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cat fuel pump upgrade

Discussion in 'Trucks [ Eighteen Wheelers ]' started by upallnite, Dec 6, 2012.

  1. Dec 6, 2012 #1
    upallnite

    upallnite Light Load Member

    165
    115
    May 15, 2010
    Hempstead,TX
    0
    Just purchased a new transfer pump 316-6863, was wondering if the new updated spring would be installed or would I need to purchase this also.
     
    upallnite, Dec 6, 2012
    upallnite, Dec 6, 2012
    #1
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  3. Dec 6, 2012 #2
    Superhauler

    Superhauler TEACHER OF MEN

    12,209
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    Jan 30, 2010
    keep stroking.
    0
    more than likely you will have to get the spring. the one i bought about 2 months ago had the weak one in it!
     
    Superhauler, Dec 6, 2012
    Superhauler, Dec 6, 2012
    #2
    kat man and upallnite Thank this.
  4. Dec 8, 2012 #3
    belltransit

    belltransit Light Load Member

    271
    27
    Jun 28, 2010
    oak grove, mo
    0
    whats the numbers on the stronger spring?
     
    belltransit, Dec 8, 2012
    belltransit, Dec 8, 2012
    #3
  5. Dec 8, 2012 #4
    Superhauler

    Superhauler TEACHER OF MEN

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    keep stroking.
    0
    # 339-4983
     
    Superhauler, Dec 8, 2012
    Superhauler, Dec 8, 2012
    #4
  7. Dec 9, 2012 #5
    belltransit

    belltransit Light Load Member

    271
    27
    Jun 28, 2010
    oak grove, mo
    0
    is this something a guy with some mechanical knowledge can do in their driveway? do u get the spring from the dealer or can it be gotten aftermarket?
     
    belltransit, Dec 9, 2012
    belltransit, Dec 9, 2012
    #5
  8. Dec 9, 2012 #6
    Superhauler

    Superhauler TEACHER OF MEN

    12,209
    100,727
    Jan 30, 2010
    keep stroking.
    0
    get from the cat store, and yes you can do it in the driveway. just dont loose the valve at the other end of spring when you take the spring out.
     
    Superhauler, Dec 9, 2012
    Superhauler, Dec 9, 2012
    #6
  9. Dec 9, 2012 #7
    Gear head

    Gear head Medium Load Member

    532
    91
    Apr 1, 2012
    Belair,md
    0
    The new spring can be a pain to get the threaded nut back on.
     
    Gear head, Dec 9, 2012
    Gear head, Dec 9, 2012
    #7
  10. Dec 9, 2012 #8
    belltransit

    belltransit Light Load Member

    271
    27
    Jun 28, 2010
    oak grove, mo
    0
    this new spring will boost the fuel pressure to where it should be for a factory 550? im always looking to see if i can get better fuel mileage. i have the fuel and boost wires on and they seemed to have helped some. at least till the winter fuel started.
     
    belltransit, Dec 9, 2012
    belltransit, Dec 9, 2012
    #8
  11. Jan 1, 2013 #9
    mtoo

    mtoo Road Train Member

    1,928
    4,427
    Jan 15, 2011
    Retired on bended knee
    0
    went to get the 316-6863 pump and 339-4983 spring kit yesterday. The pump has been updated to 384-8611, this pump comes with the 339-4983 spring installed. before install pressure at idle 75-76 @ 1900 89-90. after install idle 81-82 @ 1900 99-101. It was an easy driveway install. This was on a 6NZ
     
    Last edited: Jan 1, 2013
    mtoo, Jan 1, 2013
    mtoo, Jan 1, 2013
    #9
    black_dog106 Thanks this.
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