Question about Buick LeSabre

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Facts, please: '98 Buick LeSabre; 58,000 miles; no other engine problems or problems of any kind; no accidents Fuel pump first went bad? April 2008 What were symptoms? engine wouldn't start--after sitting a long time, short time or it doesn't matter? Does it turn over and not catch? What does 'it doesn't start' sound like? Doesn't seem to matter how long although the time duration has so far been anywhere from couple of hour to couple of days. cranks normally but just no fuel getting to spark plugs--cylinders & plugs are dry. What exactly did they do? towed to shop, diagnosed and replaced with new pump Subsequent problems? June 2008--same thing Fix? same as before; since then every month or two the same thing and the same repair--always a new pump; when pump #5 failed, I changed the fuel filter and spark plugs before having it towed in--new filter and plugs changed nothing--no fuel getting to the plugs; towed in an pump replaced; pump #6 failed in September, 2009; after it was towed in, it started immediately, they kept it for a week and every day it started multiple times with no problem; electrical and grounding connections checked and no problems located; Current problem? October 31 same failure; in location of pump I repeatedly whacked the gas tank with rubber mallet and vertically bounced the car as much as I could; did this procedure daily for 3 days--no change. Shop says they have checked mfgr advisories without locating anything pertinent. Towed it in on 11/2 and haven't heard anything from the shop since then. Symptom? same as before What do they think it is? they seem to have no ideas except that the pump is the problem and it needs replacement. Since the third replacement, I have been diligent about not letting the fuel level get below 1/2 full. Now the fuel pump worked two weeks and is gone again. The man who towed the car, tried starting the engine and agreed that he could not hear the fuel pump at all.

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  • charcoalkk07 Nov 18, 2009

    I like Ron's answer; would like to see if there are any ideas. Frustration here is at a HIGH level since there seems to be no solution that the mechanic can find.

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  • Master
  • 1,615 Answers

Fisrt thing is having repeated fuel pump failures is real common. Several things can cause this. Chevy trucks recommend replacing the fuel pump harness also when replacing the pump or this can happen. Weak old wires can cause a voltage issue causing the pump to burn up. Also alot of fuel tanks have a coating that can fall apart and be abrasive to the pump causing failure. You can search,,, Repeat fuel pump failures.. and find this info easily. Chrysler has issues for the 98 99 years for their Cherakee fuel tanks requiring replacing the tank also with a new pump.
Hope this info enlightens you.

Posted on Nov 18, 2009

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  • Buick Master
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I know you don`t want questions,but I want no answers,this is for you to ask yourself,and the techs.Has anyone bench checked these fuel pumps to see that they are actually bad?Is there voltage at the pump,when key is turned on?Are all these pumps been the same brand?purchased at the same place?Was the tank inspected for a contaminate,or trash in the tank?If all the pumps are correct applications ,for the car,and are actually testing bad on the bench,all of them,then I would change the fuel pump relay,and install a new fuel pump harness all the way back to the pump.Have the alternator checked for a c voltage out put.A alternator actually produces a c voltage,and has a rectifier ,that has diodes to turn the a c voltage into d c voltage before the out put.If there is a diode that has gone out,in the alternator,it will produce some a c voltage,not much,but enough to cause a small motor to burn out in a short time.If gone undetected,if the alternator diode gets worse,or starts allowing voltage to go the other way for a while,it while finally destroy the rectifier,and produce more a c voltage,and everything will be effected.The starter for one,because the a c voltage will finally charge the battery with the a c voltage,I have never seen a battery fully charged with ac voltage,and I don` t think I will,cause it would most likely blow up before that.Maybe this was helpful,and maybe not,but there it is,take it or leave it.Just trying to help out if I can.

Posted on Nov 18, 2009

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