Gas in Vacuum Line

farmerdick

farmerdick

Senior Member
Hey Guys, I recently put an aluminum downdraft intake on my 30` roadster, put a Ford model 94 carb on, left the choke closed and hooked up the wiper vacuum line to the bottom of the intake. I took the line off the other day and found gas in the bottom of the loop of the line. Is this normal?

Richard/Maine
 
Nope, no extra gas in a vac line. That would be bad for whatever is on the other end. Maybe it was there from the other carb & the new carb/manifold found it somewhere in the vac line. Is the port you hooked it to have good engine vacumn ?? The port should be below the throttle plates not above the plates. Maybe a drippy carb ?? You said the the choke plate was closed was closed ? Don't understand ?? Remember, that is a vacumn line which means it is sucking from the other end so gas wouldn't pushed into it the carb end,


Joe,,,
 
Sounds like your using an 8BA or later carb and have the vacume line hooked into the vacume port on the back side of the carb.NO GOOD you must use manifold vac NOT venturie vacume. In the second place a 94 carb is too big for an "A" motor unless highly modified. A Strom 81 or a ford -holley 81-92 would be more better. OMO ken ct.
 
I tried to download some pictures but my system is having some problems. The engine, carb, intake and exhaust manifolds are all new or rebuilt and haven`t been started as yet. I have not run any fuel to the carb other than what is seeping by and again, the engine hasn`t been started since the rebuild.I did email the intake manufacturer and he said that the float was set wrong. The vacuum port is on the bottom of the intake and well below the throttle plates.

Richard/Maine
 
You should not have a loop in the line, gas vapors condense just like water vapor and collect a drop at a time in a low spot. The line should be routed down hill toward the carb.
 
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