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Mod | | | Forums66 Topics128,134 Posts1,056,402 Members48,441 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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| | | | Joined: Mar 2014 Posts: 4,501 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,501 | If it is getting good and steady vacuum all the way to the motor (not difficult to check), then the problem is probably in the vacuum motor itself. You will need 10~11 inches of mercury on your vac gauge usually to make the motor work if the motor is in very good shape and if the motor needs repair/reconditioning you'll need as much as 18 to get it to operate or it may not operate at all. Once upon a time I had a known good motor get stuck somehow in the middle of a sweep cycle and I had fits getting it to work again.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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