Fuel Pump.. Carbureted HP500
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Fuel Pump.. Carbureted HP500

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    Can't re-Member 28Eliminator's Avatar
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    Default Fuel Pump.. Carbureted HP500

    OK.. so last week my Boat decides it apparently isn't happy with the amount of fuel it's getting..

    The boat has 2 saddle tanks with a manual valve I have to switch from tank to tank. On one tank (left side) the boat seems to run fine, takes the throttle good. On the other side tank it dies after it get's on plane. After it sits for a few seconds it starts back up and then runs fine. The vent is not plugged.. I know this because it spews gas all over the side of the boat every time I fill it up . I checked the fuel line and it's fine, but it's a longer pull from that side to the fuel pump.

    Could the FP just be getting weak?? It appears to be the original, as it's still painted Blue. The Boat has 504 hours on it. I've changed the fuel filter/water separator twice so far this year, and I don't see any signs of water in the gas.. WTF, help.

    Need to get it fixed this week, as I have an appointment with a Beach in Havasu on Saturday
    I'd agree with you, but then we would both be wrong

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    my suggestion would be...run the right side tank (the longer hose) 1st & then switch over to the left & see what happens...also...dont run the tank dry before you switch!...leave some gas in the tank/line, so the other tank can flow into it ...just my .02 cents

    FastRat

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    LP-25.com Infomaniac's Avatar
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    Does the fuel pump run off of the sea water pump?

    You need to evaluate the "entire" fuel system starting at the tanks. The "smallest" single component in the system limits how much fuel the engine gets. Tank outlets, the switching valve. hose connections, everything needs looked at. Even tank venting.
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    Can't re-Member 28Eliminator's Avatar
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    Quote Originally Posted by Infomaniac View Post
    Does the fuel pump run off of the sea water pump?

    You need to evaluate the "entire" fuel system starting at the tanks. The "smallest" single component in the system limits how much fuel the engine gets. Tank outlets, the switching valve. hose connections, everything needs looked at. Even tank venting.
    Yes, it runs off the sea water pump.

    I'm gonna take the switching valve out tomorrow night and look at it.
    I'd agree with you, but then we would both be wrong

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    Quote Originally Posted by FastRat View Post
    my suggestion would be...run the right side tank (the longer hose) 1st & then switch over to the left & see what happens...also...dont run the tank dry before you switch!...leave some gas in the tank/line, so the other tank can flow into it ...just my .02 cents

    FastRat
    I've tried it in all different configurations.. Makes no difference. Whenever I run off the Port side tank it does it. It just started doing this about a month ago.
    I'd agree with you, but then we would both be wrong

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    Quote Originally Posted by 28Eliminator View Post
    I've tried it in all different configurations.. Makes no difference. Whenever I run off the Port side tank it does it. It just started doing this about a month ago.
    If you have a electric fuel and a section of clear line you can test the tank pick up. if you have bubbles you have a problem. years ago we had trouble with cracked fuel tank pick up tubes on KW trucks. kind of like a cracked straw in a drink, Be sure the fuel lines aren't dry rotted.
    If you ain't the lead dog the view is always the same !

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    Double check to make sure you are not getting an air leak on the port side plumbing.
    Could be a cracked pickup tube.

    Darrell.
    Last edited by DMOORE; 08-16-2010 at 11:28 PM.
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    The seawater driven pumps take a different size drive arm. I'm trying to think who makes a higher volume pump with that drive. Someone does but I can't remember.
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    cfm
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    Keith Eickert and CpPerformance sell an upgraded housing - bigger valves, inlets/outlets/etc. You replacing the old housing, keep the OE base with arm.

    CV Products also has an upper that transfers over.

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    I see youve come out of your hole.

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    Took the hose off the fuel selector switch going to the "Suspect Tank" and tried to blow through it... No go. Took off the side going to the good tank and I can blow through it fine. So I follow the line all the way to the tank, undo the hose, then take off the barbed fitting going into the tank. The fitting has a ball check valve in it, and I can barely suck through the damn thing... Why does it need the check valve?? It's obviously a big restriction in the line.. The other side tank doesn't have one..
    I'd agree with you, but then we would both be wrong

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    Quote Originally Posted by 28Eliminator View Post
    Took the hose off the fuel selector switch going to the "Suspect Tank" and tried to blow through it... No go. Took off the side going to the good tank and I can blow through it fine. So I follow the line all the way to the tank, undo the hose, then take off the barbed fitting going into the tank. The fitting has a ball check valve in it, and I can barely suck through the damn thing... Why does it need the check valve?? It's obviously a big restriction in the line.. The other side tank doesn't have one..
    Anti-siphon valve its required by the coast guard
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    Quote Originally Posted by BigSteve View Post
    Anti-siphon valve its required by the coast guard
    That is correct, however, it's the source of many fuel supply issues. Pretty standard fair to remove this even in the I/O world with enclosed compartments.

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    Quote Originally Posted by Vortecpro View Post
    I see youve come out of your hole.
    Yes, to help people with problems. Some of us have some hands on knowledge of boats.

    Have any help or knowledge to share with this thread ?

    Or just personal comments ?

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