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  1. K

    Mercury 150 not performing well under load and drinking gas.

    That's an interesting and valid observation, either way ill try to get it running under load. Today I went and got a compression test kit and tested all 6 cylinders and every cylinder had a max compression of almost exactly 100. I'm not sure what is optimal for this engine, but there doesn't...
  2. K

    Mercury 150 not performing well under load and drinking gas.

    I messed with the bulb a fair bit yesterday and when I went back to it had maybe 1/8 of it slack but its majority tight. The oil injection delete was done by the previous owner and he said he did it properly and it all ran right. Ill take a look though. Again, I only got the boat on plane on one...
  3. K

    Mercury 150 not performing well under load and drinking gas.

    Fuel should be fine, I mixed up some 50:1 with 87 yesterday. Filters, I don't even know which to check. I checked the cone fuel filter this morning and it looked pretty much new. No filter in the air cover on the carbs. As for the carbs, I guess I can take 'em all apart and go get some carb dip...
  4. K

    Mercury 150 not performing well under load and drinking gas.

    I sprayed carb cleaner and air through every hole I could and they were all clear. I put them on as I took them off and it runs well in idle out of gear, and it'll take gas as well. As for the gas, I guess you're right, I believe the engine will use some gas. But I believe something else is...
  5. K

    Mercury 150 not performing well under load and drinking gas.

    I located the fuel pump this morning and removed it and inspected the cone shaped filter inside, it was very clean. For the diaphragm, are you referring to the fuel pump assembly where the fuel pump is? there is a fresh gasket on that and it is not leaking. I even put the ears on and let the...
  6. K

    Mercury 150 not performing well under load and drinking gas.

    Appreciate the help locating the welsh plug. Here's some pictures of the numbers and serial number, and a couple of the engine.
  7. K

    Mercury 150 not performing well under load and drinking gas.

    I will get compression numbers tomorrow and for sure get back to this forum, as for the fuel filter contents, I'm not even sure where it is. I know there's a little cylinder that fuel lines connect to beside the carbs but I'm not sure if that's where its located.
  8. K

    Mercury 150 not performing well under load and drinking gas.

    I appreciate the response. I'm not looking to become a professional with these things but I definitely want to learn and get better. I'll go get a compression gauge tomorrow. As for getting an om manual, since you seem very knowledgeable I figure ill ask you a question about identifying my motor...
  9. K

    Mercury 150 not performing well under load and drinking gas.

    Great questions, thanks for the response. My buddy said the timing arm thing was moving with the throttle. The plug wires were jumping to the plugs pretty far, I think they're fine. I haven't been able to check compression yet. The carbs do appear to be completely closed at idle. I assume the...
  10. K

    Mercury 150 not performing well under load and drinking gas.

    It was for a short period of time in the water. The engine would bog out from the ramp, before I ever revved it in neutral.
  11. K

    Mercury 150 not performing well under load and drinking gas.

    I bought a boat with a Mercury 150 Blackmax on it awhile ago, the seller said the carbs needed to be cleaned. Ill save the majority of the story and jump to where I have taken the carbs apart to find they're very clean and floats look and move fine, I've bought new plugs, and ran some seafoam...
  12. K

    Cannot reinstall lower unit on 1990 150 blackmax

    I did use a new white tube with my kit, but I didn't use a new housing for the impeller so I guess it wasn't as stiff as possible.
  13. K

    Cannot reinstall lower unit on 1990 150 blackmax

    First off, thank you all for all the responses. I took all your comments into consideration. The issue my friend and I had that first night, I'm really not sure what is was. I don't think it was a gasket, I think it could have very well been excess grease up there causing a little blockage. That...
  14. K

    Cannot reinstall lower unit on 1990 150 blackmax

    Yes, funny the way you put that.
  15. K

    Cannot reinstall lower unit on 1990 150 blackmax

    no We tried with the motor trimmed up and down.
  16. K

    Cannot reinstall lower unit on 1990 150 blackmax

    I'm hoping people of the internet can save me from this one. My buddy and I changed the water impeller on my Mercury outboard today. Once we went to reinstall the lower unit, we struggled to get everything lined up. We kept trying and got to where there was maybe an inch or two gap between the...
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