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GT4 Fuel Pressure

Discussion in 'Technical Q&A' started by maseratighibli, Mar 12, 2006.

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  1. maseratighibli

    maseratighibli Rookie

    Nov 29, 2003
    26
    Oxford
    Full Name:
    Gareth Kerry
    #1 maseratighibli, Mar 12, 2006
    Hi guys,still restoring the 308 GT4 but have just found that the original fuel pump looks a bit tired and the single 12v feed wire is about to break off at any second, I want to replace the pump with a facet red top which is capable of producing 7 or so psi,what is the correct pressure for the carb 308's and is the best way to regulate it with a filter king?
    I see the top of the range Malpassi filter king has a built in guage,is the filter in a facet a pre filter or do I still need to run a pre filter with one of these?

    Gareth
     
  2. Perfusion

    Perfusion F1 Rookie

    Oct 16, 2004
    4,151
    Marietta, GA
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    Aaron
    #2 Perfusion, Mar 12, 2006
    Good question... I'll be eager to see the responses. Although I've got an aftermarket Holley fuel pump in my GT4, it's always good to know what's "correct" (in terms of PSI, etc.) for the car to run, and also to know what other equipment will work in the case of a future failure of what I've got on there now.

    Aaron
     
  3. Steve King

    Steve King F1 Rookie

    Feb 15, 2001
    4,367
    NY
    #3 Steve King, Mar 12, 2006
    Based on some past posts here the best recommended replacement pump for the carb 308's is the Carter pump which can be purchased at Jegs or other on line auto parts store. It is the quitest and maintain 5psi and great volume. Try searching some of the past fuel pump posts.
     
  4. Peter

    Peter F1 Veteran
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    Dec 21, 2000
    6,440
    B.C., Canada
    #4 Peter, Mar 13, 2006
    I never got my car to run right with the Facet and I hated the loud noise it would constantly make (characteristic of those pumps).

    I reconditioned my original pump with a new electrical motor (which is what failed originally) and it's run perfectly since.

    Required pressure is 5 psi (manual calls for 3.5 m/H2O...) and it should deliver 100L/Hr (or 26.5 gal/Hr).
     
  5. Peter

    Peter F1 Veteran
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    Dec 21, 2000
    6,440
    B.C., Canada
    #5 Peter, Mar 13, 2006
    Last edited by a moderator: Sep 7, 2017
  6. maseratighibli

    maseratighibli Rookie

    Nov 29, 2003
    26
    Oxford
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    Gareth Kerry
    #6 maseratighibli, Mar 13, 2006
    Thanks for the info,I dont want the facet pump if it makes a loud noise,it would drive me crazy,Peter, it looks like you know your way around the original pump, is it easy to replace the length of wire for the feed?

    Gareth
     
  7. Sloan83qv

    Sloan83qv F1 Rookie
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    Mar 8, 2001
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    Little Dave M.
    #7 Sloan83qv, Mar 13, 2006
  8. Peter

    Peter F1 Veteran
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    Dec 21, 2000
    6,440
    B.C., Canada
    #8 Peter, Mar 14, 2006
    Last edited by a moderator: Sep 7, 2017
    Not really. You would have to pull the top housing off by prying the metal tabs which hold it on to the body to gain access to the wire on the inside/behind the grommet. In doing so, when putting the top back on, it'll never really line up properly, or stay on the body tightly... Been there, done that.

    You can try to repair the wire from the outside and then reinforce the wire by building it up with shrink-tubing. With my new pump motor, I did that to provide some strain-relief for the wire, to make it last longer (see photos in previous post).
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