Recent content by Jeff J

  1. J

    pdf service manuals

    I keep my pdf files on my phone or tablet so no need to print and carry pages to the shop. Most of my manuals are paper and live in the shop but I have some Mercury, Yamaha and Volvo on my phone.
  2. J

    Water in the fuel

    The same thing as the cap on a lawnmower. The vent is covered by the outer cap.
  3. J

    Water in the fuel

    Condensation in a boat fuel tank isn’t any different than condensation in any other fuel tank or can. The easiest way to prevent condensation is to minimize the amount of air in the tank. I know one of the outboards (2018 Monterey) has a vented cap. It’s all I could find to fit the threads in...
  4. J

    Water in the fuel

    Fuel supply okay. 16 boats running on the same supply. I would be seeing more problems across the fleet if not. Not sure on gas cap but I think it’s original to the boat (2017).
  5. J

    Water in the fuel

    I was called to the dock today to look at a 2017 Monterey that wouldn’t make power but start and idle okay. I automatically pulled the fuel filter and it was clogged with a pale slime and full of water so the engine mystery is solved but fuel filter only had 6 hours use. Where did all of the...
  6. J

    50hp EFI diaphragm fuel pump pressure

    I am sending the boat back today. The new mercury lift pump is putting out 3-4 psi which matches the old pump except for the needle on the gauge is steady now. I attempted to order a manual for this motor through ebay but it got cancelled an hour after I paid for it. The vendor’s canned excuse...
  7. J

    2006 merc 40 4 stroke

    I think buy a basic fuel injection test kit for ~$45 before spending $600 on a high pressure fuel pump that may or may not be needed. https://www.harborfreight.com/basic-fuel-injection-service-kit-64939.html
  8. J

    50hp EFI diaphragm fuel pump pressure

    The Yamaha F70 service manual.
  9. J

    2006 merc 40 4 stroke

    A cautionary tale about spark plugs. My Yamaha ran me in circles a couple of years ago. Plugs spark tested okay on the boat so I kept looking. I finally circled back to spark plugs but put them on a tester with a pressure chamber. One quit firing as soon as the pressure got to 5 psi. I spent...
  10. J

    2006 merc 40 4 stroke

    Idle control valve issues I have seen only affect idle. There is one on a 150 hp in the fleet I clean twice a season. Coils could be breaking down and causing problem when warmed up. Anything electrical can have heat related failures. Assuming it’s an EFI, the high pressure fuel pump comes...
  11. J

    50hp EFI diaphragm fuel pump pressure

    42 psi range would be for the high pressure pump sending fuel to the injectors. I am looking for the pressure going into the VST. It’s 19 psi on my 70HP Yamaha.
  12. J

    2006 merc 40 4 stroke

    Have you tried pumping the primer bulb to see if that brings power back?
  13. J

    50hp EFI diaphragm fuel pump pressure

    A friend asked me to look at his 2006 Mercury 50hp EFI. Motor runs okay as long as someone pumps the primer bulb every few minutes. I think I have the problem isolated to the diaphragm pump but would like to confirm how much fuel pressure it should be producing. I am seeing less than 4 psi on...
  14. J

    Service manual for 7.5 HP

    Thanks for the heads up.
  15. J

    Service manual for 7.5 HP

    Just parts to overhaul a carb, water pump parts and a throttle lever. Maybe a couple of other miscellaneous items. All available so far. I can probably get them at my local Mercury shop in Oklahoma but a lot of the time it is faster and more economical to order the stuff online. I have to look...
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