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Mercury 15 leaking fuel wont start

Mercury marine boat motor 15 hp

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  • Master
  • 1,190 Answers

Where is fuel leaking from ? give me past history how it came to not starting ! carb clean ? sparking at the plugs ? compressions ok ?

Posted on May 12, 2014


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Posted on Jan 02, 2017

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SOURCE: 1999 Mercury Mariner 9.9hp outboard motor

should be on the side with a lever but could you give me more info please

Posted on Jun 27, 2009

  • 53 Answers

SOURCE: Yamaha 115hp 2 stroke Outboard Boat Motor. Went

is it carbureted or fuel injected? are your warning horns working? if it iscarbureted then a few easy test can be done to find out. if its fuel injected then its a little harder but not impossible.(1) check compression. without the year model I'm giving you a average numbers. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark fuel is the problem nine times out of ten. clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under the engine coul. take it to the lake if no improvement. clean carbs. same test to be and fuel system service used of fuel injected engines. if no improvement in engine preformance then you will have to take it to a dealer to test with computer.

Posted on Nov 01, 2009

  • 583 Answers

SOURCE: I have a 15 hp 2 stroke mercury outboard. When I

it is getting flooded ,dont ask me why, as im not there to check it out but if when first prmeing you stop pressing the bulb as soon as you feel any pressure at all, you will probably find it will start up straight away

Posted on Jan 17, 2010

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SOURCE: how to clean boat carburetor

Carburetors are tricky, They have to be completely dismantled, soaked in carb cleaner, make sure all the gunk is off, every jet clean and clear, If you can't get a wire through it, you won't get gas through it, make sure you can blow through it, Get some guitar strings, .009 is about the smallest guitar string you will find, you can buy them separately at the music store if you don't have one. Change the filter in the line, when the carbs go back on, the adj all have to be the same, not one wide open and 2 idleing, Float level is also important, they don't sell complete kits anymore, you have to buy the parts individually, gaskets , etc, good luck.

Posted on Feb 14, 2010

  • 95 Answers

SOURCE: outboard motor won't run under load

I have 1969 5hp Johnson. Starts and runs good, but will only push a 14ft row boat slow at low to medium rpm. When at higher rpm the the motor just revs up and the boat slows down to almost nothing just like it has seaweed around prop.Any help would be great.

Posted on Mar 13, 2010

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May I use higher octane unleaded fuel in this engine? (Say, 97 or 98 octane).

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Certainly you can. We use mid-grade or supreme in our Honda 15 outboard all the time. If the higher octane isn't needed, no harm done. After all, with a boat motor, it's working hard all the time and the higher octane certainly can't hurt.

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I have a 15 hp 2 stroke mercury outboard. When I prime the fuel bulb it takes ages for the motor to start .If I disconnect the fuel lead a back pressure of fuel spurts back at the fuel connection to the...

it is getting flooded ,dont ask me why, as im not there to check it out but if when first prmeing you stop pressing the bulb as soon as you feel any pressure at all, you will probably find it will start up straight away

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