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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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| | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Brad Allen, that is a windshield washer pump, manufactured by "Trico" I believe, hope that helps. | | | | | Joined: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | I found this information in a GMC book can anyone help fill in the blanks on this, have you ever seen one? The last truck I purchased (1950 6400) had this vacuum pump booster on the firewall. It also had a small rheostat switch with VAC on the dial in the cab. I have found reference to this in my GMC parts book but not Chevrolet (GMC 23.3787 part #2233295) does anybody know how these worked or any more information on them. I assume it is a 6-volt powered vacuum pump that boosts engine vacuum like the optional fuel pump. http://good-times.webshots.com/photo/2379570540102454676YQZtbbhttp://good-times.webshots.com/photo/2145875240102454676VbBPfp | | | | | Joined: Feb 2008 Posts: 14 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2008 Posts: 14 | That is a "Trico" vacuum pump.
It assists the vacuum wiper motor with extra vacuum power. | | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | They were also commonly added to truck tractors pulling trailers with vacuum brakes. However, they were just about as unreliable as the vacuum brakes were. | | |
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