Hello all,
I have a 'good old boat', with an atomic 4. New carb in 04. It might have 250 hours on it. I had to leave the boat for 3 months - unfortunately the agreed two-weekly engine run didn't happen during that time. 10 days ago, coming back, first thing I did was to replace fuel filter- a screw-on disposable type. Its an old monel tank and the filter usually has a fair bit of white/pale green dust in it- but no obvious water.
Engine exhibited expected roughness (a sticky valve that frees up after a minute or so) , but also what seem to be fuel problems. It would idle, but would starve/die on throttle. It would hunt (correct word?) ie : not stay at steady revs, but oscillate in a range ie 1200-1500.
I left it for a while, tried again, it ran fine for 30 minutes or more. Revved it up and down, ran it in gear etc, no problems.
Today, it started and did a bit of unsteady oscillating then ran increasingly smoothly for about 20 minutes, then it just died. It seems to have plenty of battery and spark, electric fuel pump seem to be working well. I'm guessing that the 3 months sitting dry has let deposits somewhere in the carb. I'm willing to do a carb rebuild if neccessary, but I think all it needs in a clean, if in fact its a carb problem.
1. any suggestions whether the symptoms suggest carb?
2. if carb- is there a quick and dirty approach to cleaning that may be worth a try without removing the carb?
3. if I remove the carb, is it necessary to replace gaskets, or anything else - assuming they're not worn?
4. If its not carb - I can only think its a blockage upstream of the fuel filter...any suggestions ?
thanks to anyone who has any suggestions,
Simon
I have a 'good old boat', with an atomic 4. New carb in 04. It might have 250 hours on it. I had to leave the boat for 3 months - unfortunately the agreed two-weekly engine run didn't happen during that time. 10 days ago, coming back, first thing I did was to replace fuel filter- a screw-on disposable type. Its an old monel tank and the filter usually has a fair bit of white/pale green dust in it- but no obvious water.
Engine exhibited expected roughness (a sticky valve that frees up after a minute or so) , but also what seem to be fuel problems. It would idle, but would starve/die on throttle. It would hunt (correct word?) ie : not stay at steady revs, but oscillate in a range ie 1200-1500.
I left it for a while, tried again, it ran fine for 30 minutes or more. Revved it up and down, ran it in gear etc, no problems.
Today, it started and did a bit of unsteady oscillating then ran increasingly smoothly for about 20 minutes, then it just died. It seems to have plenty of battery and spark, electric fuel pump seem to be working well. I'm guessing that the 3 months sitting dry has let deposits somewhere in the carb. I'm willing to do a carb rebuild if neccessary, but I think all it needs in a clean, if in fact its a carb problem.
1. any suggestions whether the symptoms suggest carb?
2. if carb- is there a quick and dirty approach to cleaning that may be worth a try without removing the carb?
3. if I remove the carb, is it necessary to replace gaskets, or anything else - assuming they're not worn?
4. If its not carb - I can only think its a blockage upstream of the fuel filter...any suggestions ?
thanks to anyone who has any suggestions,
Simon
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