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intermittent low fuel pressure - Help!
Posted by george (more from george) on Fri, 16 Aug 2013 09:43:17
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98 saab 900SE, 130k miles. Had intermittent stumble on accelaration for a while, and sometimes hard cranking. Then died completely, indy said no fuel pressure, bad pump. Replaced with one from eeuroparts. Still hard starting and almost dies when accelerates. Finally got a fuel pressure gauge splices into fuel line. Interesting... Turn on ignition no pressure, start cranking pump runs to pressure of 20 psi, then stops, engine wont start (no surprise with low pressure). Start with spray starter fluid, fires up and pump runs up to 35 PSI. Drive down the rod, at part throttle pressure good, try to accelerate and pressure immediately drops to 20, back off on throttle and pressure quickly back up to 35-37. Repeat ad nauseum. Hard to think acceleration at 1500-200RPM exceeds the pumping capacity of the fuel pump when it will slowly wind up to higher rpms. Fuel pressure regulator seems most likely culprit, but would love some advice before I take that step.
Thanks for any advice.
posted by 24.137.111...
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