BlackGMC

iTrader: (31)

Well if you do it without the car running your running off the volts in the battery which mine is at 12.5 (in my case). With the car running my volts are 13.7.

With the truck off and turning on the pump my reads 56psi. With it running and vacuum line removed it is 58psi. Not a big difference but a difference.

oakley6575

iTrader: (5)

Yea I've never thought about the voltage change. Thats a good thing to consider. Sorry for getting off topic btw.

So are you going to try a different regulator to see if your reference diaphragm is bad or is it not enough of a difference to worry about?

BlackGMC

iTrader: (31)

I still have my aeromotive a1000 regulator i can easily swap inplace of the fuelab to see if it a regulator issue. Perhaps this weekend i try, i dunno.

LS1TRUCKGUY

iTrader: (7)

So should the stock fpr function the same way? 1 to 1?? My fuel pressure reads 60psi at idle. It stays around 55-58 under boost...

oakley6575

iTrader: (5)

Return or returnless system?

LS1TRUCKGUY

iTrader: (7)

returnless. i assume it is working properly. didnt see any issues while me and my tuner were logging. im familiear with the return systems, just not so much the returnless. never had to mess with it as of yet.

oakley6575

iTrader: (5)

Returnless systems stay at 58psi and the IFR table compensates for vacuum situations

oakley6575

iTrader: (5)

Hey, don't know what I was thinking last night. Our boost gauges read vacuum in In. HG and not psi. So when it shows -15 on the boost gauge, that is really only 7 psi of vacuum and fuel pressure should be around 51psi. So is your FPR diaphragm doing its job?

Atomic

iTrader: (42)

Bingo. Boost gaugea read boost in psi but vacuum in inches of HG. Yours is working fine.

BlackGMC

iTrader: (31)

Dear lord. I am a retard once again. Thanks for setting me straight. Yep it appears everything is fine.