Question about 1991 Buick Park Avenue

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My 1991 park avenue starts and seems to run fine for maybe twenty miles, and then will begin to starve for fuel, as it begins to diesel very bad, and only run smooth at very light acceleration. if i pull over and turn engine off for 5 or 10 min. it will run fine again for a while and then do the same thing. i have changed the fuel filter but it didn't help. am thinking it could be a bad fuel pump relay.hopefully not the fuel pump. what do you think?

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Hi, it could well be the pump but give this a try, next time you use the car leave the fuel filler cap off just for this test then see if the car cuts out or not, im saying this because the problem could be an airlock in the tank, if the breather has become blocked then this could be causing the fuel not to pump correctly so just for one journey leave the filler cap off but dont lose it then have a drive and see if it cuts out.

the thing is with the pump you would have the problem all the time it wouldnt just start after say 20miles the fault would be their constant thats why im thinking air lock.

let me know what happens ok

when the car is hot do you have any troubles starting it let me know

Posted on Jul 29, 2010

  • worksalot619 Jul 29, 2010

    i will try your fuel cap solution, but i am thinking i tried that once before , buy not sure. to answer your question, i have no problem with the car ever starting.

  • paul proctor Jul 29, 2010

    if it start fine when hot then that rules out a heat related issue,
    Have you tried buying a fuel line cleaner, you can buy these from most filling stations and car spares shops. A good brand to buy is call Red X just make sure you buy correct type ie diesel and not petrol then just follow the instruction on the back of bottle, how it will tell you pour this into a full tank of fuel now dont do this pour it into half a tank of fuel then do the following
    1, for first 15 to 20 min drive normal
    2 for next 15 to 20 min drive a bit harder pulling away faster and taking the revs up higher
    3 then drive normal for last 15 min
    doing this will ensure all the fuel lines and pump and injectors are cleaned properly under pressure, most people who have the problem your having usually find out they have picked up some dirty fuel thats causing them problems and after using this product they no longer have any problems.

    if it solves you problem then it would be a good idea to use this product every 6 to 8 weeks just to ensure it keeps your engine running at its best, it also improves mpg and will ensure all you fuel lines are clean and free from muck

    give the above a try and you should find you will have no further problems

    let me know how you get on ok



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