1975 9.9 Johnson Seahorse - SLOW

[trashcanslam]

UPDATE: the problem was fixed by replacing the spark plugs!!! Many thanks to everyone for your help and insight.

A new problem occurred which involves surging and dying after running in WOT after about 60 seconds. However, i pumped the primer bulb manually and the problem subsided. Repeated this until I got back to the boat ramp. I suspect either the fuel pump purchased off Amazon is bunk, or the fuel hose I used is too thick and long/bent to deliver fuel properly. I am planning or replacing it with a vacuum hose. Does anyone have any insight as to whether I am on the right track here?

Thank you.

 

[racerone]

test run with another tank and hose.

 

[F_R]

Do not use automotive "vacuum hose". Most of that stuff will not stand gasoline and will turn to mush..

 

[trashcanslam]

Do not use automotive "vacuum hose". Most of that stuff will not stand gasoline and will turn to mush..

Noted, thank you. Any suggestion on what I should use instead? I'm going to use a different fuel tank and hose as well to test that.

 

[OptsyEagle]

They do have a fuel pump rebuild kits for your motor. A bit of a pain to do, but the kits are available. Certainly test other aspects first. The fuel hose and tank are a good start. Make one change at a time if you want to isolate the ultimate culprit.

When you cleaned the carb did you see a little spring that is used to ensure the inlet valve drops down with the float. Those valves can stick and a sticky inlet valve does tend to stop the fuel from getting to where it needs to be. Just something else to ponder.

 

[Crosbyman]

http://www.leeroysramblings.com/Rebuilding_fuelpump.htm

read read read again BEFORE going ahead scribe the side with a felt pen or nail to reassemble correctly

I put a drop of crazy glue on the base of the springs to hold it upright as I reassemble the layers

I also glue the mushroom domes in place with crazy glue to hold the in place

smalll parts that fly !! work carefully on a clean surface