Jump to content

Brett77

Members
  • Posts

    4
  • Joined

  • Last visited

  1. Thanks Moses, I really appreciate your feed back. And the attached prints have helped out a bunch. I was missing a couple of the pages in the manual I have. The complete set of the fuel pump circuit that you sent has helped a bunch. Thanks again for your Help. Brett
  2. Hey Moses, Liked the suggestion on the grade of parts and fuel psi rating. You asked why I wanted to trigger the fuel pump to run. When you turn the ignition key to the on position ( not starting the motor). The fuel pump will run for ~3 seconds and then the fuel pump parks. My question is. What parks the fuel pump? I was under the impression that. Key on (no crank). The fuel pump runs for ~3 second and parks. ECU does not see the motor crank (via Crank sensor. There’s not cam sensor on my motor) ECU says motors not cranking there’s a problem park the fuel pump. So if this is true = Doing the by-pass solenoid valve from the supply to return and using a ignition key turn will only run the fuel pump for ~3 srconds a key turn. The ECU will park the pump because the crank shaft is not turning. Straight up. This really is not what I’m looking for. So with all that being said. I was hoping you might know somebody that has the Diagnostic connectors (cause there’s 2) pin out. And maybe you do?? I have posted this on 4 jeep forums, 1 international off road forum, 2 Overland forums and nobody known’s answer. Yesterday I had a bubby had me a Haynes manual, the YJ series published 1992. With electrical drawings. I was able to figure out with an ohm meter and the drawings what pin triggers the fuel pump. I was really hoping you could confirm it before I put power to it. I got scared. I have been a lurker for awhile, really enjoy 4wd Mechinix Magazine Once again appreciate your time and input Brett
  3. 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
  4. Greetings, I have a 89 yj with the 2.5L TBI motor. And on hot days when I shut the motor off the fuel system will some times vapor lock. Iam looking for the pin out of the diagnostic connector on the passenger side fender under the hood. My hopes are that there is a way to turn on the fuel pump and keep it on to re prime the fuel system by jumping a wire in the diagnostic connector (Molex connector). Then once the fuel system has been primed remove the jump and down the road I go. I have several friends that have done this with a GM 350 tbi motor and it works pretty darn good. Thanks you in advance for your help. Brett77
×
×
  • Create New...