Logo
FULL SITE MENU

Recent content by boatjohn75

  1. B

    Mercury/Tohatsu 20HP EFI Power Loss (Low Pressure Fuel Pump?)

    Thanks. Would this leak be visible? Everything looks dry. Where is this O-ring on a hose (ends?)? Do you mean the primer bulb or the hose after the bulb that leads to the fuel/water separator?
  2. B

    Mercury/Tohatsu 20HP EFI Power Loss (Low Pressure Fuel Pump?)

    I have a 20 HP Mercury EFI (it's a Tohatsu) that looses power at high RPM. It started intermittently, initially only struggling after running full RPM and heat soaking the engine, and would recover. Now (after a year of this), it's happening all the time. At full RPM, it bogs down (revs down...
  3. B

    2022 Mercury 20 HP EFI outboard intermittent power loss (maybe after insulating cover)?

    At this point, I changed plugs, coil, TMAP sensor, same issue. Seems to be getting more frequent. Anybody else ran into this?
  4. B

    2022 Mercury 20 HP EFI outboard intermittent power loss (maybe after insulating cover)?

    Update: I removed the insulation and problem remains. Engine ran fine for over an hour at WOT, then stopped for 30 minutes (at this point I assume the heat built up), and upon start and WOT, it had the same power loss for a few minutes until it recovered (again assuming because of the great...
  5. B

    2022 Mercucy 20 HP EFI outboard Engine Guardian "beep" on shutdown (nothing in manual)?

    I have an intermittent power issue with 2022 Mercury 20 HP EFI (post), but also noticed a beep from the "Engine Guardian System" when turning off the engine. I know there are different beeps for indicating conditions (including the beep on start), but I hear a beep when I turn the ignition off...
  6. B

    2022 Mercury 20 HP EFI outboard intermittent power loss (maybe after insulating cover)?

    I have a Mercury 20 HP EFI to which I decided to add some automotive sound deadening insulation (4-5mm thick) on the inside of the top cover. After this installation, the engine stumbles and loses power when running for about 30-45 minutes at higher settings (e.g. 4500+ RPM). If I let the engine...
  7. B

    ECU Swap on Mercury 9.9 EFI ProKicker to 15?

    So I bought a small pontoon with a 9.9 EFI ProKicker because I was going to use it on a 10 HP limited lake (trailering). Instead, I ended up on a 20 HP limited lake (wet slip), and wish I had a bit more power. The 9.9 and 15 EFI seem identical, except for, I assume the ECU. How hard would it be...
  8. B

    ECU for ProKicker 9.9 to 20 HP?

    CORRECTION: 15 not 20 I see vague mentions that converting a Mercury 9.9 EFI ProKicker to 15 (most recent model years, 2021/2022) may be possible by swapping the engine computer? Is this true? If so, can someone point to part numbers? Has anyone successfully done this?
See more
Back
Top