Oil in Vacume line!

[montanagrizzly]

Quick ? My buddy has a 94 440 that his son rides. He put a new fuel pump on it! When he fueled it up the first time he had about half cup of two stroke left and just dumped it in the tank. Now when riding the engine will just stop. With further inspection the line that comes from the case to the fuel pump is filled with two stroke oil. We pull the line and clean it and it starts immediatly! runs for another hour and again. on the second tank of gas it only did it twice! Anyone have any ideas of what is going on! thanks!

 

[BB454]

oil

Double check that the hoses are on the correct fittings, compare to the original pump. The housing has arrrows showing flow. I assume there is only one fitting on the vacume side of the diapham. If this isn't a new issue, you may have a leaking check valve in the oil injection. The fitting that the small hoses plug onto actually have a check valve in them and one of them may have failed. Look on the front of the case below the Y pipe near the bottom of the motor. There is a small plug screwed in there that can be removed to drain the bottom of the case. Try that and see if it fills again. Then look at the check valve. You could pull the line off the valve and push some premix through it with a syringe and see if it will clean up. Then drain the premix out the front plug. It should take a little force to push through that check valve, if not it's probably stuck open.

 

[montanagrizzly]

Ill try that thanks for the help!