Stumbling..
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Stumbling..

  1. #1
    I'm No Expert Shaun's Avatar
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    Default Stumbling..

    Took the boat out a few weeks ago and when standing on the throttle to get some speed runs the motor would start to stumble after a little bit. If i let off for a few seconds and jump back on it it would stay strong but then again start to stumble. I think i'm sucking the bowl's dry? I'm thinking i need to reset my float level because when i had the needle seat problem i dropped the bowl all the way down and when i reset them i was on the trailer and not on the water so they might be a bit low. Also i'm only seeing 4.5 lbs of fuel pressure, maybe this isnt enough to fill the bowls? I used to be able to get 8lbs of pressure out of this thing but now for some reason i try to turn the pressure reg up and i cant. I'm wondering if i'm sucking air... My pump is brand new, it's a mallory marine 110 pump.

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  3. #2
    Senior Member ol guy's Avatar
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    Quote Originally Posted by Shaun View Post
    Took the boat out a few weeks ago and when standing on the throttle to get some speed runs the motor would start to stumble after a little bit. If i let off for a few seconds and jump back on it it would stay strong but then again start to stumble. I think i'm sucking the bowl's dry? I'm thinking i need to reset my float level because when i had the needle seat problem i dropped the bowl all the way down and when i reset them i was on the trailer and not on the water so they might be a bit low. Also i'm only seeing 4.5 lbs of fuel pressure, maybe this isnt enough to fill the bowls? I used to be able to get 8lbs of pressure out of this thing but now for some reason i try to turn the pressure reg up and i cant. I'm wondering if i'm sucking air... My pump is brand new, it's a mallory marine 110 pump.
    Shaun, could be being sucked into submission.(Don,t we men wish we all were) what I mean is maybe your'e tanks aren't allowing enough air in to let the pump work? Pop the tank caps and try it again while being careful to not allow water to get into said tanks. In some way you have a restiction of feul flow, the pressure gauge may read fine but the motor is starving to death. M

  4. #3
    Cantard 71hallett's Avatar
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    What ol guy said sounds right. Float level would make this happen realy quickly.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Or Seth, either one Budweiser's Avatar
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    Hark, and what of your fuel filter? Have thou replacethed?

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    I'm No Expert Shaun's Avatar
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    Fuel filter is one of those serierra water seperator/filters... the ones that look like a oil filter.

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    Or Seth, either one Budweiser's Avatar
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    Quote Originally Posted by Shaun View Post
    Fuel filter is one of those serierra water seperator/filters... the ones that look like a oil filter.
    And... Have you replaced it since you've had this problem?

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    Senior Member Brendellajet's Avatar
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    or atleast drain it(if it has the petcock on it...)

  10. #8
    I'm No Expert Shaun's Avatar
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    it's new, maybe has 4 gas fill ups on it (100gl total ran through it) and 3 of those are from my last trip and it started the first day so it had maybe 20gl ran through it tops. I never fill up on the water, always pull out and drive to a local gas station.

  11. #9
    TJS
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    Nice boat build up by the way. Set the floats, pres should be around 5 or 6. Also the vent idea is good. I am running a seperate vent system this year, I do not trust the flip caps internal venting. I am also running larger pickups in the tanks. I modded them extensivley. See my other post. Are your tanks new. Also what hull do you have.
    T.J.

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    Default By pass???

    Are you running a pressure by pass back to the tank?.....Dead heading the pressure MAY over heat the fuel pump as it pounds the same fuel around in the pump....The regulator should have a by pass port, plumb it back into the tank and allow the excess fuel to move through, set the pressure while by passing...........MP
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  13. #11
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by Moneypit View Post
    Are you running a pressure by pass back to the tank?.....Dead heading the pressure MAY over heat the fuel pump as it pounds the same fuel around in the pump....The regulator should have a by pass port, plumb it back into the tank and allow the excess fuel to move through, set the pressure while by passing...........MP
    No, just running a $30 holley regulator. One of those chrome deals with a IN at the bottom and two feeds, one off each side. It's not the kind that returns fuel. This pump i beleive says a pressure regulator is optional and having the pump go straight into the carbs would be the same thing as hitting a reg (in regards to dead heading the pump) wouldnt it?

    I think a pressure bypass is a better idea though, i wanted to go that route but i was in a hurry trying to get things back together for a river trip and the reg was all i could find local. I'll probably convert over to that but first i'm going to by pass the reg and see what my pressure looks like.

  14. #12
    gn7
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    shaun if your needles are in good shape you can go as hi as 7psi with zero trouble, make absolutely certain you floats are set with the sec. a little on the hi side, I run mine with the level almost to the top of sight hole. You may be uncovering the jets and/or powervalve(if equipped) on the sec.



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  15. #13
    I'm No Expert Shaun's Avatar
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    Welp, went out to wrench on the boat and started with the pressure problem. Turned the key to on and got 6.5 lbs of pressure. Thought that was weird because last time i had 4-5 and i had not made any adjustments. I start messing with the regulator and the guage isnt moving, it's reading the same pressure so i'm thinking this regulator is broken, then i hear the pump start going faster and slower and then it stops. Now the pump is not spinning, i havnt pulled it out yet to see wtf happened but my guess is my problems are with the pump. This pisses me off because this f'ing pump wasnt cheap, the last one i had ran for 10+ years and was the 110 but the non marine version. Anyway, think i found the problem...

    Whats a good electric pump, i dont have a cutout in my motor plate so i cant run a mec fuel pump?

  16. #14
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    Shean, I have heard lots of stories of the Holley pumps failing, with very little time on them. Tyr Aeroquip.


    Darrell.
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