New member here and this is my first post!
Issue: AFTER SHUTOFF, fuel partially fills flame arrestor housing and drips from choke shaft. This occurs even with the fuel shutoff and since the engine is off, the electric fuel pump is not operating
Background:
Gasoline atomic A4 with late mode Zenith Carburetor
Installed in 27' 1976 Tartan
Gas tank is stainless steel situated above the engine, inline shut off directly below the tank
Electric Fuel pump
Racor water separator / filter
We have owned the boat for about ten years but have recently had a child and the boat has seen little use for the past 4 years. Most recently, our engine has not been running well and the cabin has been smelling of gasoline. Fuel pumped from the carburetor supply line in to a container separates into layers suggest water contamination
In the interest of fixing the issues I have:
Replaced the fuel cap seal in the cockpit. During heavy rains our cockpit will have some water in it and I suspect that some has been getting past the cap seal.
Old fuel has been removed from the tank and replaced with fresh. The filter element for the Racor has been just replaced and a new polishing filter has been installed between the fuel pump (sediment bowl emptied and cleaned) and carburetor. I have also jumpered the fuel pump and ran the fresh fuel through the system, filling up a pint (or so) container. Fuel looks good now.
I have cleaned and rebuilt the carburetor using the Moyer Marine kit for the late model carbs. A new float needle and seat has been installed and I have "burnished" the seat on two separate occasions in the hopes of improving any sealing issues. The float sits parallel to the carb body when held upside but I have not measured the pontoon heights. All new gaskets, seals and jets that come with the rebuild kit have been installed.
Upon carb reinstallation (I have had it on and off twice) the engine starts easily needing little choke and runs well at throttle and idle. Upon shutoff, all seems well for 10 minutes or so but eventually gas begins to flow into the air intake bore / flame arrestor housing and drip out of the choke plate shaft penetrations. Shutting off the fuel underneath the tank doesn't stop the issue.
After the recent rebuild I removed the carb and rechecked my work. I also burnished the needle seat a second time and checked again the float was parallel to the carb body. I also bench tested the carb assembly with a lawn mower gas tank held above it supplying gas to the carb. It seemed OK after sitting for five minutes. Upon reinstall the issue is the same!
QUESTIONS:
Do I need to do more "burnishing" of the the seat? I simply twisted the supplied hardwood dowel back and forth a few times on two separate occasions. Everything looks OK.
Is my fuel supply still bad? As far as I can tell, there is clean fuel now being supplied to the carb. Stainless steel tank with fresh gas going through a new Racor fuel element and then through a new polishing filter appears to be giving me nice looking gasoline when I pump it into a container. Is there anything more I should do here?
Do I need to change the float height? If I was to increase the distance between the carb body and the pontoon (by bending the float), it should lower the level of fuel in the carb. Perhaps my fuel level is set too high in spite of float being parallel to the carb body?? Or perhaps my float is leaking? I can feel absolutely no liquid in side the float when I shake it. Could it still have a leak? Should I just buy a new float? Basically the overflowing issues have persisted in spite of the carburetor rebuild. During the rebuild I didn't change the float setting (it seemed correct) or replace the float so perhaps this points to the float being the issue??
Should I give up on this carb and buy a rebuilt one from Moyer?
Should I hang myself? Getting a little frustrated!
Thanks for any and all thoughts!
Eric
Issue: AFTER SHUTOFF, fuel partially fills flame arrestor housing and drips from choke shaft. This occurs even with the fuel shutoff and since the engine is off, the electric fuel pump is not operating
Background:
Gasoline atomic A4 with late mode Zenith Carburetor
Installed in 27' 1976 Tartan
Gas tank is stainless steel situated above the engine, inline shut off directly below the tank
Electric Fuel pump
Racor water separator / filter
We have owned the boat for about ten years but have recently had a child and the boat has seen little use for the past 4 years. Most recently, our engine has not been running well and the cabin has been smelling of gasoline. Fuel pumped from the carburetor supply line in to a container separates into layers suggest water contamination
In the interest of fixing the issues I have:
Replaced the fuel cap seal in the cockpit. During heavy rains our cockpit will have some water in it and I suspect that some has been getting past the cap seal.
Old fuel has been removed from the tank and replaced with fresh. The filter element for the Racor has been just replaced and a new polishing filter has been installed between the fuel pump (sediment bowl emptied and cleaned) and carburetor. I have also jumpered the fuel pump and ran the fresh fuel through the system, filling up a pint (or so) container. Fuel looks good now.
I have cleaned and rebuilt the carburetor using the Moyer Marine kit for the late model carbs. A new float needle and seat has been installed and I have "burnished" the seat on two separate occasions in the hopes of improving any sealing issues. The float sits parallel to the carb body when held upside but I have not measured the pontoon heights. All new gaskets, seals and jets that come with the rebuild kit have been installed.
Upon carb reinstallation (I have had it on and off twice) the engine starts easily needing little choke and runs well at throttle and idle. Upon shutoff, all seems well for 10 minutes or so but eventually gas begins to flow into the air intake bore / flame arrestor housing and drip out of the choke plate shaft penetrations. Shutting off the fuel underneath the tank doesn't stop the issue.
After the recent rebuild I removed the carb and rechecked my work. I also burnished the needle seat a second time and checked again the float was parallel to the carb body. I also bench tested the carb assembly with a lawn mower gas tank held above it supplying gas to the carb. It seemed OK after sitting for five minutes. Upon reinstall the issue is the same!
QUESTIONS:
Do I need to do more "burnishing" of the the seat? I simply twisted the supplied hardwood dowel back and forth a few times on two separate occasions. Everything looks OK.
Is my fuel supply still bad? As far as I can tell, there is clean fuel now being supplied to the carb. Stainless steel tank with fresh gas going through a new Racor fuel element and then through a new polishing filter appears to be giving me nice looking gasoline when I pump it into a container. Is there anything more I should do here?
Do I need to change the float height? If I was to increase the distance between the carb body and the pontoon (by bending the float), it should lower the level of fuel in the carb. Perhaps my fuel level is set too high in spite of float being parallel to the carb body?? Or perhaps my float is leaking? I can feel absolutely no liquid in side the float when I shake it. Could it still have a leak? Should I just buy a new float? Basically the overflowing issues have persisted in spite of the carburetor rebuild. During the rebuild I didn't change the float setting (it seemed correct) or replace the float so perhaps this points to the float being the issue??
Should I give up on this carb and buy a rebuilt one from Moyer?
Should I hang myself? Getting a little frustrated!
Thanks for any and all thoughts!
Eric
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