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fuel pump or regulator causing this?
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Question
Mattt
2001 Suburban w/ 5.3....I replaced the fuel pump a few months back, just the pump not the complete module. I bought the pump in an ACDelco box off Ebay and the part # comes up as a ACDelco-Mexico part # BGV00250
Recently the Sub has been hard starting after sitting for a while. I put a pressure gauge on the schraeder valve and my fuel pressure is low....like 40 psi. At least once on a cold crank, key on, engine off it only primed(~2 sec) to 30 psi. It always starts but generally not without a long crank or cycling the key on-off-on-off-on which is giving me a longer prime.
I didn't replace the regulator when the new fuel pump went in. I'm trying to avoid just throwing parts at this problem and looking for a little help which way to go.
I have little faith in the Ebay pump now but I'm not sure that is the problem. The problem could just as easily be the regulator. Is there a way to discern what is causing the low pressure....regulator or pump?
Thank you in advance.
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