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Fuel Pumps
Ford Ranger
Oldsmobile Ninety-Eight
Ford Explorer Limited

How do you find out if your fuel pump is bad on your 1986 Oldsmobile Ninety-Eight without dropping the gas tank?


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2015-07-15 19:20:19
2015-07-15 19:20:19

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.


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