groovy_moon
Seaman Apprentice
- Joined
- Aug 6, 2018
- Messages
- 31
Engine has ~318 hrs. I have vesselview installed.
1st time out this season about 2 months ago the boat started and ran fine. I was on last years fuel, it was ethanol free and stabilized. I then went and filled up (not at my normal station, but it was a relatively newly built station) with supposedly ethanol free "rec gas".
The next time out it ran fine for about 45 minutes of towing the kids. We stopped for lunch for about an hour. When I went to start the fuel pump sounded like it was pumping gravel (someone said it may have been cavitating) and no way would the engine start. It was not a hot day and I have never had an issue with vapor lock with this boat. I had a friend tow me off the lake and I tow the boat home.
The next day, in the driveway, the boat started right up. I let it run at idle. It idled normally at 650 RPM. Fuel pressure was normal (I have a gauge). I turned it off and removed the gauge. It started back up and idled normally. At about 20 minutes I gave it some throttle to about 2k for a few seconds and then brought it back to idle. After another 5-10 minutes I started noticing that the idle RPM were starting to decrease. At about 40 total minutes it was idling at ~575 RPM and not sounding real healthy. I goosed it again and it stalled. It would not start. The fuel pump sounded a little raspy again. It would not start if I advanced the throttle in neutral (so not IAC).
Myself and a few mechanics were convinced it was the fuel pump. That clearances were opening up when it got hot and it was not pumping fuel. 3 weeks and $1800 later there is a new OEM fuel pump / CF2 rebuild kit installed. They had to pull the engine to do it
I take the boat out last Saturday July 10th. It seams to run ok. I am towing the kids around for about 45 minutes. It runs at 2500-3000 rpm without any dogging.. I do notice that later in the run when I go to idle that its idling at ~600 instead of 650..
We stop for lunch and some swimming. Again it is not a hot day.. mid 70's. I go to leave. The boat starts... it runs for about 60 seconds and then sputters out and will not re-start... So I get towed off the lake AGAIN.....(by the same friend)
I am thinking dirt or crap in the tank in the tank is plugging up the pickup and that eventually the pump suction (remember MPI so hi pressure pump) collapses the fuel line and once collapsed it take a long time for the vacuum to release. If the boat is towed down the road maybe the bumps in the road knock the crap off the screen or out of the tube.
Also.. Since the fuel tank is in the bow... it is V-shaped.... this would tend to concentrate any crap into a nice little pile right about where the pickup tube is.
The boat is in a shop right now... but I may take it back and screw around myself.
Thanks
1st time out this season about 2 months ago the boat started and ran fine. I was on last years fuel, it was ethanol free and stabilized. I then went and filled up (not at my normal station, but it was a relatively newly built station) with supposedly ethanol free "rec gas".
The next time out it ran fine for about 45 minutes of towing the kids. We stopped for lunch for about an hour. When I went to start the fuel pump sounded like it was pumping gravel (someone said it may have been cavitating) and no way would the engine start. It was not a hot day and I have never had an issue with vapor lock with this boat. I had a friend tow me off the lake and I tow the boat home.
The next day, in the driveway, the boat started right up. I let it run at idle. It idled normally at 650 RPM. Fuel pressure was normal (I have a gauge). I turned it off and removed the gauge. It started back up and idled normally. At about 20 minutes I gave it some throttle to about 2k for a few seconds and then brought it back to idle. After another 5-10 minutes I started noticing that the idle RPM were starting to decrease. At about 40 total minutes it was idling at ~575 RPM and not sounding real healthy. I goosed it again and it stalled. It would not start. The fuel pump sounded a little raspy again. It would not start if I advanced the throttle in neutral (so not IAC).
Myself and a few mechanics were convinced it was the fuel pump. That clearances were opening up when it got hot and it was not pumping fuel. 3 weeks and $1800 later there is a new OEM fuel pump / CF2 rebuild kit installed. They had to pull the engine to do it
I take the boat out last Saturday July 10th. It seams to run ok. I am towing the kids around for about 45 minutes. It runs at 2500-3000 rpm without any dogging.. I do notice that later in the run when I go to idle that its idling at ~600 instead of 650..
We stop for lunch and some swimming. Again it is not a hot day.. mid 70's. I go to leave. The boat starts... it runs for about 60 seconds and then sputters out and will not re-start... So I get towed off the lake AGAIN.....(by the same friend)
I am thinking dirt or crap in the tank in the tank is plugging up the pickup and that eventually the pump suction (remember MPI so hi pressure pump) collapses the fuel line and once collapsed it take a long time for the vacuum to release. If the boat is towed down the road maybe the bumps in the road knock the crap off the screen or out of the tube.
Also.. Since the fuel tank is in the bow... it is V-shaped.... this would tend to concentrate any crap into a nice little pile right about where the pickup tube is.
The boat is in a shop right now... but I may take it back and screw around myself.
Thanks