With the key off how much fuel pressure drop if any is acceptable?

My car (87 IROC with SLP T-Ram manifold)is loosing 10 PSI of fuel pressure every fifteen minutes. I did two timed test, one with injectors plugged in and one with them uplugged with the same results. BTW, I had to delete the cold start injector so this is not a factor.

I just had the injectors cleaned and tested, so could it be my piece of ***** TPIS regulator?

Any help will be appreciated.



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87 IROC -
ZZ4 350
SLP T-Ram,1"3/4 SLP headers, Cat back, Hotch-kis, MSD, Iebach etc.

 

DLP,

If you suspect the regulator, pinch off the fuel return line from the regulator to the tank as soon as possible after shutting off the fuel pump. If the rate of pressure drop changes, the regulator is leaking back to the tank.

Incidentally, I hope you changed the fuel filter before installing the cleaned injectors. Any debris allowed to reach either the regulator and/or injectors can ruin a freshly cleaned set of injectors or contaminate the regulator valve and seat so that pressure drops quickly. I'm not aware of how/who cleaned your injectors, but Cruzin' Performance recommends a fresh filter whenever installing new/cleaned injectors.

By comparison, my TA holds pressure for a couple of weeks after I've shut it off.

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Later,
Vader
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"Make Me Bad"
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