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Fuel Pump Question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by GrandNat86, Apr 6, 2001.

  1. GrandNat86

    GrandNat86 Registered Member

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    Sayville, Long Island, NY
    I was wondering how long the fuel pump should run on my '87 K5 with a 350 TBI. After I shut of the motor, the pump continues to run for up to 10 seconds. I thought thisa seemed unusually long. Thanks for any info.

    --------
    Rob Andersen
    '87 K5 Silverado
    '86 Buick Grand National
     
  2. 87JIMMY

    87JIMMY Registered Member

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    I don't remember mine running after I shut down at all. If nobody else on the board knows, I can check tonight after work and repost.

    Scott 87JIMMY
     
  3. BurbinOR

    BurbinOR 3/4 ton status

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    Totally normal..............my converted TPI 406 does it for a few seconds, and my engine builder/TPI conversion guru mentioned that is totally normal.

    <font color=orange>'79 - 406 TPI -<font color=orange> K5#5 - <font color=blue>See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.coloradok5.com>http://www.blazzinor.coloradok5.com</A>
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Not really a problem, but I have seen them just keep running... this can fry the pump pretty quick. Usually it is fixed by throwing in a cheap fuel pump relay. Has worked twice for me now and the other was shorting in the wires.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  5. HispanicPanic

    HispanicPanic 1/2 ton status

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    you should wire the pump to your acc. so when you turn the key on or off the pump turns on or off immediatly cuz like CaptCrunch said if it runs to long it'll fry so if you think about it 10 sec after a while start to add up. thats just my opinion

    <A target="_blank" HREF=http://jimjim.coloradok5.com>http://jimjim.coloradok5.com</A> [​IMG]
     
  6. Triaged

    Triaged 1/2 ton status

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    The fuel pump runs all the time that the engine is on. With how many hours it is run I don't think 10sec. would make any difference. What kills fuel pumps is runing them dry (i.e. Run out of gas). They are cooled by the fuel and overheat when you run out of gas. I have multiple friends that have destroyed them this way (Some more than once. You think they would learn after the 1st).

    '71 Blazer CST with alot of rust
     

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