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I understand the fuel boiling and evaporating out the vent tubes, but how does any fuel get into the engine to cause a rich condition? It seems something would have to force the fuel thru the jets and out the boosters.
John
Slant sixes are the worst. Fuel line is routed like crap! Even before they started adding alcohol to our fuel my 72 had to be held to the floor to start hot. This was on 50* days too!
Rerouting the fuel line worked excellent! No return line needed. My 74 slant Dart has the same problem.
Fuel injection hose with the fuel injection clamps routed over the valve cover with enough slack to pull the cover to set your valves works. It is in a sticky on www.slantsix.org in the engine section.
I have watched hot steamy gasoline boil and dribble into my hot intake many times.
Rerouting the fuel line was my first attempt at getting rid of this problem. Then I did the heat shield, which I cut out from 18 gauge sheet aluminum from Orchard Supply Hardware, and that worked for all but the hottest days. Finally, I ran the return line.
In addition to eliminating the hot starting issues, the cooler carb and fuel gave me a noticable performance improvement.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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