Fuel system tech:
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Fuel system tech:

  1. #1
    Resident Ford Nut Sleeper CP's Avatar
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    Default Fuel system tech:

    Yesterday while draining my fuel tanks after the Tom Papp run I decided to re-check the flow of the fuel pumps.

    The fuel system on the CP looks like this:



    It runs two of these 150 GPH Holley pumps # 510-12-150 (jegs part#) $210.00:



    The system has a three-way switch that can run left,right or both pumps. Some years back I modified the fuel tanks with 1/2" pick-up tubes. I had these J- tubes built and I drilled the fuel tanks and installed them:



    The system pulls out of the stock pick-up and the new J tube.

    The pumps are rated at 150 GPH so yesterday I re-checked the flow. Both pumps , one at a time, moved 2 gallons of fuel in 50 seconds and when both pumps were working together they pumped 2 gallons in 31 seconds.

    Our system has a high flow regulator that has zero ( 0 ) flow restriction:


    So with the measured fuel flow the Holley 150 pump moved 144 gallons per hour individually and 232 gallons working together. The 144 gallons per hour is enough fuel to feed 1,728 hp (144 gallons x 6lbs per gallon = 864 lbs / .5 (BSFC of 1/2 lbs fuel per hour per hp) and the two pumps working together move enough fuel (at 1,393 lbs per hr) to produce 2,787 hp at a BSFC of .5.

    The 565 has a BSFC of less than .40 so on one pump at 864 lbs per hr an engine with a BSFC of .375 could make 2,304 hp.

    The Holley 150 pumps cost about $ 220.00 from Summit and Jegs and ours run for hrs and hrs. So if someone is considering a fuel system up-grade this Winter they are very good pumps ( bang of the buck wise). But if you have stock pick-ups in your tanks you should replace them with larger pick-ups.

    In any case you can up-grade your fuel system without spending a small fortune and use the money saved for something else on your boat. We never had the money to over spend on things so we found alternative ways to do somethings.

    Hope this helps a few people.

    Edit: I guess I should add that if someone has an old Holley Blue that is rated at 110 gph and you re-place the small pick-up tubes and run 1/2" or -8 fuel lines with a high flow regulator you can feed over 750 hp with that small pump.

    One thing about a boats fuel system is that you don't have to push the fuel 12-16' like you do in a car. The lack of friction loss in the shorter fuel lines really helps a boat get away with a smaller pump.



    Sleeper CP
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    Last edited by Sleeper CP; 01-17-2009 at 12:03 PM.

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  3. #2
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    Sleeper-- You are way too smart for me.

    Thanks for trying to educate me. I'm gonna read it another few times, I'm sure. But nothing's sunk in so far..

    I just have a gage. If the pressure drops, I buy a bigger pump.

    RT
    Is it just me or are toilet seats getting smaller?

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    Quote Originally Posted by rightytighty View Post
    Sleeper-- You are way too smart for me.

    Thanks for trying to educate me. I'm gonna read it another few times, I'm sure. But nothing's sunk in so far..

    I just have a gage. If the pressure drops, I buy a bigger pump.
    RT
    Maybe the pumps not the problem, maybe it's the fuel lines/pickup or a restrictive regulator ? You should always flow the system to the carb to isolate the problem ( if you have an electric pump).

    Bigger fuel lines and regulators are cheaper than bigger pumps.

    I used to know alot of guys with 250 or 400 GPH pumps ( $$$$$) with 750-800 hp engines. We ran our 855 hp engine off of Mallory 140's. And it ran just fine using one of them or both at the same time.


    Sleeper CP

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    Senior Member cave's Avatar
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    Now you post this



    I'm increasing my pick up tubes to 1/2" pick ups in the tanks. Thanks for help Sleeper CP

    Just to make sure you don't have any fuel delivery problems, make sure your carbs have high flow needle and seats; either .110 or .130 windows for boost on any long run the standard .085 windows won't due.
    I'm tad ill today so Wednesday I'll pick up the new hi Flow Seats & Needles.
    Takin it home

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    Ive got a guestamated 700+hp single dom. NA BBC in my hydro. The tank is in front of the engine and the Holley black pump is at the rear. It runs through the standard Holley reg with 90* bends and all -8 lines. Never had a fuel delivery problem yet. I figure the g forces are helping out. I ran the same set up on a 650hp or so with a blue pump. I went with the black with this motor because the blue was getting old and figured a few more gph couldn't hurt.

    Tim

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    CANT RE MEMBER FARMER JOHN's Avatar
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    [quote=cave;501326]Now you post this



    I'm increasing my pick up tubes to 1/2" pick ups in the tanks. Thanks for help Sleeper CP



    LIKE JON POINTED OUT, THE TRICK HERE WHEN RUNNING TWO PUMPS FROM SEPERATE TANKS, IS THE CHECK VALVES, TO STOP RETURN FLOW! THEN YOU CAN RUN ONE OR THE OTHER OR BOTH

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    Senior Member cave's Avatar
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    THE TRICK HERE WHEN RUNNING TWO PUMPS FROM SEPERATE TANKS, IS THE CHECK VALVES
    Would that be a 1 way check valve?
    Takin it home

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    Quote Originally Posted by FARMER JOHN View Post


    LIKE JON POINTED OUT, THE TRICK HERE WHEN RUNNING TWO PUMPS FROM SEPERATE TANKS, IS THE CHECK VALVES, TO STOP RETURN FLOW! THEN YOU CAN RUN ONE OR THE OTHER OR BOTH
    When I was young and not so smart you wouldn't believe how I found out how important back-flow valves are ... ooooppppps.

    Sleeper CP

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    CANT RE MEMBER FARMER JOHN's Avatar
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    Cool keep it in check

    Quote Originally Posted by cave View Post
    Would that be a 1 way check valve?
    HAY JON, HAY CAVE, yea that looks like a #8, i was going to edit my last post to say, make sure you get a big enough one so as to not restrict flow
    yea jon i made the same mistake before, my problem is i was never as young as youo yea i forgot not as smart either
    Last edited by FARMER JOHN; 01-12-2009 at 05:13 PM.

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    Senior Member VDRIVERACING's Avatar
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    CP - My tanks just have fittings at the bottom/rear of the tanks. I'm curious to know the purpose of the J tubes.

  13. #11
    steelcomp was here
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    I'm not clear on why you're using both pickups in the tanks, with the -6, and the -8.
    Last edited by scott foxwell; 01-12-2009 at 05:46 PM.
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  14. #12
    CANT RE MEMBER FARMER JOHN's Avatar
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    Default Suck It Up

    Quote Originally Posted by VDRIVERACING View Post
    CP - My tanks just have fittings at the bottom/rear of the tanks. I'm curious to know the purpose of the J tubes.
    Im pretty sure to be coastguard approved they have to come out of the top with the J tube, i like to pull out of the bottom, do'nt have to pull the fuel up,IMO more efficient!

  15. #13
    steelcomp was here
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    Quote Originally Posted by VDRIVERACING View Post
    CP - My tanks just have fittings at the bottom/rear of the tanks. I'm curious to know the purpose of the J tubes.
    I know for me it was an access issue...my stainless Russel tanaks were down in the outer sponson so I couldn't get to the bottom, and they were back against the transom so I couldn't get to the back withoug completely relocating the tanks. I just used the stock pick-ups and a single Holley black pump. Fed 800hp just fine.
    If God is your co-pilot, change seats!
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  16. #14
    I'm No Expert Shaun's Avatar
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    Your looking at all the restrictions in the fuel lines... I'm curious what about the needles, what do they flow?

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