Question about 1995 Buick LeSabre

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My 94 LeSabre has a about 34 pounds of preasure in the fuel line by the engine and as soon as I step on the gas it drops down to 10 pounds. My mechanic thought it might be the diaphram above the fuel pump in the gas tank not working properly and told me to replace it with just a rubber hose. I took the tank out and this has been done alredy. Any other ideas that might be causing my problem of lacking gas line preasure to the motor?

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3 things it could be 1 the fuel pump itself 2 is the fuel filter could be restricted 3 is a bad fuel pressure regulator if the three have been tested and are good let me know and i will take you thru some more

Posted on Feb 20, 2009

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This truck is fuel injected, the problem sounds like a weak fuelpump, it runs when you pour gas into it until that gas runs out, the first thing is to test the fuel preasure, if the pump is weak it may run with gas poured into it but wont idle, also a common problem is the coolant temp sensor and the ground wires to thermostat housing bolt but i wont bet its the pump inside the fuel tank, if you put a fuel gauge on it there should be at least 55-61 psi if its a few pounds lower it can cause problems, you have everything else and it runs with gas poured so its a fuel problem check the preasure, theres a valve up top on the fuel line to connect a fuel gauge to it, start there hope this is helpful.

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Waths the fuel preasure on 99 gmc sierra


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  • A fuel system that drops more than 34 kPa (5 psi) in 10 minutes has a leak
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    No this is normal. As an engine wears then oil preasure will be less this is not due to a weak oil pump but wear in crank shaft bearing's. When an engine is new and bearings are tight then oil preasure wont fall a lot from reved up to idle as the engine wear's oil escapes quicker from the crank shaft bearings. Reved up oil preasure increases idle it drops off. If the oil light stays out then their is enough preasure to lubricate the engine. In fact in an older engine high oil preasure is a worse complaint as this means the oil system is clogging. All is ok with your pump. If the oil preasure is moving up and down at constant rev.'s then the oil pump is faulty. Hope this put's your mind to rest.

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