How do I know what size fuel pump I need?

Fuel Pump Specs Defined

  1. 500 X 0.5 = 250 lbs./hr. A gallon of fuel weighs 6 lbs. To get gph divide lbs./hr. by 6.
  2. 250 lbs./hr. ÷ 6 = 41.67 gph. A liter of fuel weighs about 1.6 lbs. To get lph divide lbs./hr.
  3. 250 lbs./hr. ÷ 1.6 = 156.25 lph. You need the minimum flow rate at your fuel system’s operating pressure.

How much fuel pressure do I need?

Required fuel pressure can vary depending on your vehicle’s engine and fuel system. Carbureted engines may require as little as 28 kPa (4 PSI), while modern multipoint fuel injected high-performance engines can require as much as 414 kPa (60 PSI).

How much is a E85 fuel pump?

250-gph
But because E85 requires much more fuel volume, you’ll also need to upgrade your fuel system too. Get a 250-gph fuel pump, an E85-approved regulator, and -10 tank-to-regulator and -8 regulator-to-carb fuel lines in synthetic rubber, preferably braided.

What happens if I put a bigger fuel pump?

An upgraded fuel pump may move so much fuel, the factory regulator cannot bleed off the pressure fast enough. This leads to higher than desired fuel pressures which means the injectors are spraying more fuel than intended. The consequence is an overly rich air to fuel ratio and a poorly running engine.

What psi should a high pressure fuel pump be?

Typically, a high-pressure GDI pump creates about 2,000 psi. The sensor and the PCM help regulate the pressure to keep the fuel pressure at an ideal level for the engine in real time.

How do you size a fuel pump and injector?

Calculating Injector Size Injectors are normally rated in cubic centimeters (cc’s) per minute. Take the calculated fuel pump size in liters and divide the number by 16.67. If you want this number in pounds per minute, divide the cc’s per minute by 10.5. Fitment and drive must also be considered.

How much HP will a Walbro 450 support on E85?

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

How much horsepower will a Walbro 450 support?

The conservative horsepower rating of this pump is that this pump can support 800 HP on 12 volts and up to 950 HP on 13.5 volts.