Question about 1993 GMC Sierra K1500

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

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.

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  • Anonymous Oct 27, 2008

    same

  • gmpartsguy May 10, 2009

    i have a 1993 chevy k1500 thats getting 9 miles to the gallon, and getting raw gas fumes from tailpipe

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3 Answers

Just confirmed what the GmC k2500 diesel said, about the ignition switch.

Fault tracing had discovered no power to the three fuses that are ENG-1 (to most sensors), ECM-1 (to VCM AND injectors)and IGN-E (to ignition coil).

I did have ignition on added fuel, last attempt at troubleshooting no start condition.

Posted on Oct 05, 2008

Did you check the fuel filter?
or possably the catalitic converter is cloged, check the exhaust pressure.

Posted on May 27, 2008

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  • 375 Answers

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.

Posted on May 18, 2008

2 Suggested Answers

Mike258
  • 1498 Answers

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

Hey there boatright33,

A few things things immediately come to mind.

There may be a problem with the engine controller. You could check the ODBII onboard diagnostics. Auto part stores will usually do this for you 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


Posted on Aug 12, 2008

6ya6ya
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Posted on Jan 02, 2017

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