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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2010 Posts: 10,270 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,270 | After you suck on the hose going to the diaphragm, put your tongue over the end of it. The vacuum which you have just created should hold your tongue to the hose until the cows come home. Sounds like you have a minor leak in the diaphragm. Applying the increased vacuum from the big port is indicating that the leak in the diaphragm is minor and is overcome by the huge increase in vacuum.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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