Holley Red pump. Any Ideas???
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Holley Red pump. Any Ideas???

  1. #1
    Cheers for beers! DELTA~HOLIC's Avatar
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    Default Holley Red pump. Any Ideas???

    My old Holley blue was mounted in the rear of my boat (not my doing) and my tank is in the bow. (it burnt out). I bought a new red pump and mounted it by the tank. I got rid of my pressure regulator because the red is internally regulated to 7psi. Basically after replacing the blue with the red I lost fuel pressure. At idle I was pushing 6 psi, when I got on it, it would slowly drop down to 2 psi at WOT. I have a 454 bbc, 850 demon carb. None of my fuel lines are kinked, and my filter is clean. Should I go back with a "blue" and a regulator? Or is there any specific reason why the red isn't working? Any Ideas?

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Yea, frictional pressure losses in the 20 feet of fuel line you are running. Normal physics.
    Pushing a fluid (or a gas) through a tube of any sort, results in friction drag where the fluid touches the tube. The larger the tube diameter, the less the center is affected by the drag at the edge.

    Same reason the water output from the end of a 100 foot garden hose isn't nearly as much as it is at the faucet.


    Either go to bigger fuel line (to increase the volume pumped), or push it at higher pressure. The bigger line is the better way.
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    Resident Ford Nut Sleeper CP's Avatar
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    All of the above and check your tank vent.

    Sleeper CP

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    Cheers for beers! DELTA~HOLIC's Avatar
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    Im curently running 3/8 fuel line. What size should I go with?

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    Senior Member Brendellajet's Avatar
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    Not sure if those pumps are better at pushing or pulling, but why not try relocating where the other one was?

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    Quote Originally Posted by Brendellajet View Post
    Not sure if those pumps are better at pushing or pulling, but why not try relocating where the other one was?
    I believe all electric fuel pumps are better at pushing than pulling. The closer to the tank the better.

    Since 1/2" is bigger than 3/8" you could start there. That would put you at a 33% increase if dia for the fuel line.

    Use it on both sides of the pump or just go back to a Holley Blue with a reg.

    Sleeper CP
    Last edited by Sleeper CP; 08-24-2008 at 09:40 PM.

  9. #7
    Cheers for beers! DELTA~HOLIC's Avatar
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    right now the pump is about a foot away from the tank and mounted at the lowest possible point. I will try 1/2'' and see what happens. Thanks for the help guys.

  10. #8
    ptz
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    are you running a return line ?
    i'de run 1/2 to the carb... and 5/16 as a return and full flow it.
    hard aluminum..
    if you'r on a budget and don't have stock in russell.
    remember the fuel cools the pump.

    also... the volume of the fuel line (size) can act as a main jet

    on the holley type pump..( because there are also clones)
    you can remove the cover plate and clean the brushes and armature with brake cleaner.
    some times they get gummy and full of carbon and arc out..
    buddy used one on his dyno and it lasted almost a year.
    his dyno ran every day some times hours at a time.

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    Good advise on return system, great article at Century Performance. Also you can buy a kit to change pump pressure.

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    Cheers for beers! DELTA~HOLIC's Avatar
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    Default 1 more question!

    I have my water seperator/fuel filter mounted afer the pump towards the rear of the boat. I was told by someone that I should have that before the pump, and that there might be a restriction at that jucnture. Any ideas?

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    Sit N' Spin Jetaholic's Avatar
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    Danny, something else I thought of. The blue pump requires the external regulator. I'm thinking this is so the fuel can be pumped from the tank at high pressure over a longer distance, then regulated down right at the carb so as not to overpressure the carb.

    The red pump is internally regulated. Something I didn't think of when you decided to go with the red pump. Now your pressure is down before it even gets to the carb. At lower pressure with the longer distance from your tank to the carb, the pump may not be able to keep up with the fuel demands of the engine.
    Last edited by Jetaholic; 08-26-2008 at 11:04 AM.



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    Quote Originally Posted by DELTA~HOLIC View Post
    Or is there any specific reason why the red isn't working? Any Ideas?
    Yes, it's the wrong pump for your application

    I forgot to add that to my first post and I should have added that the 1/2" fuel lines are a band aide that may not work, make sure all your fittings are 1/2" also.

    If you put a Holley Blue back on put the reg at the carb.

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    Quote Originally Posted by DELTA~HOLIC View Post
    I have my water seperator/fuel filter mounted afer the pump towards the rear of the boat. I was told by someone that I should have that before the pump, and that there might be a restriction at that jucnture. Any ideas?
    Mine is set up with the water seperator/fuel filter set just before the pump.

  16. #14
    Senior Member djmadmatt's Avatar
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    That or Mount the Holley Red back on the Transom and put a Primer Bulb withing hands reach under the dash to prime it ... Should work great that way ... Mine does.

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