LMBoat
Well-Known Member
To All,
Could use your help. Here's the specifics: 1995 330 DA w/twin 7.4s, carbs, V-drives, closed cooling, and 1,600 hours. Engines run great, compression good, no issues except:
Sometimes, after running on plane, then a shut down to anchor, when I throttle up to leave, the strb engine will hesitate for a few seconds while trying to get on plane. Once the boat gets on plane, no issues. It does not happen all the time and therefore has been hard to diagnose. I have changed fuel filters, checked fuel lines, treated the fuel, etc, but it still happens. A few weeks ago, I changed out the distributor pick-up <had a similar problem on an engine years ago and this fixed the problem>. I thought this had fixed the problem, but it happened again last weekend.
It is not a tranny/prop problem, nor is it from bouncing the prop in the sand during take off. It does not seem to be dependant on fuel level in the tank. Guages are all good <no overheat, low oil pressure, etc> It seems like a vapor lock problem. Fuel pump is relatively new. coil? ignition amplifer?....The plug wires are relatively new. It is time for a new dist cap and rotor however. The only thing I have not done it to peer down the throat of the carb to confirm a fuel issue vs ignigition, but that's dangerous, and again the problem happens sporadically. Any other ideas on whatelse to check?
Could use your help. Here's the specifics: 1995 330 DA w/twin 7.4s, carbs, V-drives, closed cooling, and 1,600 hours. Engines run great, compression good, no issues except:
Sometimes, after running on plane, then a shut down to anchor, when I throttle up to leave, the strb engine will hesitate for a few seconds while trying to get on plane. Once the boat gets on plane, no issues. It does not happen all the time and therefore has been hard to diagnose. I have changed fuel filters, checked fuel lines, treated the fuel, etc, but it still happens. A few weeks ago, I changed out the distributor pick-up <had a similar problem on an engine years ago and this fixed the problem>. I thought this had fixed the problem, but it happened again last weekend.
It is not a tranny/prop problem, nor is it from bouncing the prop in the sand during take off. It does not seem to be dependant on fuel level in the tank. Guages are all good <no overheat, low oil pressure, etc> It seems like a vapor lock problem. Fuel pump is relatively new. coil? ignition amplifer?....The plug wires are relatively new. It is time for a new dist cap and rotor however. The only thing I have not done it to peer down the throat of the carb to confirm a fuel issue vs ignigition, but that's dangerous, and again the problem happens sporadically. Any other ideas on whatelse to check?