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  1. L

    2006 merc 40 4 stroke

    Well I took off the lower end and behold the pump gasket was blown out! Replaced it. Also installed the new high pressure pump in the evaporator. Turned the key and the fuel cooler on the side sprayed out fuel. Took it apart and noticed the orings were hard. Went to auto zone bought a small...
  2. L

    2006 merc 40 4 stroke

    Looks like it fits the tiny hole in the pump intake.
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    2006 merc 40 4 stroke

    I changed the thermostat and still not the fix. I took off the high pressure pump and the screen was covered in small particles. Cleaned the screen. I took out the rubber plug the pump slides into and found this? It was in the hole just laying in there? Does it go in the pump? The Schrader valve...
  4. L

    2006 merc 40 4 stroke

    I'll give it a shot. I put the thermostat in hot water again and it opened at 160-170. Could that do it? It's a 140deg thermostat. I ordered one anyway. Thanks for the advice!
  5. L

    2006 merc 40 4 stroke

    Has anyone ever had an exhaust leak? Was wondering if it's possible for a leak to build up inside the cowling and cause it to lose power, then with the cowling off it runs fine ? Ever hear of it?
  6. L

    2006 merc 40 4 stroke

    Great idea. Thanks!
  7. L

    2006 merc 40 4 stroke

    Well I'll change the high pressure pump and check the screen when I get it back to NJ. I took it out of the water and put the travel cover on it. I'm just shooting from the hip without proper test equipment. Frustrating. Thank you all for the ideas. This is a great site. When I finally fix it I...
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    2006 merc 40 4 stroke

    With the cowling off I burnt my finger on it. About the same time the garmin gps shut off. So the new one still gets hot. I saw a post on line with symptoms of a bad voltage regulator and one was a rough running engine.
  9. L

    2006 merc 40 4 stroke

    Not that I can see. Nothing pinched.
  10. L

    2006 merc 40 4 stroke

    1c015210
  11. L

    2006 merc 40 4 stroke

    I checked that. Nothing shorting.
  12. L

    2006 merc 40 4 stroke

    Well I replaced the voltage regulator. No good. Took the cover off and drove home 40 mins. Took the thermostat off and it tested fine. What else? The Electronic control assy? I didn't replace the coils yet. Man runs so good with the cover off. Thinking about making a nice scoop on the front. Lol
  13. L

    2006 merc 40 4 stroke

    Wow I was thinking that today. It was running fine last year. I changed the plugs did a oil change. Well I got to the third plug and changed it. Took it for a ride and fine for about 35 mins. So took the cowl off and ran fine going home. I felt the voltage regulator and burned my finger. I...
  14. L

    2006 merc 40 4 stroke

    Thanks for the ideas. I'm gonna try and replace the lower spark plug. 3 cyl. Couldn't get to it without removing the coils. When the issue happens I can't bring the power up. Idle only and it breaks up every 20 seconds then idles ok and I have to work the throttle. I limp home. Yesterday I took...
  15. L

    2006 merc 40 4 stroke

    I have, no difference. Seems the bulb is always soft. I replaced the the fuel pump. Also the fuel line from the tank. It runs fine with the cowling off I found out. Guess something is breaking down. Coils? Idle control valve? Might replace them next.
  16. L

    2006 merc 40 4 stroke

    Each time I take my boat out it runs great for the first 35 mins. After I throttle back and idle around it starts to want to stall out. If it does and I restart it idles fine for 5 mins then same issue. Changed tank fuel line and connectors, fuel filters, oil/filter, plugs. Can the idle air...
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