GM techs help please

[Warlock28SXT]

Just wanted to say thanks for all the input on this. We went through and checked/did the suggested ideas to no avail. He has a chiltons book also so we went througha bunch of other things as well. Still no luck. Now after the truck sat for a few days with the temps climbing here it started. Oh so strange. Maybe it was a condinsation issue or possibly it was just flooded from when he first tried to start it, slow crank weak battery? I don't know exactly. We will see if it keeps running. I think I'm going to tell him to have it scanned anyway to see if it has any codes to possibly shed some light on this if it happens again.
Thanks again
Jason

 

[mrv8outboard]

it is fuel pressure. just not enough when it is cold. i have had a few like this. use a fuel pressure and verify its accuracy. the pulse limiter is also a possible culprit. the easiest way to test this is too pour a little gas down the throttle body and it starts and dies but once you do it a few times it will stay running because as it warms up it needs less fuel.

 

[Warlock28SXT]

it is fuel pressure. just not enough when it is cold. i have had a few like this. use a fuel pressure and verify its accuracy. the pulse limiter is also a possible culprit. the easiest way to test this is too pour a little gas down the throttle body and it starts and dies but once you do it a few times it will stay running because as it warms up it needs less fuel.

We never checked fuel pressure just that we had fuel at the rail, no fuel pressure gauge. I sprayed starting fliud down the TB with no luck. Still not 100% sure what it was. Jason