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  1. ESGWheel

    Starter Not Engaging

    again, please do not try a jumper cables directly to the starter, only to the battery... thx
  2. ESGWheel

    Starter Not Engaging

    Our posting crossed. OK so no voltage at the Y/R wire so troubleshoting time. If desired, you can “jump” from the POS battery terminal to this terminal to check the rest of the system (starter works, and if does good connections exist). Make yourself a jumper wire (same size wire as the Y/R)...
  3. ESGWheel

    Starter Not Engaging

    DO NOT use a battery charger to try to start the engine. Only specialty equipped chargers can handle that type of current (read: professional grade for garages). If you have one that claims will start an engine (Start Mode) I suspect that it’s like one of those battery jump starters and may work...
  4. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Agree to not cut into metal fuel lines > again I was thinking u had mechanical and thus rubber hose feed. Take a look at your set up and see if there is an easy way to test fuel pressure. Regardless, yes, you can get a cheap fuel pump and try that and if all works out decide if you get a second...
  5. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    With the carb'ed engine i assumed. So yes those can go. Need pressure gauge.
  6. ESGWheel

    Rough idle and dies when put in gear

    Agree tough to believe in coincidences. One possibility is the dist cap got smacked and has a crack causing it to intermittently short out so not running on all 8, or an ign wire got damaged. When at the boat and idling, run your hand around the dist and along the plug wires. Get a tingle or...
  7. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    No water > good. And yes the correct process. I was going with it only stubbles underway and only at 3k and only occasionally which was really odd. And yes, this does sound like a fuel issue, but where? While it’s possible to be the fuel pump, these mechanical devices typically outlast the...
  8. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Well that does change things. Was this on the muffs or in the water and underway (i.e. under a load)? Do you own a fuel pressure gauge? If not time to buy one. Something like this: link That way you can put in line and monitor as part of the troubleshooting. And also see Scott's post 10...
  9. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Forgot to mention > the plugs look fine.
  10. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    I would think that water in fuel would cause stumbling at any / various RPMs, no? Since only at 3k and intermittent is why I came out of left field that something seems, well, out of balance at that specific RPM Trying to continue to learn so I can help… thanks.
  11. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Checking / replacing filters should be part of yearly maintenance including this one If this filter was clogged you would have issues at more than just 3k If u are not comfortable rebuilding the carb which, I think is the next step, you can look into getting a rebuilt or new carb as it’s...
  12. ESGWheel

    Rough idle and dies when put in gear

    And the other questions please incl bondo’s Thx
  13. ESGWheel

    Rough idle and dies when put in gear

    From the limited info it sounds like you are occasionally running on less than 8 cylinders which could easily be ign. related (example: spark wire shorting out). So need more info like: Conditions under which is runs rough like cold or warmed up What RPM are you seeing when idling rough What...
  14. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    In addition to the above something else to consider is making sure the entire air pathway is clear and free to flow. Here is the thinking: an internal combustion engine is really an air pump. Problematic air flow dynamics can come into play at one RPM but not another. In a boat motor, that is...
  15. ESGWheel

    previously posted about intake manifold backfire in my 1996 Volvo Penta 5.8L ford 351 Winsor. Having a complete engine rebuilt. Heads rebuilt twice.

    It requires a tool (about $100, link) and an air compressor. If you do not have a compressor would be best to take it somewhere to do this. But if u do, even a smallish pancake compressor used for nail guns would work. Do u have one? Also, the results can be a little tricky to interpret. The...
  16. ESGWheel

    Starter Not Engaging

    I get what you are hoping for, but I can only offer a logical troubleshooting guide. While new ensure the battery is fully charged. Make sure all battery and starter connections are clean and tight. This means removing them and using a wire brush, etc. to all nice and bright. And it includes...
  17. ESGWheel

    Mercruiser 120 poor starting

    The test he conducted was to look for a squirt of the accelerator pump post cranking the engine, and he saw none. Hence the next step of validating getting fuel to the carb and then he took it to the next step to pull off the top. It’s been decades since I have been on the inside of a carb so I...
  18. ESGWheel

    Mercruiser 120 poor starting

    Boy I am exercising my memory cells now. The Power Piston No. 33 in the picture is meant to be ‘floating’ and not locked in. It’s a device that will move up and down in response to differential air pressure vs. the spring pressure. It’s used to enrich the fuel mixture under load. So, it does not...
  19. ESGWheel

    Mercruiser 120 poor starting

    Great! You are getting gas to the carb! But looks like the carb is not filling up. The fuel level seems too low. See my blown-up picture of your picture. Note the Accelerator Pump bowl gets fed with the slot down the side of the bowl. I would expect the level to be somewhere around the line I...
  20. ESGWheel

    5.0 GXi-J fuel pump relay keeps tripping

    I have been delayed de-winterizing my boat due to medical issues. I hope to get to it in the next couple of weeks…
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