Quote:
Originally Posted by kalyn
ok here it goes...
cold start fuel pressure 52-53 psi.
engine running fuel pressure 52-54 psi. (cold/warm/hot)
have not checked running on road pressure (hose not long enough)
after shutting off - leak down slow but over night goes to 0 psi.
Disconnected line after fuel filter to connect pressure tester there. Cycling key to on and off yields same results 52-54 psi. Leak down rate fairly quick initially (drops approx. 1 psi. every 30-45 sec.) Once it drops to 50 psi. leak down rate slows a bit. After about 15 min. pressure shows 32 psi. Thanks for your help. I feel like I'm getting somewhere now.
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If then direct fuel pressure at fuel filter is no 85-105 lbs the pump is bad.
You need full pressure over 10 lbs of running pressure to for the pressure regulator to hold running pressure.
Also a lot of fuel pumps fade out after running on the road when tot.