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1986 GMC Jimmy fuel system

Tiny
PONYUP
  • MEMBER
  • 1986 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 152,000 MILES
Hello, My friends and I Have rebuilt a 4.3 liter vortec motor for a Jimmy. The motor starts and runs great but when we shut the engine off the fuel pump continues to run. We timed it and it will run for about 55 to 60 seconds afted the engine is shut off. The vehicle never did this before the rebuild. We checked the relay in the glove box and all our connections. All seem to be well. Were wondering if there is another switch or if there is a bad ground or something. Hope you can help! Thanks
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Sunday, January 4th, 2009 AT 9:11 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
It is normal for it to run a few seconds after engine shutdown. The pump relay stays energized until the engine oil pressure bleeds off. Perhaps swapping out the relay with another will cut back on the long run time after shutdown.

Hope this helps.
Thanks for using 2carpros. Com!
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Sunday, January 4th, 2009 AT 9:30 PM

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