Aeromotive AFPR Setting Issues

[GPTourer]

Okay, so I was all hyped thinking my car was finally set up decently and I didn't need any more important fuel mods. But no... I set my Aeromotive AFPR to 43.5 or so with the vacuum source disconnected and all seemed well. But one morning I go to get into the car and the idle is rough and its barely running. I check the fuel pressure and all of a sudden its down like 15 psi. I adjust it, drive around all seems fine, a few days later it starts sputtering coming up to lights, I get out to check and now the fuel pressure is about 10 psi too high. I adjust drive and repeat. Yes, I am tightening down the washer, no it is not bolted to the engine - but the fuel pressure refuses to stay dialed in. What could be the problem?

I realized I still have the stock wiring on my high pressure Extreme FP, and I will rewire it soon, but it should still be able to maintain the correct pressure at idle right?

 

[Lordpaxin]

do you have the vac line hooked up now?

 

[GPTourer]

Yes. I remove it to adjust it then put it back and drive.

 

[Lordpaxin]

Perhaps you have electrical problems. Next time it shows LOW psi check the battery voltage too. if your voltage sags your pump wouldnt pump at max psi. just a thought.

 

[oldman]

It's always possible that you may have a defective regulator or a inconsistent fuel pump.

 

[GPTourer]

At idle, I'm only getting like 12 to 12.5 volts. I have been noticing my lights diming at idle and the fuel pump whine oscillating with the turn signals. I have a stock alternator, and a used Optima Red top. hmmmm... thanks.

 

[oldman]

Rewire the pump and see what happen.

 

[Lordpaxin]

You definatly have Low voltage at idle.
Check your battery connections with a volt meter, not saying thats your fix, but getting oyur voltage up is a start.

clean the terminals and the lugs and get a good shiny surface then bolt them back up.
if voltage is still low, might be alt.

 

[GPTourer]

I had the alternator and battery checked, charging was fine.
So then I had the fuel pump rewired straight off the battery and now that seems to have done the trick.

Thanks for all the help everyone.