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  1. W

    5.0 mpi backfiring through exhaust. Won’t start

    Boost pump is the second fuel pump before the water separating filter? Are both fuel pumps the same or different models?
  2. W

    5.0 mpi backfiring through exhaust. Won’t start

    Serial number is in original post. I’ll verify firing order. Previous owner has a history of buying boats to fix then not Being able to do the work and reselling.
  3. W

    5.0 mpi backfiring through exhaust. Won’t start

    New cap and rotor. Actually tried 2 new sets so far. No change.
  4. W

    5.0 mpi backfiring through exhaust. Won’t start

    Engine serial number is m367508 2005 5.0 mpi Working on my new boat and the port engine is giving me trouble. Finally got gas to it and it sounds like it wants to start but only backfires through the exhaust periodically. My question is if this would be a possible symptom of spinning the motor...
  5. W

    5.0 mpi runs rough when wet

    Can’t seem to track this down but noticed when the engine gets wet it runs rough. Low power, poor fuel mileage. Checked plugs, wires, cap and rotor replaced twice. Good fuel. Clean filter. When I left the engine cover off and let everything completely dry for a few days it was able to run 20...
  6. W

    Bravo air operated drain.

    Here is one of the serial numbers. This motor is marked as manufactured in 2005 on the ecu board. The second one is missing the tag. It’s labeled as manufactured 2002 on the ecu. Any other way to get the serial number? I actually need it for my insurance policy. The only noticeable difference...
  7. W

    Bravo air operated drain.

    Where can I find the serial number? The numbers on the plastic cover are gone.
  8. W

    Bravo air operated drain.

    I mean the in and out on the pump. Just the water lines. I can get the back plate for the pump without that air operated valve. Just wanted to be sure it wasn’t real important.
  9. W

    Bravo air operated drain.

    One of my engines on the new boat has this cylinder with air lines as part of the water pump. I broke the top line off removing it. Can I delete this system. My other engine just has the 2 water lines on the back. What’s the purpose of this system?
  10. W

    Bravo 2 water pump impeller

    Thanks for all the info. I’ll try to get serial numbers. Motors are 2005 according to the stickers on the ecu plates. Boat is a 95. So not original to the boat. I gambled I purchased in non running condition. I’m confident I can make them run. Just my other boat is an alpha drive with the raw...
  11. W

    Bravo 2 water pump impeller

    Thanks. So the water pump mounted to the bottom left of my engine serves the same purpose as the impeller in the alpha drive. then it also has the circulation pump that is part of the motor. These also have the closed cooling system. Not sure that’s the correct term but it’s got a sort of heat...
  12. W

    Bravo 2 water pump impeller

    So I just purchased a boat with twin 5.0 mpi engines with bravo drives. My other boat has the same engine with an alpha one. Does the bravo drive have an internal impeller like the alpha one or is it just the water pump on the engine that needs service? What differences are there between the...
  13. W

    350 mercruiser stalling when shifted into gear

    My other boat project is giving me trouble. Got it running with help from here but now it shuts down when I go to shift it into gear. It’s a mercruiser 350 with the 2 barrel carb. Alpha one gen one drive. That’s all the info I currently have on this one. This is being tested on the hose in the...
  14. W

    5.0 mpi bogging and backfiring at high rpm

    Had my boat out for an offshore fishing trip. Ran 50 miles out no issue. Coming back about halfway it started dropping rpms and backfiring. It would then run ok for a bit then do it again. Then it cleared up and ran the last 15 miles with no issues. Fuel filter was good with no water or other...
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    Fuel pump issues

    This forum is great. Found the switch. It was previously bypassed and had recently corroded off from inside the connector. I stripped them and connected together and it started right up. So went to the marina to get the switch to put it back together correctly. Was told just to connect the wires...
  16. W

    Fuel pump issues

    Ok. So if I’m understanding this corrrctly I should read no voltage with the key on not running at the pump. I get 7 volts as I’m cranking it over so it drops. I gotta remove the exhaust from the port side to check out the oil pressure switch. Before I go that far is there anything else I should...
  17. W

    Fuel pump issues

    Agreed. And he was warned. I’m not a volunteer though. I’m getting paid for my time. I’ve basically rebuilt my entire boat so I’m familiar with a lot of the systems. Mine is a good bit newer though.
  18. W

    Fuel pump issues

    I tested the power at the harness with the pump disconnected. Key on 9 volts. Before it shut down the pump pressurized with the key on. Now nothing. Thanks for the diagram. I’ll trace the wiring back.
  19. W

    Fuel pump issues

    So I’m helping someone with their new “free” boat. It’s a late 80’s model with a merc 350 with the thunderbolt v ignition and gen one alpha one drive. I can’t read the serial number anymore. Problem is that it started pretty readily after a tuneup and fluid change. Let it run a bit and it died...
  20. W

    Mercury wear pads missing cause of vibration?

    Sorry. Been away. Alignment was checked last time the drive was off with the proper tool. Slid in and out perfectly. I have so far bought an almost complete set of tools to work on this boat. Lol.
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