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Hey everyone

I have been trying to track down a P0171 lean code for quite a while now. Today I adjusted the valves and checked fuel pressure. Adjusting the valves went fine, but when I tested fuel pressure, with regulator vacuum disconnected I was seeing 39 psi and with the regulator vacuum connected I was seeing 29 psi at idle and 37 psi under load. So, it seems that the regulator is operating correctly and lowering fuel pressure at idle and increasing pressure during load. And the low fuel pressure most likely means a restriction in the system. I have already changed the fuel filter, but maybe the aftermarket filter doesn't allow enough pressure through? It doesn't seem like fuel pumps go bad very often. So, I'm kind of out of ideas on what the issue could be.

(98 Integra RS)
 
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