lowcountryislandhopper
Cadet
- Joined
- Mar 11, 2012
- Messages
- 10
This is quoted text from another thread I have going on another subject..thought this title might get me some help on this one....
I have already replaced ALL fuel lines from tank to pump, new seperator, inline filter, etc.
So...no clue on year model...I said screw it and took the carbs off anyway. This motors entire top end must be brand new. The carbs...all gaskets were NEW, bowls and orifices SPOTLESS, they really look new. The intake behind the carbs...I mean friggin SPOTLESS...all the metal inside the port gleaming like new. Tookem apart, cleaned all orifices (I use a heavy bread tie with the plastic stripped of....works great), blew through, all clean, reinstalled. Zip tied every loose fuel line, even the tiny choke lines. Boat still surges @ WOT unless you pump the primer and runs rough @ low RPM unless you hit the key. And it runs like a TOP if you pump the bulb every 2 minutes or so @ WOT ...you don't have to pump constantly. Both seemingly indicate starving. I'm baffled. Can the pressure out of the fuel pump be tested? I took it apart and the diaphram looks brand new...like everything else. It is the VRO combo pump (VRO disconnected) and I'm wondering if it's possible the oil pump is damaged and is causing the fuel pump to fail, or suck air. I'm not sure on the sync procedures with the carbs...but I made sure they all line up in various throttle positions, and the roller and cam for the throttle linkage is as it should be. There were 2 differences in how the motor performed-----before when it would surge @ WOT it would eventually loose power and come off of plane...yesterday it was staying on plane and the surges were in shorter bursts, and also when it would do this before, I would have to rev the engine in neutral a few seconds to be able to get the motor to come up to speed again....yesterday all it took was pulling the throttle back to an almost idle for about 30 seconds, then hammering down on it again...popped right back up. SOOOOOO.....better I think....but NOT FIXED....
Anybody????
I have already replaced ALL fuel lines from tank to pump, new seperator, inline filter, etc.
So...no clue on year model...I said screw it and took the carbs off anyway. This motors entire top end must be brand new. The carbs...all gaskets were NEW, bowls and orifices SPOTLESS, they really look new. The intake behind the carbs...I mean friggin SPOTLESS...all the metal inside the port gleaming like new. Tookem apart, cleaned all orifices (I use a heavy bread tie with the plastic stripped of....works great), blew through, all clean, reinstalled. Zip tied every loose fuel line, even the tiny choke lines. Boat still surges @ WOT unless you pump the primer and runs rough @ low RPM unless you hit the key. And it runs like a TOP if you pump the bulb every 2 minutes or so @ WOT ...you don't have to pump constantly. Both seemingly indicate starving. I'm baffled. Can the pressure out of the fuel pump be tested? I took it apart and the diaphram looks brand new...like everything else. It is the VRO combo pump (VRO disconnected) and I'm wondering if it's possible the oil pump is damaged and is causing the fuel pump to fail, or suck air. I'm not sure on the sync procedures with the carbs...but I made sure they all line up in various throttle positions, and the roller and cam for the throttle linkage is as it should be. There were 2 differences in how the motor performed-----before when it would surge @ WOT it would eventually loose power and come off of plane...yesterday it was staying on plane and the surges were in shorter bursts, and also when it would do this before, I would have to rev the engine in neutral a few seconds to be able to get the motor to come up to speed again....yesterday all it took was pulling the throttle back to an almost idle for about 30 seconds, then hammering down on it again...popped right back up. SOOOOOO.....better I think....but NOT FIXED....
Anybody????