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Thread: '92 vacuum pump

  1. #1
    Join Date
    Mar 2000
    Location
    Apex, NC
    Posts
    171

    Default '92 vacuum pump

    Not a trick question: Where is the vacuum pump on a '92 MFI? When I get a definitive answer, I'll explain why I asked the question.
    DP member #38 1992 Chev K2500 RPO C6P 6.5TD 150K miles
    2014 John Deere 1025R

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    It probably doesn't have one. Only a select few (such as Ca smog and some LD trucks) actually have/need it. If it does, it's belt driven, that's not the other usual belt driven accessories (PS pump, alternator, A/C, water pump).
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    I agree with Maverick.

    There would be no reason to have one on a 92

    The Turbo (if equipped) was manually controlled with a Spring loaded unit.
    The heater/HVAC system is all electronic (Except possibly some basic models that had cable controls)

    The tranny is electronically controlled

    No need for a vacuum pump.
    ***Exceptions****
    As mentioned
    Any smog items... EGR being the most common.

    Starting in 1994 with the change to the electronic injection the vacuum pump was added to provide a means to control the turbo waste gate in a manner that allowed the ECM to "micro manage" the turbo boost pressure in concert with the fuel delivery.


    We are curious to know the WHY ??????
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  4. #4
    Join Date
    Mar 2000
    Location
    Apex, NC
    Posts
    171

    Default

    Thanks to Robyn and Maverick. The reason I asked is because, like you two, I couldn't think of why there would be a need for one.

    But in searching for other parts online, just about every website shows a vacuum pump (belt driven) in the diagram for not only a '92 MFI but the '93 also. As far as I know, all '92 - '93 6.5s were turbo and HD F code, hence no smog stuff.

    The only thing I can think of why the vacuum pump is listed is because the 6.2 NA was available these same years and sometimes the parts manufacturers assumed most parts were shared between the two engines. And to add to the confusion, when ordering a drive belt, you must specify no a/c or a/c, and vacuum pump or no vacuum pump.

    I'm now waiting for someone with a '92 stating their engine has a vacuum pump
    DP member #38 1992 Chev K2500 RPO C6P 6.5TD 150K miles
    2014 John Deere 1025R

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