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Thread: Changing from mechanical fuel pump to electric
          
   
   

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  1. #1
    Jim Standley's Avatar
    Jim Standley is offline CHR Member Visit my Photo Gallery
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    Changing from mechanical fuel pump to electric

     



    I'm getting ready to change from a mechanical fuel pump to an electric pump. It' s a 55 Chevy 210 with a 350 and has no return line to the tank. Do I need one with the electric pump. I have a regulator in line to a Edelbrock 650 ?

  2. #2
    HOSS429's Avatar
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    Car Year, Make, Model: 73 pinto -80 pinto- 69 mustang 429
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    i`ve been running a tiny electric pump on my 4.3 V6 pinto for 4 years .. never a moments trouble .. no return line ..`im not even sure if i used a regulator .. ` i got it at oriely`s .. i`ll check and see what it`s brand name is and if it has the reg ..
    iv`e used up all my sick days at work .. can i call in dead ?

  3. #3
    bada's Avatar
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    Depends on the pump, that you are going to use. And what you are using it for.But you should be able to buy a pump for that engine, that will work fine on the street. Plus be good for the track if you want to make a few passes. That will work fine with no return. Like a holley black, or mallory comp 140. They are good for continuous duty use, and work just fine on the street. If you want to step up in size a little. a BG hot rod 280 will work. Hope this helps.

  4. #4
    rumrumm's Avatar
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    Stay away from a Holley pumps--without a return line they get hot and puke out. Mine lasted a year and a half. Go with a Mallory pump at the url below. It uses a different design than Holley and it does not have provisions for a return line. Mallory pumps come highly recommended on a lot of performance forums, and it is the one that is presently on my car.

    http://store.summitracing.com/partde...5&autoview=sku


    Lynn
    '32 3W

    There's no such thing as a girl too pretty or a car too fast!

    http://photo.net/photos/Lynn%20Johanson

  5. #5
    Yellow72's Avatar
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    Just curious why you want to change to an electric pump?
    Mechanical pumps will easily support 600-700 carbureted horse power.

  6. #6
    bada's Avatar
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    I ran holley on my street rides for over 10 years without a problem.

  7. #7
    Mr Blue's Avatar
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    I have been running a "Summit Racing" electric pump on my T with two 500 cfm Edelbrocks for well over a year now. It came as a kit from Summit Racing. Oviously the pump is made for them by someone else (probably Holley) and have had no issue and was very reasonable (Included Pump, Chrome regulator and all brackets. good deal to be sure. Don Jr.
    Don Jr.
    "Once again I have thoroughly disgusted myself"

  8. #8
    Jim Standley's Avatar
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    Quote Originally Posted by Yellow72 View Post
    Just curious why you want to change to an electric pump?
    Mechanical pumps will easily support 600-700 carbureted horse power.
    Yellow 77. Good question. I was given one as a gift and want to do some changes to the car. Buy the way it's a Holly Red Elec fuel pump.
    Last edited by Jim Standley; 01-23-2009 at 01:27 PM.

  9. #9
    mopar34's Avatar
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    I have had Stewart Warner electric fuel pumps on my cars for over 12 years and never any problems. They make a 6 volt and a 12 volt pump, no return lines. I have a pressure regulator on the 57 but it probably doesn't need one. No pressure regulator on the 34 Plymouth. Pressure max is about 7 psi, and the regulator on the 57 is set for about 5 psi.

    Just to be safe I do carry a spare pump in case one would fail but only because of the age of the pumps, not the quality of the units.
    Bob

    A good friend will come and bail you out of jail....but a true friend will be sitting next to you saying..."Damn....that was fun!

  10. #10
    bada's Avatar
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    Quote Originally Posted by Jim Standley View Post
    Yellow 77. Good question. I was given one as a gift and want to do some changes to the car. Buy the way it's a Holly Red Elec fuel pump.
    The red is to small.

  11. #11
    Jim Standley's Avatar
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    To small for street use only ?

  12. #12
    kitz's Avatar
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    From a previous post of mine ............

    The Mallory pumps are Gerotor type. The Holley blue, red, and blacks series are rotary vane type pumps. Gerotor pumps are much more rugged than RV pumps and also have superior suction qualities over RV pumps in general. And, surprise surprise, the Gerotor pumps are more expensive. Holley also makes Gerotor pumps and they are slightly less expensive than Mallory pumps according to what I've seen on Summit.

    My suggestion for purchasing electric pumps;

    1) Buy a Gerotor style pump
    2) Use an oil pressure cut off switch with it if possible
    3) Don't use too much pump. For gasoline, natural aspiration you need 8-9 GPH (at 4-7 psi) per 100 hp.
    4) For max perfromance and cool factor buy a pump with 12-14 psi and use a bypass style regulator with return line. This will make it very hard for you to overheat the pump or experience vapor lock.
    5) Use 15-30 mic screen before pump and 10 mic filter after pump.
    6) Use minimum 3/8 line suction and supply/return. Avoid 90 degree elbows close to carb, curved tubing or hose better
    7) Mount pump using 3/16 rubber pad to frame
    8) Use a relay switch with the pump. You may also want to use a hidden toggle for added theft prevention

    I think that gets most of it. If you already have a rotary vane pump go ahead and use it.

    The Holley red pump supports 425 HP ............

    Kitz
    Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400

  13. #13
    JeffB2's Avatar
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    electric fuel pump

     



    I would recommend the Carter P4070,they are not noisy like the Holley & Pro-Comps'.No matter which one you get buy a wiring kit with relay and a good filter to go between the tank and pump.Speedway tells you not to use a paper element filter,Good Advise! I found out the hard way,junk Fram's paper element sucked into inlet and burned up a new Holley pump in less than 2 hours

  14. #14
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    Holley red is not too small for a 350 street motor... I was running red pump on my 427 drag motor for two years but that was borderline for racing but was fine on the street. Things to look out for are under hood temps... I'm running a Holley blue with dead head regulator and have had problems boiling gas around town driving that I've been trying to mitigate with heat shield/insulating the fuel line. I'm switching to bypass regulator with return line this offseason.... I'm looking at the BG 280 for my new system. If this is mainly a street car, why change from the mechanical pump? I know racers that are still running a mech pump for their "low end" (~12s) drag cars.

    -Chris
    Paint don't make it no faster

  15. #15
    glennsexton's Avatar
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    The Holley Red should be more than enough for up to 650+/- horsepower. The formula for determining flow (in gallons per hour) is as follows:
    HP/2 = lb/hr
    lb/hr / 6 = GPH
    multiply GPH x 1.15 to provide a margin of safety

    So 650/2 = 325
    325/6 = 54.166
    54.166*1.15 = 62.3 GPH
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