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  1. M

    2008 5.3 FF hard starting issue

    I will admit I was a bit confused when I first started this thread, I had done some trouble shooting a few months ago, and stopped. When I made the post I had somewhat forgot what I had all done. When I said fuel pressure regulator I meant purge solenoid on the fuel rail. My mistake. And onto...
  2. M

    2008 5.3 FF hard starting issue

    I should also add, I did some research on these injectors and the oil sending unit. The way I understand it, when you turn key on, fpcm sends a signal to prime fuel system. Once that is done, engine cranking starts to bring oil pressure up and this is what keeps pump running continuous is that...
  3. M

    2008 5.3 FF hard starting issue

    Battery 3 years old. Tested with another battery last night no change. There is no fuel pump relay in this truck. 20 amp fuse under the hood and then down to the fpcm. I have 11 Volts at the module, 11 bolts on signal wire coming from ignition. But after the module there’s no real way to check...
  4. M

    2008 5.3 FF hard starting issue

    Last post for tonight. I went and drove the Tahoe around for about an hour. Came home shut it off with scan tool plugged in and monitoring fuel pressure sensor. After about 15 minutes of sitting pressure was up to 80psi It held there for about 20 minutes and started to drop. After another 10...
  5. M

    2008 5.3 FF hard starting issue

    So a little update. I ended up ordering a New fuel pump control module through the dealer. Had them program and install. Did not fix my issue. I do not have a fuel pressure gauge(yet) however I have a decent Autel scan tool. When I hook into the truck, I get a desired fuel pressure of 58psi...
  6. M

    2008 5.3 FF hard starting issue

    thanks guys, when i get some time i will re check the fuel pressure, its been a while since i played with it, i could be remembering the wrong number there. my biggest concern is the fuel pump not kicking in with key on engine off all the time. i understand it shouldnt do it back to back to...
  7. M

    2008 5.3 FF hard starting issue

    hello everyone. im having a issue with my 08 tahoe. 5.3L flex fuel engine Ill try to list everything ive done or looked into thus far engine sometimes starts just fine, other times it turns over maybe 5 or 6 times before it stumbles and eventually starts idling, other times its like it starts...

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