2000 Yamaha 9.9 4-stroke

[GSmith]

I leave the motor warm-up, it will run for a while and then stalls. It seems like it is starved for gas. When starting to stall, if you pump the primer ball it will sometimes keep running. The gas line is to the same tank I use for the 150hp with no trouble.

 

[digimortal777]

Re: 2000 Yamaha 9.9 4-stroke

feul pump or may need carb rebiult<br /><br />has it been left sitting?

 

[the machinist]

Re: 2000 Yamaha 9.9 4-stroke

I have a 1992 4 stroke & think your engine should be basically the same. I had similar problems & replaced the primer bulb but finally replaced the fuel pump & everything is a go now. <br /><br />The fuel pump is held on by 2 screw & is located on the upper rear of the valve cover & has a plunger that protrudes inside the cover & is operated of the overhead cam.