Claude Lavoie Posted December 2, 2015 Share Posted December 2, 2015 Can someone help me with this. My '31 Buick has what appears a dual chamber fuel pump, sort of two pumps in one. I'm sure those who have seen one know what I mean. Now some previous owner disconnected the lower part of the pump, leaving the "in" and "out" open, therefore using only the top chamber to pump the fuel. Yet the pump works properly. So what is the purpose of the lower part of the pump as I point with my finger on the attached photo? Thank you for your kind help. Claude Lavoie Link to comment Share on other sites More sharing options...
JoelsBuicks Posted December 2, 2015 Share Posted December 2, 2015 I believe that's the vacuum pump portion. My 31-67 doesn't have that part. I suppose my wipers will operate via carb vacuum but I haven't gotten that far yet. Link to comment Share on other sites More sharing options...
DonMicheletti Posted December 2, 2015 Share Posted December 2, 2015 It has been many years, but my '31-67 had no such fuel pump. It was a single stage pump and the car was only 29 years old when I got it. Link to comment Share on other sites More sharing options...
Claude Lavoie Posted December 6, 2015 Author Share Posted December 6, 2015 That makes sense, maybe it was a vacuum pump. Thanks for the replies. Claude Lavoie Link to comment Share on other sites More sharing options...
Mark Shaw Posted December 6, 2015 Share Posted December 6, 2015 (edited) Yes, it is indeed the vacuum side of the pump. Anyone who has actually used vacuum wipers that operate from the intake manifold vacuum knows how they just stall when the throttle is increased. Buick and others used this pump to provide a more constant vacuum supply. The first time my son experienced how the vacuum wipers stalled in our 1952 Chevy pickup, he said we needed to install an aftermarket electric wiper motor. I did not agree, and told him that I thought it would ruin some of the experience of driving an old truck.I still feel that way. Edited December 6, 2015 by Mark Shaw (see edit history) 1 Link to comment Share on other sites More sharing options...
Guest Tommy Mallory Posted December 23, 2015 Share Posted December 23, 2015 Do you have a 1908 Buick? I have one and I could use a little advice. Also, I have a 1952 Chevy Bel-Air Deluxe that I am going to sell. How can I tell if the engine is a 216 or a 235?Thanks. Link to comment Share on other sites More sharing options...
LAS VEGAS DAVE Posted December 23, 2015 Share Posted December 23, 2015 Chevy started making 235 engines in 1954. Link to comment Share on other sites More sharing options...
my31buick Posted December 25, 2015 Share Posted December 25, 2015 I can chime in on the 216-235 engine. I have a 54 chevy 5 window truck. The 54s came with 235 with insert bearings as the earlier had the 216 with Babbitt. U can easily drop the oil pan and pull one rod cap and check. . there may be other was to tell but that's a good start. Link to comment Share on other sites More sharing options...
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