fairlady73

I have a 1976 F350. She has a IMPCO 300A LPG system on a Holley. I am having some problems with the carby settings. Can anyone help with original settings for the IMPCO?

XF-uteman

what is the issue with the carby?
Is it a duel fuel unit of straight gas?

If it is your impco system giving you grief depending upon its age and mounting it could be a number of things like;

-Bi product blockage of the inlet diaphragm (this is a thick sticky oily compound)
-Cracks on the diaphragm (allowing air to pass)
-Vacuum leak (a gasket may be broken)

or if it is carby side (if duel fuel) it may be a collapsed fuel float (this will case flooding)

There is a few more things it may be but more information would be needed including a picture of its mounting.