600 Ford fuel problems

BadBoy · Aug 12, 2020

I have a 600 Ford - it runs fine cold - after a few minutes - air comes back through the tank - a friend thinks it is a cracked head - how can air come back into the tank from the engine - tank and fuel line and carb is new

da.bees · Aug 12, 2020

Cars from the 40s and 50s had similar problems. They called it vapor
lock (gas reaching boiling point). Boiling point of gasoline varies from 100f
to 400f,depending on what additives it contains from refinery. Pure ethanol
boils at 174f so that plays a roll. What I'd suggest is (A) make sure line
near exhaust isn't copper nor aluminum. (B)check to see if factory heat shield
between engine and tank has been removed. If those are ok,try running a couple
gallons of marine gas or adding diesel to gas,start with 1/2 pint x gallon and
don't exceed 1 quart or don't use enough to make smoke. If that cure's the
problem,stick a piece of Hardie Plank between fuel line and manifold and
insolate line. For what it's worth,some people back in the day claimed wood
clothes pins clipped to fuel line helped (I never tried it).

BadBoy · Aug 13, 2020

Also - there is a heat problem with the engine - I think maybe it is about 1 or 1 1/2 degree out of time or maybe the timing advance system in the distributor may not be working - going to check that - thanks for the advice of checking heat deflectors - I will definitely look into that one - - Thanks

Jim L WA · Aug 13, 2020

Shouldn't it have a vented gas cap?

600 Ford fuel problems

BadBoy

New User

da.bees

Well-known Member

BadBoy

New User

Jim L WA

Well-known Member

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