Put boat in water, started quick, idled fine. Left dock, accelerated and ran good for 15 min before quitting, would not restart. Afer several attempts it would idle but die when gas was applied. Now at dock, starts quick, idles rough and dies when given gas. So far I only hooked up an auxillary tank and that changed nothing. What is my next step?
Start quick, idles rough, then dies
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Easy things first.
Could be a combination of things.
If you had winterized your combustion chamber with oil the plugs may be fouled. Remove and clean as necessary. Once the plugs are out for cleaning do a quick compression check also....just to rule out sticking valves. Check for loose wires, if points and condenser have a look at those. Check for loose wires on coil etc. Just takes a few minutes to have a quick look.
You have attempted to address a fuel issue and the issue may be in the carb itself. You could try removing the main jet and ensuring it's clear. If that doesn't do anything for it you might have to remove the carb and clean it up. MMI has a video on how to do that if you are unsure....however, as long as you are careful in taking it apart it's not hard to do at all. You have rigged up an auxil tank so that pretty much rules out water in the gas and bad gas.
So have a good look at everything, take your time. Try to run the engine after each intervention....ie) clean plugs...see if it runs. If you just go and do multiple repairs you may never know what the true problem was.Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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There's a threaded plug on the bottom of the carb. You might try removing it to see if fuel pours out (have a catchment under the carb for this). No fuel suggests a fuel delivery problem somewhere, perhaps the pump.
Mechanical or electric fuel pump?Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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Personally I'd go to carb next. If you have a small air compressor those do a really nice job cleaning the jets once removed. I wouldn`t tackle the fuel pump just yet...might very well be a carb blockage. Pump can be looked at if a carb cleaning doesn`t do the trick.
Check and clean plugs as well. Considerable carbon deposit can be on them if they burned off oil from winter storage. A bunch of small problems can present as a major.Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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Neil, you type fast....I`m still typing and you are posting. Same general area of things. Just so you know I`m not trying to contradict your reasoning.Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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Originally posted by ndutton View PostThere's a threaded plug on the bottom of the carb. You might try removing it to see if fuel pours out (have a catchment under the carb for this). No fuel suggests a fuel delivery problem somewhere, perhaps the pump.
Mechanical or electric fuel pump?
My .02
JeffWith Powerboats, it's about the destination. With Sailboats, you are already there.
Jeff
S/V Karinya
1973 Grampian 30', Full Keel, A4 aux.
sigpic
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If the engine can't "inhale" or "exhale" it won't run well. Check/remove flame arrestor, see if it runs better. If that doesn't work, check/remove exhaust from exhaust flange."Jim"
S/V "Ahoi"
1967 Islander 29
Harbor Island, San Diego
2/7/67 A4 Engine Block date
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Ok, at the boat today, sprayed some carb cleaner in and boat ran great. Ran it for 20 min, put it in gear, forward and reverse, accelerated, no problems. Then all of a sudden it starts to run rough and when given gas she stalls. Several attempts yielded same results. So I am going to clean carb, replace gas filter and lines, then pump tank and replace fuel. Does this sound like a good plan?
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