85rotarypower

I have been having bad luck with fuel pumps recently. It seems my last option for a fuel pump is a holley EFI pump. I was wondering if this will work. It puts out 45 PSI. Please respond ASAP.

scathcart

Fuel pumps don't put out a determined pressure, they put out a dtermined flow at a given voltage and a given pressure at the pump head. Chances are, thats your pump's maximum relaible pressure rating?

Most fuel injection pumps are rated to be operated to at least 80 psi... 120 psi is not uncommon either.

Your maximum operating fuel pressure at the rails is:

BASE SETTING + X PSI of Boost. So if you have 40 psi of fuel pressure at the rails with the car not running, but the fuel pump powered, then your maximum fuel pressure at the rails will be 40 PSI + however much boost you're running. If you are running 15 psi of boost, you will be seeing 55 psi at the fuel rails maximum. If you run the engine Naturally aspirated, the most you would be seeing is 40 psi at Wide-open throttle.

The stock fuel pressure regulators on FC's has a base pressure setting of 39-42 psi... pretty close to what you have listed as your "pump output". Now, you also have to keep in mind that up until the fuel pressure regulator in the engine bay, you have about 20 feet of pipe to flow through and one fuel filter... this will easily stack up to an extra 10 psi at the pump head, and put yourself over the safe limit for the pump.

Do you have a part number or link to the pump you're intending to use? I can let you for sure then if the pump will work for you. If not... the answer is simply NO.

85rotarypower

Here is a link: http://www.jegs.com/cgi-bin/ncommerc...00&prmenbr=361

I believe this is the pump that the engine ran on before. I don't know what pump the engine came with, but I believe it was this one since this is the only pump it resembled.

scathcart

That's fine then. The 45 psi listing it gives is not the maximum pressure, just the flow rating at a given pressure and voltage.

The pump will support a second gen rotary turbo just fine. If you can make the pump fit and its within your budget, go ahead and use it.

I would use the larger of the two listed, though, if you ever plan on using any kind of forced induction.

85rotarypower

Thanks. If I absolutely cannot get my pump to work then I will go this route.