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1948F-1Pickup · 07-16-2017, 10:16 AM

You would apply vacuum and see movement.
No movement is bad. With steady vacuum source,
it should not leak down.
Dead spot taking off that is always there (even on
a warm engine) is probably the accelerator pump
circuit. The 94 on my flathead had a ton of dirt and
crap in all the channels of the booster, where gas
is supposed to come out. Once cleaned out and I
was getting a "shot" of gas out of the booster,
I had no dead spot.

07-16-2017, 10:16 AM	#2
1948F-1Pickup Senior Member Join Date: Oct 2015 Location: Socal Posts: 795	Re: 1948 F2 vacuum advance question You would apply vacuum and see movement. No movement is bad. With steady vacuum source, it should not leak down. Dead spot taking off that is always there (even on a warm engine) is probably the accelerator pump circuit. The 94 on my flathead had a ton of dirt and crap in all the channels of the booster, where gas is supposed to come out. Once cleaned out and I was getting a "shot" of gas out of the booster, I had no dead spot.