not Start.

How do I know what size fuel pump I need?

To determine the fuel pump size for a naturally aspirated engine, take the projected horsepower and multiply it by 0.38 to determine liters per hour. If you want to convert that number to gallons, divide the answer by 3.785.

Is fuel line measured ID or OD?

Tubing is OD (outside diameter) and Pipe is ID (inside diameter). 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.

How much HP will a Walbro 450 support?

The 450 (F90000267) and 450 High Pressure (F90000274) will both Support 500+hp on E85 Fuel and 700+ on pump gas applications.