Titanium48
Petty Officer 1st Class
- Joined
- Apr 24, 2008
- Messages
- 303
I have 16.5 ft bowrider with a 120 hp Johnson outboard (CJ120TLC0). It starts and idles well and runs fine under about 2500 rpm. Holeshot is good when I hit the throttle, but after a short time (10 - 30 seconds) the engine will lose power, surge a few times and then stall. Restarting it after it stall is like a cold start (need to push the key for "choke"). If I pull it back to idle before it stalls it will usually stay running. The primer bulb is a bit soft after it stalls, but it is not flat and is still full of fuel. This was a VRO engine but the previous owner had disconnected the wire running to the oil tank and run 50:1 premix. Initially, the problem was intermittent - the motor would stall on the first few attempts at getting on plane, but would then run at any speed for an extended period. It got worse the last time I had it out and I had to keep it at 2000 rpm to get back to the launch.
I suspect the fuel pump isn't delivering enough fuel to keep the engine running at high speeds. Any other suggestions? Good ways of confirming this? I couldn't find a fuel pump rebuild kit for my engine in the iboats store - do they exist?
Thanks.
I suspect the fuel pump isn't delivering enough fuel to keep the engine running at high speeds. Any other suggestions? Good ways of confirming this? I couldn't find a fuel pump rebuild kit for my engine in the iboats store - do they exist?
Thanks.