1988 Bayliner 1950 Capri.
Here's what's on it:
3.0L GMC motor
Rochester 2 Jet carburetor (Model # 2GC, 17086064)
OMC Cobra Stern Drive
I rebuilt the carburetor in 2012. Until recently it has run like a top and been very dependable in the water.
Several weeks ago, we had been out on the water for a while, shut the engine down for a few minutes and then when we went to start it, the engine just chugged and chugged. Finally, it got cleared out, blew some smoke and ran decently around the lake but next time I shut if off, and re-started, same thing. Clearly it seemed to be flooding. Eventually giving up, I took it home.
When I went to work on it in the driveway, I started it up, pulled the air cleaner off it, let the motor come to temperature, shut the motor off, and went to observe down the throat of the carburetor. Low and behold, the engine is off but gas is still pouring into the throat of the carburetor! Best I can describe the location of the incoming gasoline is that it was coming in just above the throttle plates and running across them. It looked like it might be pouring in through what the carb manual called the "Off-Idle Discharge Holes" (but I'm not certain that's where it's coming in). I continue to watch and I would say the gasoline continues to pour across the throttle plates for 6-8 seconds at least, and there's no way to say exactly how much, but it seems like an ounce or more gasoline pours out before it stops!
I pulled the top off the carburetor, checked the filter, visually checked the float and needle, and the "power piston" assembly. The piston on the power piston assembly seemed to be slightly sticky moving up and down so I put some light oil on it. Not yet convinced I'd found the real issue, I put the carb back together, and fired the boat up on the driveway. It ran great! I shut it down, restarted it, shut it down, several times and all seemed well.
I took it to the lake for a couple hours the next day and it ran great. Took it to the lake again yesterday and the first time I shut it down, it flooded again. By checking down the throat of the carb I was able to determine that the same thing was happening as before with gasoline pouring over the throttle plates... So out on the lake, under cover of some shade trees, I took the top off the carb and put it back on three more times before getting something right, and it ran fine the rest of the afternoon!
Needless to say, I really need to figure out what is hanging up or what is causing the flooding so I can fix it for good and have some confidence that it's going to run correctly when we go to the lake! Any ideas?
Here's what's on it:
3.0L GMC motor
Rochester 2 Jet carburetor (Model # 2GC, 17086064)
OMC Cobra Stern Drive
I rebuilt the carburetor in 2012. Until recently it has run like a top and been very dependable in the water.
Several weeks ago, we had been out on the water for a while, shut the engine down for a few minutes and then when we went to start it, the engine just chugged and chugged. Finally, it got cleared out, blew some smoke and ran decently around the lake but next time I shut if off, and re-started, same thing. Clearly it seemed to be flooding. Eventually giving up, I took it home.
When I went to work on it in the driveway, I started it up, pulled the air cleaner off it, let the motor come to temperature, shut the motor off, and went to observe down the throat of the carburetor. Low and behold, the engine is off but gas is still pouring into the throat of the carburetor! Best I can describe the location of the incoming gasoline is that it was coming in just above the throttle plates and running across them. It looked like it might be pouring in through what the carb manual called the "Off-Idle Discharge Holes" (but I'm not certain that's where it's coming in). I continue to watch and I would say the gasoline continues to pour across the throttle plates for 6-8 seconds at least, and there's no way to say exactly how much, but it seems like an ounce or more gasoline pours out before it stops!
I pulled the top off the carburetor, checked the filter, visually checked the float and needle, and the "power piston" assembly. The piston on the power piston assembly seemed to be slightly sticky moving up and down so I put some light oil on it. Not yet convinced I'd found the real issue, I put the carb back together, and fired the boat up on the driveway. It ran great! I shut it down, restarted it, shut it down, several times and all seemed well.
I took it to the lake for a couple hours the next day and it ran great. Took it to the lake again yesterday and the first time I shut it down, it flooded again. By checking down the throat of the carb I was able to determine that the same thing was happening as before with gasoline pouring over the throttle plates... So out on the lake, under cover of some shade trees, I took the top off the carb and put it back on three more times before getting something right, and it ran fine the rest of the afternoon!
Needless to say, I really need to figure out what is hanging up or what is causing the flooding so I can fix it for good and have some confidence that it's going to run correctly when we go to the lake! Any ideas?
