What the FU--!
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What the FU--!

  1. #1
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    Default What the FU--!

    Last time I had my boat out, it started to run fat [rich[. I checked the float levels ,mag , changed jets [92 to 90] primary. Still runs fat. Only difference was I was running fuel mix 50% race 110 gas and 91 octane. Last time I filled up with straight 100ll from Parker oil in Parker, AZ. Fuel pressure went from 7 !/2 - 8 lbs to 12 psi on both fuel pressure regulators. Bad fuel????? Pat

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  3. #2
    TRG
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    parker oil did me dirty ONCE!...there wont be a second time!

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    Driver 78CoLeBBF's Avatar
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    def sounds like junk in the regulator
    Its a FORD thing chevy's arent quick enough to understand

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    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by toddnjuzz View Post
    parker oil did me dirty ONCE!...there wont be a second time!
    x2

    Also, remember that when you change your fuel, your specific gravity changes ... as that changes, the density of the fuel changes (just like oil viscosity). Your pressures will change if the specific gravity changes (just like if you ahve thin oil vs. thick oil)

    Just something to think about.

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    Quote Originally Posted by 78CoLeBBF View Post
    def sounds like junk in the regulator
    I have 2 regulators, funny both jumped up 4 1/2 lbs.

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    Quote Originally Posted by BUSBY View Post
    x2

    Also, remember that when you change your fuel, your specific gravity changes ... as that changes, the density of the fuel changes (just like oil viscosity). Your pressures will change if the specific gravity changes (just like if you ahve thin oil vs. thick oil)

    Just something to think about.
    I used to run 100ll in my old boat for years. It always burned cleaner on avgas. I put some different fuel in last nite, will run it today and see.

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    Well I was right! Parker oil sold me a load of bad 100ll. I guess it's time to cross them off my fueling stations. Sure causes a headache to figure out. Lets start a thread listing where peeps got bad gas so we don't go there. Pat

  10. #8
    I'm No Expert Shaun's Avatar
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    maybe your fuel pump is wacked out. Happened to me, pump was mounted alittle too low and water was getting on the pump, i think i ended up submerging the pump alittle bit. Anyway, my electric pump has a small pin hole i suppose to let the bearing breath? Water got in there, bearing rusted. I ended up having odd fuel pressure, seamed to be different every time i ran the boat. Pump ended up locking up...

    Weird because you think junk being in my pump bearing would give me low pressure, i ended up getting high (9-10lbs) and low (4lbs) readings. My pump has a internal bypass, maybe it was getting stuck too, i rebuild the pump and it seams good now, it runs at 7lbs with out a reg. pump is a mallory 110 marine pump.

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    Pat I had a similar problem last year. Boat would run fine from my house in needles to AVI where I would make the turn and it would load up and flood out. I could barely keep it at an idle. I replaced needle and seats twice, again on short runs it was fine. Had carb rebuilt by Proffesional. Again ran beatiful on short runs and failed on the AVI turn.

    I then removed the engine cover and started monitoring the fuel pressure. When it would fail the pressure would jump to 14lbs. I was running a factory style Carter 100 gallon per hour supposedly self regulated. I replaced it and have had no problems since.

    After replacing the fuel pump I noticed that the voltage after running would creep up to 13 or 14 volts. I am using dual batteries in my cruiser and would leave them both on while running. I then had a battery failure and replaced only one and the voltage now does not typically read over 12.

    Of course this was noticed after the old fuel pump was dissected and long gone. My assumption (you know what that makes me) was that the higher voltage may have caused the fuel pump to spin at higher speed and cause the higher pressure. When I took what I could apart on the old fuel pump all it looks like is a 3 rotor impellor and I could not see any kind of regulator. So I am not sure if voltage regulates the speed of motor that drives the impeller. Just more food for thought. I hope putting in different fuel solved your problem as I thought mine was fixed more than once.

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    My fuel pump is a edelbrock mechanical pump 130 gph I think

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    AV Gas has glycol (anti-freeze) in it so it wont freeze-up the carbs in planes at higher altitudes if you have been running it all summer and not had a problem it may be due to higher levels of glycol and manganese being put in the fuel for the winter months as busby stated different fuels have different specific gravity adding more chemicals to these fuels would change that therefore causing tune-up problems IMO I would not use avgas for 1 its too dry and for 2 its too inconsistent meaning the (blends)

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    Well that proves the old saying about assumptions.

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