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  1. K

    5.0L Merc Oil Drain Hose Diagram Help

    2004 Merc 5.0L MPI, serial # 0W018920 in a 2004 Trophy 2359 I have a static oil leak that loses 4-5 qts when not running. Oil pan hole or drain plug issue seemed like the obvious answer, but I looked at this diagram...
  2. K

    Oil in the bilge

    2004 Merc 5.0L EFI in a Trophy 2359 (Bravo 3 outdrive) I recently turned on my bilge pump and had a nasty sheen of oil appear next to my boat. After investigating the bilge, there is visible oil. My bilge is almost always dry, so I have no idea how long this problem had been going on. After...
  3. K

    2004 5.0L Merc... Tachometer not working

    I'm totally clueless about tach's and how they work. Mine has always worked fine, but now just reads about 800 RPM whether I'm at idle or at WOT, both while moving and while revving out of gear. Is there a sensor somewhere on the engine? Someone said maybe at the alternator? I know...
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    Merc Bravo 3 Anodes... Aluminum?

    So, I found a service bulletin from Merc stating that Alpha, Bravo 1 and Bravo 2 have all changed materials from Zinc to Aluminum Alloy. Does this apply to Bravo 3 as well? I can't find a service bulletin for the Bravo 3. Did this service bulletin come out before the Bravo 3 did? Is there...
  5. K

    Fuel pump shredding..... metal flecks?

    Merc 5.0L MPI, serial # OWO18920 I've recently remedied a bad o-ring that was letting water into my gas tank. Pulled 2 gallons out of the gas tank and another 6 oz from the rail/fuel cooler end. My bogging problems weren't completely fixed, so I checked my fuel pressure today and it's 15-16...
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    Checking fuel pressure

    2004 Merc 5.0L MPI Looking for some advice on checking my fuel pressure. Does anybody know what the psi "should" be in my system? Do I check it at idle? While the boat is under load? Both??? Thanks
  7. K

    Water in the....... EVERYWHERE!!!!!

    2004 Merc 5.0L MPI Pulled about 2 gallons of water out of my tank a few weeks back. Boat ran great for a few trips and then started bogging again. Pulled out another half-gallon of water and replaced the o-ring in my gas cap. Haven't had any water in my separator since, but the boat still...
  8. K

    Fuel Tank Pickup tube clogging?

    I have a 87 gallon Moeller tank in my 2004 Trophy and I'm wondering if it's realistic/possible that the fuel pickup tube could be restricted. Has anybody ever experienced this with this tank? Does anybody know if there is a filter/screen at the bottom end of the pickup tube? I attempted to...
  9. K

    Pumping the throttle......

    2004 Merc 5.0L MPI in a Trophy 2359 She's seriously bogging under load (revs just fine out of gear) and generally will not go above about 2000 rpm or about 10-12 mph. I have found that if I gently feather the throttle up about 100 rpm at a time, I can sometimes get it to go up to 3200 rpm and...
  10. K

    After removing water from the tank

    5.0L MPI Merc After I remove a bunch of water from my tank, how do I go about taking care of the rest of the system? Do I just run the boat to clear any water out of the fuel rail? Do I need to add gas drier? Do I need to run an injector cleaner? Which would be best for this? What...
  11. K

    5.0L MPI Merc, HP fuel pump and filter?

    2004 Merc 5.0L MPI (Engine serial # OWO18920) Engine has been extremely low on power (sometimes, won't even get up on a plane) and seems starved for fuel. If I feather the throttle up gently about 100 rpm at a time, it will get up and go after a few minutes, but is still low on power and will...
  12. K

    5.0L EFI Merc Fuel Pump Number?????

    2004 Merc 5.0L EFI (Engine serial # OWO18920) Pulled off the LP fuel pump today (lacking power, and the pump sounds bad) and went to the boat shop to get a new one. The number on the pump is 861155-4 and below that is the number 0754A. This number doesn't seem to match any part available...
  13. K

    Bogging engine: Corroded Fuel Withdrawl fitting on tank

    2004 Trophy 5.0L MPI Mercruiser Okay, so I have been having major fuel problems for some time now (bogging due to insufficient fuel to the engine) and finally discovered that the fitting on the top of the tank where the fuel comes out to go to the pump (is that called a fuel withdrawal...
  14. K

    Bleeding air out of fuel system?????

    2004 Merc 5.0L MPI I removed about a gallon and a half of water from the fuel tank. Then took out the fuel filter/water separator (oil filter type, without a valve at the bottom to let water out) in order to get the water out of it. Dumped the filter and put it back in. Ran the engine for...
  15. K

    2004 Merc 5.0L MPI bogging under load

    New guy needs help...... 2004 Merc 5.0L MPI Bravo is intermittently bogging down under load. Sometimes it goes just fine, but sometimes I have to shut it off and restart it to make it work. It will generally run up to about 10-15 mph but then starts to sputter and won't go any faster. Twice...
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