electric fuel pump help
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electric fuel pump help

  1. #1
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    Default electric fuel pump help

    i want to go from an mechanical fuel pump to a electric fuel pump, i got two tanks, each line goes to a fuel filter then one line out to the mechanical pump then to the carb.should i bypass the mechanical with the electric or put it befor the fuel filter???
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    Senior Member UNASHAMED's Avatar
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    basically bypass it, run it after the filters
    "Don't make me get my penguin"
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    IMHO...you would be better off sticking to the mech fuel pump...elect pumps are pushers & unless its mounted back by the tanks, a mech is a much better choice...you can get them in alot of different gph's & they work just fine! ...even with T/R's

    FastRat
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    Senior Member Boat 405's Avatar
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    mount it after the fuel filter, it will work great. I have -08 lines from my tanks to the fuel valve, then -08 from the valve to the filter and then -08 to the pump and then -08 to the 4 port regulator and then 4 -06's to the carbs. Works great never had a problem.

    Get a good electric fuel pump and don't worry about it. I use the street strip aeromotive pump in my cruiser with 700hp without problems.

    Boat 405.
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    cool thanks guys.....i think i have a fuel starvation problem,when i run full throttle for about 30 seconds i drop rpm's like its not getting enough fuel...when i back off for a little bit then hit it, the r's jump back up
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    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by ridinfool View Post
    cool thanks guys.....i think i have a fuel starvation problem,when i run full throttle for about 30 seconds i drop rpm's like its not getting enough fuel...when i back off for a little bit then hit it, the r's jump back up
    I chased my tail on a problem with identical symptoms. It wasn't the fuel pump.

    Do you have a fuel pressure gauge on it? If so have someone watch it when you're having the problem. If the pressure doesn't drop see below info.

    My problem was a $8.00 repair. Jet extensions on the secondary metering block fixed it. It wasn't until I changed just about everything else that I found the real problem. What happens is the fuel will wash to the back of the bowl (the jets are in the front) and it will effectively run out of gas. When you get back off the throttle, the fuel bowl will refill and stabilize level and run o.k. until you stab the throttle and hold it again.

    The extensions move the jets towards the back of the bowl by about 1" or so and it's enough to make the difference.

    It's possible that this isn't your problem, however before buying a $200 fuel pump and everything it takes to swap it over, I'd try the cheap fix first.

    http://www.summitracing.com/parts/HLY-122-5000/

    Last edited by Squirtcha?; 06-05-2010 at 09:11 PM.
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  9. #7
    Cas
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    Quote Originally Posted by Squirtcha? View Post
    however before buying a $200 fuel pump and everything it takes to swap it over, I'd try the cheap fix first.
    ditto that! there are many causes of the symptoms you're describing. I had the same thing happening on a boat a few years ago and it turned out to be plugged screens in the tank on the bottom of the pick-ups.
    Here are a few other reasons I've read about or seen over the years
    bad check valve on the tank
    plugged vents
    crimped fuel line
    collapsed fuel line
    plugged filter
    plugged filter in the carb at the inlet
    the issue Squirtcha mentioned

    lots of little and inexpensive things to check first. If you're going with a Holley electric, buy 2 so you have a spare to carry with you
    .
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  10. #8
    B1 Racing cs19's Avatar
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    Ive switched all my stuff so it pumps the fuel through the filters, will never go back.

    On electric fuel pumps you must run a relay, when a pump loses only a little voltage the efficency of the pump goes way way down. They are designed to work with full voltage only. Ive had fuel delivery issues from no relays. If your making any kind of HP and there is a demand for fuel that is something to look at.
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    Quote Originally Posted by cs19 View Post
    Ive switched all my stuff so it pumps the fuel through the filters, will never go back.

    On electric fuel pumps you must run a relay, when a pump loses only a little voltage the efficency of the pump goes way way down. They are designed to work with full voltage only. Ive had fuel delivery issues from no relays. If your making any kind of HP and there is a demand for fuel that is something to look at.
    What's the best type of relay? when I installed my blue holley electric pump (gen-5 ,no mech pad) I temporaraly used a 30 amp KC headlamp relay and used both outputs. One 10G in then two 12g double wired to a single connector at the pump. It has worked well for years but It is one of those little "I want to get it right items".

    I'm also pulling through the filter and bypass back into it to help cool the pump a tad. Some day I'll run a return line.... maybe.
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    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by ridinfool View Post
    cool thanks guys.....i think i have a fuel starvation problem,when i run full throttle for about 30 seconds i drop rpm's like its not getting enough fuel...when i back off for a little bit then hit it, the r's jump back up
    Your floats also may not be properly adjusted. I had this problem back with my 660's when they where inline. Properly adjusted the float level and probelm solved!
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  13. #11
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by Carlson-jet View Post
    What's the best type of relay? when I installed my blue holley electric pump (gen-5 ,no mech pad) I temporaraly used a 30 amp KC headlamp relay and used both outputs. One 10G in then two 12g double wired to a single connector at the pump. It has worked well for years but It is one of those little "I want to get it right items".

    I'm also pulling through the filter and bypass back into it to help cool the pump a tad. Some day I'll run a return line.... maybe.

    I used a standard automotive relay from radio shack, 12V30amp. Have 4 of them in the boat. No problems at all.

    http://www.radioshack.com/product/in...ductId=2062477#
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  14. #12
    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by Shaun View Post
    Your floats also may not be properly adjusted. I had this problem back with my 660's when they where inline. Properly adjusted the float level and probelm solved!
    Also an excellent suggestion. And that one's free!
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  15. #13
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    If you go to a fuel return system that problem would be solved. Same principal as fuel injection system. Best explained in Century performance web site.
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