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check air filter, might be plugged, [dirty so engine is starving for air.] check fuel lines & filters, dirt blockage need replaceing, check for fuel leaks in lines etc, uses fuel & then sucks air causing it to stop, listen to see if fuel pump is running properly & not stuttering could be short in it's wiring
this could be a bad fuel pump that has a problem from sitting over night or when it cools down enough.the armature in the pump may be worn and when its cold it has a hard time turning the pump because of it being worn and when it gets warmed up enough the clearance is closer than when cold and works fine.
It sounds like the sendary or low volume pump is not working when cold ! Its also possible that the primary pump is doing the same thing ! There are updates on parts to move or consolidate both pumps ! Basically when you first start your truck your running on the fuel thats already in the fuel housing and then it runs out or low due to insuffecient supply !
Change the fuel filter. It is usually located passenger side along the frame rail ahead of the rear tire. You're right, it's starving for gas & because of this your fuel line is heating up & causing vapor lock. This is why your car won't start when hot. Good luck!
Has Neon do same, I ran fuel at low level, on hot day, ran engine until it started to act up & threw a fuel pressure gauge on it. Was at approx 5 psi. Cold next morning, 48-50 psi. Always hot day about 30-40 miles into work in morning, o.k. Sit in hot sun all day & would happen 3-4 times on way home. Sit and let cool, 20 minutes or so & go again for a while. Cool day, no problem. Change pump I would.
Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.
most likelly when your fuel pump gets hot it looses the pressure going to engine replace fuel filter and if this dont help then have the fuel pressure test done when problem is present
and if not good replace fuel pump