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Mod | | | Forums66 Topics128,108 Posts1,056,228 Members48,436 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2013 Posts: 863 Shop Shark | | Shop Shark Joined: Jul 2013 Posts: 863 | Rebuilt a combination vacuum pump/glass bowl fuel pump om my 1949 Chevrolet 3100 series 1/2 ton pickup with a 216 cu. in. 6 cyl. to assist with the vacuum wipers. Cycled the pump 5-6 times as per the Chevrolet truck shop manual before tightening the vacuum side of the pump. The pump I removed from the truck was a single stage pump that the plunger could be cycled with very light thumb pressure. The combination pump after fully assembled would only cycle if I pressed the plunger/lever to the top of my work bench. My question: Is it normal for the combination pump to be much harder to cycle than a single stage fuel pump, or is the single stahe pump I removed just very weak?
"Pay attention to the details! It ALWAYS pays off."
1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle
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