Help rebuilding a Carter M7901G fuel pump
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Help rebuilding a Carter M7901G fuel pump

  1. #1
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    Default Help rebuilding a Carter M7901G fuel pump

    Looking for help rebuilding a Carter M7901G. (Bad diaphragm)
    This was their expensive Billet fuel pump which Carter no longer sells the replacement diaphragm or the pump.
    Edelbrock also sold a Billet fuel pump that looked the same and no longer sells diaphragms for theirs either.
    Holley still makes a Billet fuel pump that looks the same and I assume they have replacement diaphragms, but does anyone know if the pumps were made by the same company or if the diaphragms are interchangeable and the same?
    Will the diaphragm for the Holley work in the Carter pump?
    The pumps look exactly the same, other than Holly and Edelbrock etched their name on top.
    Name:  crt-m7900g_ml.jpg
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    Senior Member 787chuck's Avatar
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    I run the older cast model of the same pump and have nothing but good luck with it but I do run a little mystery oil at the end of summer but I think the sbc cast one has the same one you have
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  4. #3
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    Quote Originally Posted by jimsplace View Post
    Looking for help rebuilding a Carter M7901G. (Bad diaphragm)
    This was their expensive Billet fuel pump which Carter no longer sells the replacement diaphragm or the pump.
    Edelbrock also sold a Billet fuel pump that looked the same and no longer sells diaphragms for theirs either.
    Holley still makes a Billet fuel pump that looks the same and I assume they have replacement diaphragms, but does anyone know if the pumps were made by the same company or if the diaphragms are interchangeable and the same?
    Will the diaphragm for the Holley work in the Carter pump?
    The pumps look exactly the same, other than Holly and Edelbrock etched their name on top.
    Name:  crt-m7900g_ml.jpg
Views: 141
Size:  8.7 KB
    I would think that the differences in the pumps would be the valving and the spring calibration. A "match-up" of the diaphragms would (IMO) be worth a try.
    Dave
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    Thanks for the replies.
    I was hoping someone had experience in this area, so I didn't have to buy a diaphragm and then it not be the right one.
    The pumps look so much alike that I think they are the same, but with just different labels on them.
    They show to have the same flow rate and pressure along with looking exactly the same.
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    Did you try and get hold of and see if Clay Smith was any help. They rebuild there mechanical fuel pumps. I think that I have a cad drawing that I made when I was making my pump that would give you the dimensions of the bolt pattern of the diaphragm if you want it. Mine is for a Ford but I am guessing they probably use the same diaphragm on all there pumps.
    GD
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  8. #6
    Senior Member NiceGuyEddie's Avatar
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    I had to replace a Carter fuel pump last year. Carter no longer made that pump, but another company did. I can't recall the brand name, but Napa had it. Try giving Napa a call. They might be able to point you in the direction of the then MFG that took over some of Carter's line.
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