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How do you find out if your fuel pump is bad on your 1986 Oldsmobile Ninety-Eight without dropping the gas tank?
Hey John==At the battery there is a tan or brown wire that if you touch it to the pos battery post should make the pump run. This bypasses the relay. GoodluckJoe
Also, you can put a fuel pressure tester on the injector fuel rail - there is a connector that looks like an air pressure valve.
Turn on the key and the pump should run. Pressure s/b typically arount 36 - 45 lbs. The motor will run with pressure down to about 28 - 30 lbs although maybe not very well.
Below about 24 lbs it will simply not run at all.
Sometimes when a pump goes it quits entirely, and sometimes it just gets tired but doesn't stop completely.
Vic M.
What else can I help you with?
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