Hello all,

I have a 1968 mustang with a 302. Most of the time, especially when
the engine is  cold, it starts just fine. Sometimes, more often when
the engine is hot than cold, I have to crank the engine for nearly ten
or fifteen seconds before it starts, and then it catches, runs a
little rough for a bit, then funs fine. Once or twice, it has not
started at all after fifteen seconds of cranking. I really hesitate to
even crank it for more than ten seconds, because I don't want to
overheat the starter. The gas cap does not have a seal on it, which is
why I doubt that it is vapor-lock related. The fuel line leading to
the carb has a clear fuel filter, and it is always full or nearly
full. The carb has float bowl gas windows, and they never drain. I was
at one point having trouble with the accelerator jets draining into
the manifold, but i corrected this problem by adjusting the
accelerator arm. For reference, The carb is a Demon 625 cfm road demon
jr. I have an electronic ignition module in the distributor made by
crane cams called the XR-I. My normal starting procedure consists of
pumping the throttle twice and turning the key- that usually works
fine, except for the incidents described above.

Thanks for the help and input!

PS- anyone know any tips for finding vacuum leaks- I'm a bit scared to
use the propane method. Maybe I'm a wuss :-D