stupidhawk
Cadet
- Joined
- Apr 22, 2008
- Messages
- 16
Boat is a 30' 79 scarab with twin Mercruiser 350s. Boat ran fine last summer and i have taken it out 3 times this summer and same problem all 3 times. Boat idles fine on muffs in driveweay and on hte water. every time i put it in the water it idles on the trailer fine and idles to the dock fine. When idling out it does fine and as i apply throttle it will take throttle for about 20-30 seconds until the starboard engine loses RPMs and then stutters and dies. It will usually restart but every time it restarts it will run for a shorter time 5-10 seconds each time until finally it won't start at all. The port engine also runs poorly and all 3 times i have had to idle back on the port engine and it will only hold around 1500 RPMs running roughly and sputtering most of the time. Any more throttle will kill it and it will die.
The first weekend i thought it was bad fuel and tank was almost empty. I put in 60+ gallons to top it off and same problem. I thought maybe filters were clogged so when we got home put in 2 new filters and went on trip #2. Same problem again. Got home from that one and checked engine timing with timing light and its fine. Points system is gone both distributors have Petronix system and seems to work fine. Put in new filters again just in case and trip #3 had same problem. I bought an extra coil and i replaced the coil on starboard engine with no change at all exactly same syptoms. I changed the coil after we were tied up all day and both engines were cool. After coil change i had big hope as it started fine and held 3500 rpms in neutral for a minute at least i thought i had problem solved. When put boat in gear and got on throttles same problem as nose comes up and after about 25 seconds predictably the starboard engine dies first and has trouble, and the port engine runs like crap. I am thinking something is coming to the rear of the tank near the pickup and blocking flow. Any other ideas or suggestions? Thanks in advance i have been fighting this all summer and getting frustrated
The first weekend i thought it was bad fuel and tank was almost empty. I put in 60+ gallons to top it off and same problem. I thought maybe filters were clogged so when we got home put in 2 new filters and went on trip #2. Same problem again. Got home from that one and checked engine timing with timing light and its fine. Points system is gone both distributors have Petronix system and seems to work fine. Put in new filters again just in case and trip #3 had same problem. I bought an extra coil and i replaced the coil on starboard engine with no change at all exactly same syptoms. I changed the coil after we were tied up all day and both engines were cool. After coil change i had big hope as it started fine and held 3500 rpms in neutral for a minute at least i thought i had problem solved. When put boat in gear and got on throttles same problem as nose comes up and after about 25 seconds predictably the starboard engine dies first and has trouble, and the port engine runs like crap. I am thinking something is coming to the rear of the tank near the pickup and blocking flow. Any other ideas or suggestions? Thanks in advance i have been fighting this all summer and getting frustrated
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