Re: Carter Carb fuel leak

Posted by jwblazek On 2020/5/30 10:56:45

Thanks Chris.

Regarding your fuel pressure, it would not surprise me at all if the 5 - 8# you have would cause problems with the valve seat in the bowl. Did you measure the pressure?

Is your mechanical pump not working, I do not see a reason to have two pumps.

As far as the carb leak, I am reasonably certain I can get mine to leak again by draining the bowl and then turn the electric pump on and don't start the car. Within a few seconds, fuel will pour out. However if I start the car, that fuel leak does not occur, even if I shut it off and then turn just the fuel pump on. Something is strange there, would like to find the fix, but as long as I don't empty the bowl, the problem doesn't occur. Only thing I can possibly imagine that if the float drops all the way down, it binds on something.
Fuel pressure on this electric pump is about 4.5#. Mechanical pump is on my bench, a rebuild project for the future.

As far as your carb being "dynoed" I think what they use a dry flow unit not a dyno, as dynos are used to measure engine performance HP and torque. On a dry flow bench, only air is used, no fuel, so if the float is sticking, it would not be discovered. Would like to know more about his testing, carb shop name?
Is the leather seat on the anti-percolation valve intact and is it closing?

John