Moses,
Got the fuel psi gauge out and performed the fuel psi test and the regulator function test.
I got 15 psi at the throttle body inlet test port, motor at idle. And the regulator function test with the momentary pinch 17 to 20 psi depending on the length of the momentary pinch. Filter changed
I need to give you more info.
The vapor lock never happens while driving down the road and only in the summer time.
My jeep is not a daily drive. It's locked, lifted, geared on different axles and on big tires. I live and wheel AZ. Gets hot here. Imagine wheel in a canyon where your ground speed is never gets above 7mph. Somebody gets hung up on a obstacle and it looks like it could take awhile. You shut the motor off. Say 15 to 20 minutes later the guy that got hung up is free and moving. My jeep starts right up, but travel 5 to 10 yards, the vapor locks starts happening. If I let it sit motor off for 30 to 50 minutes it will start back up and runs. I don't want to be that guy that everybody is waiting on.
The fuel pump does not park I can hear it running. I think that traveling at low speeds in a canyon with little or no air flow across or through the jeep is a problem. I shut the jeep off it falls victim to heat soak. Fuels not circulating and boils sitting in the line. My Vapor lock only happens in the summer.
I can also tell you that the guys in TJ's with the 6 cylinder MPI motors have problem with this too. Not to the extent that I'm having, but it is happening.
The guys running the GM 350 TBI. They got around it by triggering the fuel pump motor off via the diagnostic port, to prime the fuel system. Works slick.
And well, there is the crap fuel that the powers that be have forced upon us.
Anyhow Appreciate and looking forward to your input.
Brett