Truck starts beautifully. I can be driving along for 5-10 minutes just fine, but hit a big bump, and it dies. When it dies, it just won't turn over. We've had to leave it a few times, and whenever we go back to try again, it starts up just fine, runs beautifully for 5-10 minutes, then dies again. Any thoughts?

 

Time to hook up a fuel pressure gage and see what the pressure is and run a leak down test. There is a goor article on how to in the DIY section.

 

Note: Pump pressure is different depending on your fuel system. TBI v CPI.

If it dies when hitting a bump, I suspect electrical problem.

Turn key off then on. Do you hear fuel pump? Should run for two seconds, each 'key > on'.

If so, bad connection to pump more likely.

Do you have a tach? Does needle bounce while cranking?

 

alot of what is posted on these it dies after awhile always seems to follow the fuel pump but out side of that..... what other if any symptoms have you noticed? skippin idle any odors.. lack of power loss of mpg..

 

'won't turn over' - are you saying the starter motor is not engaging / the car is electrically dead or is it just that the motor doesn't start because e.g. there is no spark/fuel?

My own vehicle once refused to turn over because the fan belt was stuck on a broken alternator - so evidently anything the fan belt runs over could stop an engine from turning over as well.

But what would run 'only when it is cold'- what could start to fail as it warms up and require a 'bump' to stop working?