rhopwoodsr
New member
I have a 1994 Silverton 34 express with 454 xl motors that have 650 hours on them. Both motors have excellent compression and all cylinders with +/- 5 pounds. The Silverton has a single gas tank with individual pickups for each motor including the genset. I have had the fuel in the tank drained, filtered and replaced because of varnish. I have replaced the water/fuel filters several times.
My problem started after the starboard engine was moved to replace the dampener plate in May 2015. That may not have had nothing to do with this problem. But it is the time frame I have. On my return home from a 60 mile trip in November the starboard engine started to stumbled and starve for fuel. Every time I advanced the throttle the engine would start to die. I had to pull the throttles back to below 2000 rpm to keep the starboard engine running. After that I:
1. Replaced the oil pressure fuel shut off switch
After I was home, I noticed that fuel siphoned back into the tank from the starboard carb if the boat sat for a few days. I then:
2. Installed anti-siphon valves
Problem of the fuel siphoning was resolved. Then when the tank was half full or less problems with starboard engine started again. Pulled out the pick tube and inspected, no problems. Then I:
3. Replaced fuel line to fuel/water filter
4. Replaced fuel/water filter and mount
5. Replaced fuel pump with crusader pump
6. Replaced carburetor
7. Replaced distributors with Davis HEI
Went on trip and ran for 6 hours, no problems. Then starboard engine started dying, stopped and fueled up the boat. Problem persisted and then the port engine started doing the same thing. Got to my destination and removed the anti-siphon valves, problem cleared.
On my return trip within a ½ hour the problem started with the starboard engine. This time the engine would run in neutral but not in gear. I bypassed the pressure switch but the problem remained. ½ hour later problem cleared and I then ran 6 hours and got home with no other problems.
I have since used the boat on short trips on the ICW where I would run at 3200 rpm for about 45 minutes and then down to 1200 for short periods. Everything ran fine for months. Then I went on a 35 mile trip. Left with a full tank no problems on the way there. On the return I ran 28 miles no problem and then starboard engine started starving for fuel and won’t run over 2000 rpm on 3/8 tank of fuel. Every time I advanced the throttle the engine would stumble and start to die. Had to pull back to 2000 rpm to keep it running.
1. Replaced 10 amp breaker to fuel pump
2. Replaced carburetor
I plan on taking the boat out for a test run this week but I'm almost afraid. If the problem is still there I’ll really be at a loss. Any suggestions?
My problem started after the starboard engine was moved to replace the dampener plate in May 2015. That may not have had nothing to do with this problem. But it is the time frame I have. On my return home from a 60 mile trip in November the starboard engine started to stumbled and starve for fuel. Every time I advanced the throttle the engine would start to die. I had to pull the throttles back to below 2000 rpm to keep the starboard engine running. After that I:
1. Replaced the oil pressure fuel shut off switch
After I was home, I noticed that fuel siphoned back into the tank from the starboard carb if the boat sat for a few days. I then:
2. Installed anti-siphon valves
Problem of the fuel siphoning was resolved. Then when the tank was half full or less problems with starboard engine started again. Pulled out the pick tube and inspected, no problems. Then I:
3. Replaced fuel line to fuel/water filter
4. Replaced fuel/water filter and mount
5. Replaced fuel pump with crusader pump
6. Replaced carburetor
7. Replaced distributors with Davis HEI
Went on trip and ran for 6 hours, no problems. Then starboard engine started dying, stopped and fueled up the boat. Problem persisted and then the port engine started doing the same thing. Got to my destination and removed the anti-siphon valves, problem cleared.
On my return trip within a ½ hour the problem started with the starboard engine. This time the engine would run in neutral but not in gear. I bypassed the pressure switch but the problem remained. ½ hour later problem cleared and I then ran 6 hours and got home with no other problems.
I have since used the boat on short trips on the ICW where I would run at 3200 rpm for about 45 minutes and then down to 1200 for short periods. Everything ran fine for months. Then I went on a 35 mile trip. Left with a full tank no problems on the way there. On the return I ran 28 miles no problem and then starboard engine started starving for fuel and won’t run over 2000 rpm on 3/8 tank of fuel. Every time I advanced the throttle the engine would stumble and start to die. Had to pull back to 2000 rpm to keep it running.
1. Replaced 10 amp breaker to fuel pump
2. Replaced carburetor
I plan on taking the boat out for a test run this week but I'm almost afraid. If the problem is still there I’ll really be at a loss. Any suggestions?
