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?

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.

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.

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


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