proper fuel pres. for a holly
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proper fuel pres. for a holly

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    Senior Member H20MOFO's Avatar
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    Default proper fuel pres. for a holly

    Sorry for the dumb Q? I've bought 2 new holly regulators to go with my holly blue pump, and I can't get either one under 9 psi. I pulled the float adj. plugs and at 9 psi nothing was coming out there??
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    gn7
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    you pulled the needle and seats out and nothing is coming out and yet your gauge shows 9 lbs? where is your gauge hooked up?



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    Senior Member PlacecraftTunnel's Avatar
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    Why two regulator?


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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Sorry for the dumb Q? I've bought 2 new holly regulators to go with my holly blue pump, and I can't get either one under 9 psi. I pulled the float adj. plugs and at 9 psi nothing was coming out there??
    Feed in the bottom, out the two side's ? Pull the line's off the carb's and loosen the set nut on top of the regulator to back it off half way and see what happen's.

    At the carb don't exceed 9 psi. Start with 7.5 lbs and work from there.

    I'm guessing you pull the float sight plug's ? Have you adjusted the needle and seat and are you sure your pump is moving the fuel ?

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    Senior Member H20MOFO's Avatar
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    I have only one regulator. The bowls are filled and adjusted to the bottom of the sight holes. I started,ran and timed it last night. Just cant figure out why I can't adjust it down. I thought I just had a bad regulator, but they both act the same. BTW is spinning the allen headed adj. on the regulator "in" supposed to make the pres go up or down? Oh I forgot to mention I have one of the outlet sides blocked off that wouldn't matter would it.

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    Adjusting the screw "in" should raise the outlet pressure.

    What port do you have blocked???

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    Quote Originally Posted by H20MOFO View Post
    I have only one regulator. The bowls are filled and adjusted to the bottom of the sight holes. I started,ran and timed it last night. Just cant figure out why I can't adjust it down. I thought I just had a bad regulator, but they both act the same. BTW is spinning the allen headed adj. on the regulator "in" supposed to make the pres go up or down? Oh I forgot to mention I have one of the outlet sides blocked off that wouldn't matter would it.
    One side wouldn't matter.

    Back the adjuster/ Jam nut out to lower the pressure. That is why I said" back it out half way and see what happen's"

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    Senior Member H20MOFO's Avatar
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    I'll try to put up a pic. Keep in mind I'm going to shorten the fuel line from the reg. to the carb . the fuel pres. gauge is up on the carb.
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    21 Daytona Outlaw's Avatar
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    here are the instructions here. you dont have a bypass reg do you?

    http://www.holley.com/data/Products/...199R7914-3.pdf

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    Distinguished Member David 519's Avatar
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    If you truly can't get the fuel pressure down below 9, it's likely the internal bypass in the pump is stuck. I'd take the bottom part of the pump apart and make sure everything is clean and working right. When we ran Holley blue's in our lake boat, we struggled with the vanes freezing up from rust and the bypass sticking. Frikken pump gas had a lot of water in it.

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    Senior Member H20MOFO's Avatar
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    No it's not a bypass, but I'm starting to wish I did. When I spun it all the way in it did go up to 12 lbs. So I assumed I needed to back it out, you can tell from the pic it's pretty well all the way backed off? I dunno maybe my gauge is junk. I guess as long as the needle and seat is holding back the pres. it's all good? The regulator is a holly 12-803, it's not supposed to go past 9 lbs.
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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by H20MOFO View Post
    ....I dunno maybe my gauge is junk. I guess as long as the needle and seat is holding back the pres. it's all good? The regulator is a holly 12-803, it's not supposed to go past 9 lbs.
    +1 on the gauge...should have mentioned that first.

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    I'm No Expert Shaun's Avatar
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    I just installed the same reg on my boat, not trying to question your intelligence or logic but one of my buddies who was watching me install mine though the regulator should be installed before the fuel pump... so my q to you is... You do have the reg installed between the fuel pump and carb right? Not before the pump? I see your reg is connected to your filter so thats why i'm asking, my large filter like that is before my pump.

    On that reg i was able to get my pressure down to 5lbs and i probably could have gone lower, my pump was pushing 8-9 lbs out of the box (my pumps a mallory)

  16. #14
    Senior Member H20MOFO's Avatar
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    Yeh the regulator and filter are after the pump. The pres gauge. is a cheap-o summitt liquid filled, I guess the only way I'll know is if I buy another? I could take the pump apart to see if that internal by pass is stuck but I don't know what I'm lookin for. The pump is brand new also. It doesn't go straight to 9 lbs it starts out at about six and then I can hear the pump changes sounds/tones then she goes up. This is with the key on and the motor off that shouldn't matter should it? My co-worker thought 9lbs was about right but he runs a deamon.??
    Another Hot Boat refugee

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