Fuel pressure question

[Don W.]

I’ve just finished installing gauges. Fuel pressure is 40 with the key on or at idle. Made quick run up the street. Fuel pres follows boost but greater. By the time I hit 10-12 lbs boost I’ve got 60 psi FP.

Considering that I’ve got an Ultimate coming is this FP OK? I’d rather not have to spring for the Walbro and AFPR right now. But then again I don’t want to lose the motor either.

Don

 

[SY2932]

Re: Fuel pressure question

That fuel pressure is a little on the high side, you will just run pig rich and belch out black smoke when you get on it. The cardinal rule for boost vs fuel pressue is that you want fuel pressure to increase one psi per pound of boost. Hence, if you have 40 psi at idle, you would want to see 50 psi of fuel pressure at 10 pounds of boost.

Installing an Ultimate chip before you even have the "basic" mods like a fuel pump and AFPR is kinda like putting the cart before the horse...

 

[Don W.]

Re: Fuel pressure question

That fuel pressure is a little on the high side, you will just run pig rich and belch out black smoke when you get on it. The cardinal rule for boost vs fuel pressue is that you want fuel pressure to increase one psi per pound of boost. Hence, if you have 40 psi at idle, you would want to see 50 psi of fuel pressure at 10 pounds of boost.

Installing an Ultimate chip before you even have the "basic" mods like a fuel pump and AFPR is kinda like putting the cart before the horse...

Yea, I knew about the 1 for 1 fuel pres., and no it dosen't smoke at FT. Hmmm... Maybe I'll go with the AFPR first and see if my stock FP can keep up. I'm not to excited about taking out the fuel tank.

Thanks,

Don