Constant problems with w/ bad gas

Discussion in 'Outboard Maintenance' started by Copperspoonfly, Jan 19, 2017.

  1. Flat Mad

    Flat Mad Active Member

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    I put over 4K hrs. on a 250 hpdi all on E10.I used MARINE FORMULA STABLE religiously.Never had a fuel problem.Back on the flats with Yamaha F 70 .I us E10 and stable have not had any issues.when I change the spin on never any water.Yamaha says E10 is OK.
     
  2. predacious

    predacious Active Member

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    there's never any water in the separator,because you're not getting any water in your fuel system....
     
    Flat Mad likes this.

  3. State fish rob

    State fish rob Active Member

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    E10 has a 21 day shelf life. Run my small outboards dry. I use
    stabil 360 in every thing that burns gas.
     
  4. predacious

    predacious Active Member

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    if this was true - the amount of fuel problems people would be experiencing would be incredible....
     
  5. State fish rob

    State fish rob Active Member

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    Nothing but trouble in nc w e10 and carbureted engines. Efi engines dont have as much trouble,fuel system under more pressure. Glad youve had no trouble......
     
  6. Flat Mad

    Flat Mad Active Member

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    I have a 50Hp 2 stroke Yamaha 10.years old broken in on E10 have run nothing else with MARINE FORMULA STABLE use west marine 2 stroke oil from day one.It gets a can of Mercury Power tune once a year. This engine is still strong.
     
  7. predacious

    predacious Active Member

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    please,explain this to me ?
     
  8. State fish rob

    State fish rob Active Member

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    It was explained to me by a evinrude service mechanic that carbureted engine fuel systems are under less pressure than fuel injected systems this is why folks ran a fuel pressure regulators on some caburated systems.
    As for the 21 day shelf life , this is when the fuel begins to break down. No einstein here , just passing on food for thought
     
    Last edited: Apr 23, 2017 at 7:34 AM
  9. predacious

    predacious Active Member

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    Fuel is delivered to the motor from the fuel tank - not under pressure

    You realize that,yes ??
     
  10. Smackdaddy53

    Smackdaddy53 Zephyr Cove is on FIRE!

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    How's that? The fuel pump pulls gas from the tank to the carbs, if there were no pressure how would the fuel flow uphill to the motor? Even if it were a gravity feed system there would be some pressure.
     
    State fish rob likes this.
  11. State fish rob

    State fish rob Active Member

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    Unless your fuel tank is above your engine ie:lawnmowers , your fuel system is under pressure
    How much pressure it depends on the engines ,I understand mercury EFI pushes about nine psi for the fuel injectors
    Pretty sure squeezing bulb on fuel line is creating pressure somewhere
     
    Smackdaddy53 likes this.
  12. Smackdaddy53

    Smackdaddy53 Zephyr Cove is on FIRE!

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    The primer bulb does just that. It gets fuel primed through the fuel pump all the way to the carbs or EFI through the fuel pump and once the motor turns the fuel pump takes over.
     
    State fish rob likes this.
  13. predacious

    predacious Active Member

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    you do realize,withdrawling fuel - that's negative pressure - vacuum

    fuel pressure comes in on the output side of the pump - understand ?

    fuel pumps - one side is intake,suck side...other side is output,pressure

    get it ??

    primer ball - you squeeze it,it sucks on one end,and pushes fuel out the other side...
     
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  14. State fish rob

    State fish rob Active Member

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    Smackdaddy53 likes this.
  15. Smackdaddy53

    Smackdaddy53 Zephyr Cove is on FIRE!

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    What pushes the fuel? PRESSURE!
    Get it?
     
    State fish rob likes this.
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