Fuel pumps are sized to feed your system with enough fuel to optimize engine performance.
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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. 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.
Can fuel line be too big?
Registered. Actually you can have too big a fuel line…if the line is too big and your car accelerates hard yet you don’t have a massive fuel pump, you will have the additional weight of the fuel in the line pushing back and fighting the fuel pump which can cause cavitation.
How do I know what size fuel hose I need?
Place the top of a 1/4-inch wrench with an open end over the fuel line. Slide it carefully over the line so that it fits snugly against the tubing. Read the wrench’s measurements to determine the diameter of the fuel line. Place a caliper over the fuel line if the wrench did not give an accurate reading.
Does diameter 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.
Does fuel line size affect pressure?
Things like line bends and diameter, filter quality, and injector size can affect the fuel system pressure. Mismatching the rest of the fuel system components with the fuel pump can either increase or decrease fuel system pressure and immediately cause a decrease in overall performance.
CONTINUE READING BELOW
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 size fuel line do I need for a carburetor?
Anything above that can overpower the needle and seat and flood the carburetor. Most stock applications came with 5/16-inch fuel line, but for many street vehicles and mild race applications 3/8-inch (AN 6) fuel line is a good upgrade.
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 goes to the primer bulb?
For this 2-stroke engine carburetor design, the primer bulb is built on top of the assembly. The bulb pulls fuel through the filtered fuel line and into the carburetor and then it also pushes it out of the carburetor and out the unfiltered return line.
What size is fuel line hose?
For fuel injection hose, sizes range from 3/8 inch to 3 ½ inches. Choosing sizes depends on the size of fuel injectors. The common sizes are 5/16, 5/8, 3/8, 1/2, and 3/4 inches.
What an IS 3/8 fuel line?
The original Fast Flow Fuel/Cooling Line. Suitable for jet-skis, snowmobiles, go-karts, ATVs, motorcycles, and other motor sports applications that require a 3/8″ line.
What is the ID of 3/8 fuel line?
Part Number: 555-15996. 3/8 in. I.D.
Do I need a return fuel line?
You don’t need it with a mechanical pump. Mechanical pumps supply fuel based on RPM, and so long as you’re not running a big hipo mechanical pump, you’re fine without a return. Edit: Keep in mind that the pump doesn’t create pressure, resistance to flow does.
What size is metal fuel line?
Typically, these 1/4″ and 5/16″ line sizes are in use for low flow or OEM systems, but are commonly used in high performance applications for pressure gauges as well as plumbing between the Regulator and Intake Manifold.
How much horsepower will 5/16 fuel line support?
If you’re just cruising around with a carbed SBC, you’ll probably be fine with a 5/16″ line up to about 500 HP because you’ll never tax the system enough to starve the motor of fuel.
How many Lph do you need for 500hp?
Making the Choice
| Fuel Pump Free Flow | Carbureted Engine | Fuel Injected Engine |
|---|---|---|
| 30 gph/114 lph | 350 hp | 300 hp |
| 40 gph/155 lph | 450 hp | 400 hp |
| 50 gph/190 lph | 600 hp | 500 hp |
| 67 gph/255 lph | 750 hp | 650 hp |
What is normal fuel pressure?
It is between 35 and 65 pounds per square inch (psi) on most vehicles.
What psi should my fuel pressure be?
Fuel pressure for most vehicles should stay in a 5- to 10-psi range.
Is fuel return line high pressure?
The return syle regulator normally holds the pressure in the feed line and the fuel rails at or near the set pressure… around 40 PSI in an EFI system, though it could be higher or lower depending upon the application.
Does a fuel injection return line have pressure?
The return only sees about 5 PSI of fuel flow. So no reason for it to be bigger. If your regulator is in the EFI unit and not back at the tank, then there should be no need for a larger return line as there should be minimum flow/pressure in the line.
What is the purpose of a fuel return line?
The fuel return line returns fuel to the gas tank. Fuel injection systems need to maintain a high pressure supply to the injectors. The excess is routed back to the tank.
How much HP is 6AN good for?
“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.”
What size is motorcycle fuel line?
5.5mm Genuine Honda fuel line and filter kit. High quality Genuine Honda fuel line with clear fuel filter for many applications. This is the stock size fuel line that was used on many of the 60’s-80’s Honda twins and singles and fours including the CB160, CB175, CB350K, CB/CL450K, CB550 and CB750.
What tubing is good for gasoline?
It has exceptional resistance to most gasoline, oils, kerosene, and other petroleum-based chemicals, making PU tubing and hose an ideal choice for fuel lines (although additives in today’s gasoline and petroleum products warrant field testing).
Is vinyl tubing good for fuel line?
Tygon fuel hose. Small engines on your lawnmower, ATV or motorcycle use a gas-resistant vinyl tubing called Tygon. … Standard rubber vacuum or heater hose should never be used in fuel applications.
Is braided fuel line better?
Braided Lines
Braided hose provides better heat dissipation and better flow, which is important when choosing performance car parts. Additionally, braided lines are able to withstand more pressure than rubber lines. When you need a flexible hose, you may not be able to use metal.
Which line goes to the carburetor?
How to tell where to correctly connect what fuel line on a weed eater …
What lines or pipes connect the engine to the fuel tank?
The fuel line typically consists of rigid metal pipes, with flexible rubber or plastic hoses running from the pipes to the tank and the fuel pump , and from the pump to the carburettor . The flexibility of the hoses allows some movement between these different components.
How do you hook up a fuel line to a carburetor?
Fuel Line Connection – YouTube
What is the ID of 5/16 fuel line?
Size: 5/16″ I.D. x 9/16″ O.D. Working Pressure: 50 P.S.I.
What size hose is 10 an?
Russell Performance Technical Support
| AN Size | Metal Tube O.D. | Thread Size |
|---|---|---|
| -6 AN | 3/8″ | 9/16″ – 18 SAE |
| -8 AN | 1/2″ | 3/4″ – 16 SAE |
| -10 AN | 5/8″ | 7/8″ – 14 SAE |
| -12 AN | 3/4″ | 1-1/16″ – 12 SAE |
What size is #10 fuel line?
A fuel hose（https://en.wikipedia.org/wiki/Fuel_line） is a hose used to bring fuel from one point in a vehicle to another or from a storage tank to a vehicle.
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Fuel Hose Sizes.
| AN Size | Tube or Hose OD | Tube or Hose ID |
|---|---|---|
| -10 | 5/8” | .484” |
| -12 | 3/4” | .609” |
What is the OD of 1/4 fuel line?
Universal Fuel Line – 1/4″ ID x 3/8″ OD, Sold by the Foot
| Inside Diameter | 1/4 Inch |
|---|---|
| Outside Diameter | 3/8 Inch |
| Type | Fuel Tank Line |
What kind of hose can you use for diesel?
The American Boat &, Yacht Council (ABYC) recommends the Type B1 fuel hose for diesel-based applications. The Type A1 hose is the best option for gasoline supply. This hose is less permeable, highly durable, heat resistant and does not collapse under high pressure or vacuum.
What is 3/8 of a gas tank?
Fuel gauge reading in inches in respect of gallon’s of fuel in the fuel tank. If fuel tank capacity is 275 gallons then 3/8 of a fuel tank is 275*3/8=102 gallons approximately. It means the tank is 37.5% full. 3/8 is just being used to express how full the tank is in fraction of totally full.
Does an electric fuel pump need a return line?
A return, while not necessary, is certainly nice to have as it makes the fuel pump’s life much easier. It keeps the fuel pump from fighting dead head pressure and that will make the pump ultimately last longer.
How do you plumb in a fuel return line?
How To Properly Add A Fuel Return Line for EFI Installation – YouTube
Does a carburetor need a fuel pump?
A fuel pump is not necessarily required for the engine to function. The low-pressure fuel needed by a carbureted engine can be supplied simply by mounting the tank higher than the carburetor and allowing fuel to feed with gravity.
What size is outboard fuel line?
What Size Fuel Line To Use For An Outboard, 5/16″ or 3/8″? 5/16″ fuel line can be used in up to a 115 HP outboard engine. Anything above that has to be a 3/8″ fuel line.
What size is 4AN fuel line?
The Good News
| Male Thread Size | AN Size* | Hose ID** |
|---|---|---|
| 3/8-24 | 3AN | 0.13″ ** |
| 7/16-20 | 4AN | 0.22″ |
| 9/16-18 | 6AN | 0.34″ |
| 3/4-16 | 8AN | 0.44″ |