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  1. #1

    Default 115hp EFI Fuel Problem

    Thank you in advance. New to the boat forum. I have a 2008 Mercury 115HP EFI. Launched the boat idled over to the dock. Parked the truck, came back tried to start the boat and it wouldn't start. Brought it home an pulled the plugs ad found some raw fuel in cylinder #3 and then pulled #4 plug to have a ton of raw fuel pour out of the cylinder. Pulled all the injectors and cleaned and checked them all good. Put injectors back in and crank over with plugs out. Tons of raw fuel again in #4. nothing in# 3 . I know it isn't the injector, what else can keep putting raw fuel in #4 cylinder? Pulled wires from injector so not to fire off.

  2. #2
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,567

    Default Re: 115hp EFI Fuel Problem

    The injector is stuck open and may need to be replaced. You cannot clean injectors unless you have an injector cleaner.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  3. #3

    Unhappy Re: 115hp EFI Fuel Problem

    Quote Originally Posted by Docksidemarineservices View Post
    The injector is stuck open and may need to be replaced. You cannot clean injectors unless you have an injector cleaner.
    Ok here is part two now.
    Took your advice on stuck injector. I pulled #4 out and swamped it with #1 One of my 3 dry holes
    #1 is still dry and #4 is still dumping raw fuel
    Now where is this fuel coming from??
    When I checked and cleaned these injectors I put them under pressure with cleaner, Fired them off, spray is good and didn't leak.

    Please any ideas will help
    Just confused

  4. #4

    Default Re: 115hp EFI Fuel Problem

    The driver on the computer for the injector is shorted to ground the transistor is damaged and you will need a new one computer that is. Before replacing the computer check to see if the wire coming from the computer to the driver side of the injector is shorted to ground or battery positive as the case may be for triggering the injector.

  5. #5
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,567

    Default Re: 115hp EFI Fuel Problem

    What is the serial number on this engine?
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  6. #6
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    2,581

    Default Re: 115hp EFI Fuel Problem

    Its not a injector or puter problem, the float in VST tank is stuck or has debris under needle causing it to overfill and fuel is dumped back into #4 intake.

  7. #7

    Smile Re: 115hp EFI Fuel Problem

    Quote Originally Posted by faztbullet View Post
    Its not a injector or puter problem, the float in VST tank is stuck or has debris under needle causing it to overfill and fuel is dumped back into #4 intake.
    Bingo !! You are the man!
    I didn't see your reply till I figured it out. But THANK YOU !!!
    You are right. Pulled the vapor hose going to intake ran pump and tried cranking it over
    and along comes the stream of fuel. Right in the intake-flows right into #4 cylinder

    THANK YOU !! THANK YOU!! YOU ROCK!!
    Its all good. Didn't want to be on that crazy lake this weekend any way

  8. #8

    Default Re: 115hp EFI Fuel Problem

    Quote Originally Posted by biesmeyer View Post
    Bingo !! You are the man!
    I didn't see your reply till I figured it out. But THANK YOU !!!
    You are right. Pulled the vapor hose going to intake ran pump and tried cranking it over
    and along comes the stream of fuel. Right in the intake-flows right into #4 cylinder

    THANK YOU !! THANK YOU!! YOU ROCK!!
    Its all good. Didn't want to be on that crazy lake this weekend any way
    Okay after looking this up. Mine doesn't have needle and float.
    It has a pressure regulator and a small piece of hose. There was a service bulletin to replace this piece of hose
    and also the electronic float.
    My piece of hose was cracked due to the ethanol fuel
    Thanks again

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