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Thread: I have a aftermarket fuel pump. Do I need the stock electric pump?

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    Bobby Lee Bobby_Lee's Avatar
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    Question I have a aftermarket fuel pump. Do I need the stock electric pump?

    Alright I have triple webers with no mechanical and an aftermarket electric fuel pump. This is in a 260Z. Do I, in fact, need the stock electric pump? I seem to be getting enough fuel pressure. I do have a fuel pressure regulator.
    Thanks to all who answer..........
    Bobby_Lee

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    Former frequent poster sblake01's Avatar
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    I would say that you don't need the factoy pump and it was just used to suppliment the mechanical pump. An aftermarket pump will replace both as it is designed to be the solitary pump. But I'm an EFI guy, maybe the carb guys will step in and correct me if I'm wrong.
    Last edited by sblake01; 03-20-2006 at 11:24 AM.
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    Bobby Lee Bobby_Lee's Avatar
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    Thanks Stephen,
    That was the conclusion I came to on my own. Common sense would dictate that to be the case. But, there are far brighter Z owners than myself

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    Former frequent poster sblake01's Avatar
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    Or, myself!!
    2004 Ford Ranger EDGE Supercab
    (@Moonpup: This one really is an EDGE!)
    2005 Pontaic GTO
    2010 Mercedes Benz C300 AMG Sportline (Wife's car)
    2014 Kia Rio LX (Wife's daily driver)
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    240Z Original Owner ZIII's Avatar
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    Bobby Lee,

    I would recommend that you pull the mechanical fuel pump.

    However, with trip-carbs, "flow rate" is just as important as "pressure rate." You should ensure that your fuel pump has the capacity to push out at least 60 GPH at a minimum of 3 PSI.

    I use a Holley red top, that puts out 71 GPH at 4 PSI and I try to keep my pressure just below 4 PSI.

    Hope this helps.....

    George
    George

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    beandip beandip's Avatar
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    I have said it a dozen times that the RX-7 pump will supply the SUs and or Tripples . I have tried it and it will . I used a pump froma '80 RX-7 . No pressure regulator is needed. Plus it is quiet. $15.00 at a u pull it.
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    Registered User Curtis240Z's Avatar
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    You are fine.

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    Bobby Lee Bobby_Lee's Avatar
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    Hello all,
    I do have the mechanical pump off the car. I have a Purolator pump. It is noisy! I may have to look into that Mazda pump. I'm running aubout 3.5 lbs at the carbs. I also didn't mention it, but I didn't dead head it at the rear carb. I've continued it on to the return line. It seems there is some controversey over ending it or having it go to the return line. In the pic you can see the pressure regulator on the far left. The gauge is just before front Weber. And thanks to all of you who took the time out to answer this post!


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    Lord of the Fries rztmartini's Avatar
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    is there a way to run a new fuel pump to the stock SU's (with a regulator)? thinking about putting in a fuel cell...thanks!

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    I run the RX-7 pump too on both my triple Dellorto l24 and 6500w Onan generator. Dead quiet and very capable of supplying the fuel you'll need. As for the SU's, I used a stock (noisy) pump until converting to the RX-7 pump. I used three (overkill) dial-type regulators. One in the main line and one for each carb. They were set to 2.5 psi and the SU's ran fine.

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    Lord of the Fries rztmartini's Avatar
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    for the rx7 pump, does it have to be the 3rd gen or the 2nd gen "turbo II"? will an aftermarket pump work as well?
    First Z, First True Love...

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    It has to be from a CARBURATED RX7.

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    Lord of the Fries rztmartini's Avatar
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    so with the RX7 pump and regulator, that will eliminate the mechanical fuel pump alltogether?
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    Bobby Lee Bobby_Lee's Avatar
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    I only have my Carter (Not a Purolater as in my prior post ) electric fuel pump and regulator at this point. No stock electric in the back and no mechanical, with Triple Webers and everything is running fine.

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    Lord of the Fries rztmartini's Avatar
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    what psi do you have the regulator set for? would that differ if it were dual SU/single holley...etc or would that depend on the carb?
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