will not start after you drive it for a while

[okiemudslinger]

My son's 95 1500 K 5.7 TBI, normally the truck starts right up the first time of the day but lets say you drive across town and stop to get some at the store and you come back out with in a half hour the truck sometimes will not start but not all the time. We did put a new fuel pump in which fix the shutting off while driving problem but it still has the will not start when warm ( some times ) problem. i need some help please.

thanks for you help.

 

[Ironhead]

First thing I would do to diagnose this is to get hold of a fuel pressure tester, and check for pressure at the engine.

 

[michael hurd]

Well, it's either ignition or fuel. If the injectors are spraying ( can take off the breather lid and check when cranking hot and will not start ) then it is ignition.

Perhaps the coil is breaking down when it gets hot, or the ignition module has an intermittent connection.

 

[matt sorrentino]

I had the same problem on mine. Replaced the starter. Issue solved. Service the starter wires too sometime they break and they might short

 

[superdave]

When you say "won't start" do you mean that it will crank but not fire up, or that it will not crank over at all?

 

[jkeaton]

When you say "won't start" do you mean that it will crank but not fire up, or that it will not crank over at all?

That's what I'm wondering. Wont turn over or turns over and wont start.

 

[okiemudslinger]

Will turn over just will not start,
I did remove the breather and looked at the injectors did not see any fuel spray out

 

[okiemudslinger]

I going to charge the battery and change the fuel filter tonight and see if that helps (he ran the battery down yesterday when it would not start).

 

[jkeaton]

Can a TBI vapor lock?

 

[okiemudslinger]

ok so I charged the battery and changed the fuel filter, truck starts and I drove it to town and back shut it off it starts ( great it's fixed?) wrong try to restart again no start