fuel siphoning problem
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Freshman User
Joined: Aug 2010
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carb adjustment -- float valve
Hello Five Star,
I can now report that the old '46 is starting regularly, and I've taken a couple of exploratory runs down the street, After shut off, fuel is dripping out of the throttle shafts at the base of the carb. A local mechanic looked at the base plate when I removed it and thought there wasn't enough play to explain that much fuel. He asked if the float was properly adjusted.
My 1950 Motor's Auto Repair Manual advised on that score, "The float can be set very close when the air horn is off, by measuring the distance between the bottom of the float (not the soldered seam) and the flange surface of the air horn. This distance should be between 1 5/16 and 1 9/32 for the Lincoln Zephyr and between 1 3/8 and 1 11/32 for the Ford and Mercury. This measurement is taken with the air horn removed and held in an inverted position."
Mine originally measured about 1 1/4 and after I carefully bent the tang and got to 1 /3/8" of height, I re-assembled and tried her out.. . .leaked worse than before on shut down.
What diagnosis can you provide about this situation?
Gratefully,
Tom D.
I can now report that the old '46 is starting regularly, and I've taken a couple of exploratory runs down the street, After shut off, fuel is dripping out of the throttle shafts at the base of the carb. A local mechanic looked at the base plate when I removed it and thought there wasn't enough play to explain that much fuel. He asked if the float was properly adjusted.
My 1950 Motor's Auto Repair Manual advised on that score, "The float can be set very close when the air horn is off, by measuring the distance between the bottom of the float (not the soldered seam) and the flange surface of the air horn. This distance should be between 1 5/16 and 1 9/32 for the Lincoln Zephyr and between 1 3/8 and 1 11/32 for the Ford and Mercury. This measurement is taken with the air horn removed and held in an inverted position."
Mine originally measured about 1 1/4 and after I carefully bent the tang and got to 1 /3/8" of height, I re-assembled and tried her out.. . .leaked worse than before on shut down.
What diagnosis can you provide about this situation?
Gratefully,
Tom D.
Elder User
Joined: Oct 2003
Posts: 785
Likes: 0
From: Canada
Tom, are you sure your float is not leaking, or the seat is closing proprely?
The carb is flooding for a reason and you have to locate the issue. Might want to try another Carb just in case that one is worn badly.
Havr you ever had the carb cleaned, or rebuilt? Maybe thats an avenvu you should try by some one who knows what their doing. Its part of the learning process, and by watching some one doing it properly you can do the job your self the next time.
A friend of mine does my carbs, and I just put them on the truck and don't have to adjust anything, they work that well.
The carb is flooding for a reason and you have to locate the issue. Might want to try another Carb just in case that one is worn badly.
Havr you ever had the carb cleaned, or rebuilt? Maybe thats an avenvu you should try by some one who knows what their doing. Its part of the learning process, and by watching some one doing it properly you can do the job your self the next time.
A friend of mine does my carbs, and I just put them on the truck and don't have to adjust anything, they work that well.
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