Check your starter. A bad starter will not crank when hot. How to Test a Starter Solenoid: 4 Steps - wikiHow

Check to see if the water pump is working. You can tell if the water pump is working by removing the radiator cap with the engine COLD, start it up keep a bucket under the radiator it can get a lil messy. run it til the thermostat opens , you should see the water start flowing thru the system. if you dont & it starts to over heat then your thermostat is not opening. once the engine gets hot put the cap back on before you shut it off . if you shut it off with the cap openned anti freeze will fly out , so be careful.

 

I should have been more clear it turns over but won't Keep running

 

Have you cleaned out throttle body or maf sensor thoses always help.

 

I have

 

If you're running at almost three quarter temp gauge you may want to fix that problem first because a thermostat or thermo-sensor etc. may have an impact on your hot start issue.

 

Put fuel pressure gauge on it you know it acts up and won't start. Do a search for your temp gauge reading. You will find that interesting . Is the gauge at cold after it sits all night?

 

Thanks will do so and keep you posted, I was told if the thermostat was change it would run high, not sure how true that is or if it was changed

 

After it sits all night the gauge is at cold.

 

The temp gauge seems normal then. The fuel pressure test cold vs hot (when it will not start) will rule out or help discover a fueling problem. Were not supposed to run out of gas with these efi setup motors its not good for them.

 

Since I've had it I've never.... maybe previous owner did

 

Naw just saying. The less fuel in the tank the hotter the pumps operating temperature. The fuel cools it.

 

so left the truck with the mechanic and it acted up with them and they still cant find the issue. not sure what to do

 

resurrecting an old thread, im having the same probem, maybe slightly worse, the truck has died on me twice at a light... my fuel pump is new, maf is 7 months old as well as map sensor and spark plugs... im not getting any codes.

OP ever find a fix to this_?

 

it ended up being my fuse box in need of a good cleaning..

 

Hey Guys,

Just wondering if you can confirm my suspicion. I've been chasing this same problem with my 2005 Colorado. Usually after a steep, slow off-road climb and definitely correlates to a lower fuel level. I've also had some "system lean" and "Misfire" codes.

I've tested my fuel pressure. I forgot get my the exact spec is but let's say it's 70psi ignition on motor off. I have 60psi, however when the motor is running the pressure does come up to spec.

I've changed most everything else. 02 sensors, fuel pressure regulator, MAF, plugs and coils recently.

Everything seems to be pointing to fuel pump but want to see if there's anything else I should try or look at first.

Thanks!