Having problems with your 1996 GMC Sierra ?

1997 GMC K1500 4x4 5.7 ex.cab SFI injection system

\015 Fuel pump died replaced it truck ran poorly afterwards. Had a prussuer test done pump determend pump was no good. Put in another ran good for 2 days started running poorly hard to start no power. 2nd fuel pump. So i figure another bad new fuel pump wow changed it put in a third brand new fuel pump. Still will not eve start now. I had it tuned up 2 months ago new plugs rotor, cap, etc. put in a new fuel filter made sure it is on proper checked all connections for leaks. this cannot be a fuel pump problem now. no problem with the elctrical i figure i have great spark on ignition tester. I can hear the fuel pump prime when i turn the key. but when i went and checked the fuel port i had no pressure. When it is being cranked gas sews out of the test port. Also i dont if this is comon cause i used to turn my keyand go. but when i have someone turn the key and i listen at the gas tank whn the key is shut off i hear gs spraying back into the gas tank. So i am open for opinions.\015\012\015\012gmc 2500 5.7 with sfi occasionally hard to start has to turn over 2-3 times \015\012fuel preasure good but falls when engine cut off\015\012replaced sfi with mfi new fuel filter checked 2 plugs clean and firing\015 Posted / edited by AnonymousUser on : 26-06-2017

Answers :

Hey there boatright33,

A few things things immediately come to mind.

There may be a problem with the engine controller. You could check the\015\012ODBII onboard diagnostics. Auto part stores will usually do this for\015\012you at no cost.

When you pulled the ones that were/went bad, how did the filters look? Could there be particulate matter still in the tank causing them to fail.

I always put this one off until last. Check the injectors. Are they gummed up?

Let me know what you find out
Mike


Repair Help & Product Troubleshooting for 1996 GMC Sierra

Tips for a great answer:

- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.

Suggested Questions/Answers :

Loading ...

  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
  • Use proper spelling and grammar
all rights reserved to the respective owners || www.carrestorationshop.com || Terms of Use || Contact || Privacy Policy
Load time: 0.0053 seconds