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Fuel pump check valve

Discussion in '365 GT4 2+2/400/412' started by jacques, Jun 18, 2011.

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  1. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #1 jacques, Jun 18, 2011
    I am in search of the proper part # for the fuel pump check valve on my 1980 400i...I don't have the car up in the air,so I cannot tell you the fuel pump model #..are the check valves model specific, or are they a universal # throughout the pump model/type range? Looks can be decieving... I have posted in " technical " also..Any and all responses will be greatly welcommed..Thank you all in advance so very much...Jacques
     
  2. new ulm 400i

    new ulm 400i Karting

    Sep 1, 2007
    117
    Taipei, Taiwan
    Full Name:
    Lee Atkinson
    #2 new ulm 400i, Jun 19, 2011
    Last edited by a moderator: Sep 7, 2017
    The check valve is built into the pump, it cannot be serviced, replaced, or lost :) . Bosch refers to these as "female fitting with internal check valve", and as I can see the '975 pump is unique in that it has the 15mm intake and the long nose that holds the check valve. These are just about impossible to find, so the typical replacement is to use a standard pump with external check valve and then use a 12x1.5mm acorn nut to replace the banjo bolt that goes with the '975 pump. See the short list of relevant pumps attached--Lee
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  3. new ulm 400i

    new ulm 400i Karting

    Sep 1, 2007
    117
    Taipei, Taiwan
    Full Name:
    Lee Atkinson
    #3 new ulm 400i, Jun 19, 2011
    Oh, one more thing; the 12x1.5mm acorns are hard to find, until you look near motorcyle shops (search for "cap nuts" for Honda or Harley, often big steel chrome things....These will do the trick if you swap gas pumps)--Lee
     
  4. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #4 jacques, Jun 19, 2011
    Thank you so very much for your pump data...I just happen to have a brand new in-the-box "975" pump that I bought a year or so back..Well, when I had the car up in the air to replace the pump, of course the plumbing was different, so I did not change it out,,between your post and Steve's, I can accumulate the proper fittings..thank you very much again..Jacques.
     
  5. Geert Jan Schreurs

    Geert Jan Schreurs Karting

    Jul 14, 2010
    54
    netherlands
    Full Name:
    Geert Jan Schreurs
    #5 Geert Jan Schreurs, Jun 20, 2011
    I have made a couple of m12 * 1,5 dome nuts and put the on my site. With these nuts you can fit the (cheap remake) fuel pump with an outside check valve.
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,870
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #6 Steve Magnusson, Jun 20, 2011
  7. It's Ross

    It's Ross Formula 3

    Jul 30, 2007
    2,028
    Barrington, Ill. USA
    Full Name:
    Ross
    #7 It's Ross, Jun 20, 2011
    M12 x 1.5 is a common size for lug nuts.. ???
     
  8. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #8 jacques, Jun 21, 2011
    Thank you all so very much for the prompt responses..I also just dicovered an additional electrcal nuance..On the relay board is a white plastic 4-way electrical connector with for over-size spade recepticals..the come totegether in the form of an "H"..one of the junctions is burnt and very loose..when I wiggle it, and tighten it, the car starts right up..I went to West Marine store and got 60 amp circuit breaker that I am going to install early some morning as the temperature here on the Florida Sun Coast is 90 deg. by noon..I (we) can only hope that this simple fix cures the problem.. it just seems inane as to Ferrari's electrical logic...(oxy-moron) approach..gimme my old Jag / Lucas anytime..thanks again..Jacques.
     

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