Fernando Mendes Posted February 17, 2012 Report Posted February 17, 2012 Fuel pump?Fuel filter?It is from a DeSoto roadster 1929. Quote
Todd B Posted February 17, 2012 Report Posted February 17, 2012 My guess and strictly a guess is a supply tank for the vacuum wipers. Todd B Quote
Don Coatney Posted February 17, 2012 Report Posted February 17, 2012 If you are talking about the red can I believe it is a vacuum fuel pump. I believe late 20's Plymouths used something like that. Quote
TodFitch Posted February 17, 2012 Report Posted February 17, 2012 My guess and strictly a guess is a supply tank for the vacuum wipers.Todd B Bzzzzzzz. Wrong answer. If you are talking about the red can I believe it is a vacuum fuel pump. I believe late 20's Plymouths used something like that. Correct again. Don Coatney wins another round. Vacuum actuated fuel pumps were the norm until about 1930. Nearly all were made by Stewart-Warner which had enough patents to keep competition from having a chance. Ford didn't want to pay royalties so he used gravity feed on his cars. Chrysler and GM got tired of paying high prices to Stewart-Warner so they helped AC develop a cam driven mechanical pump. However to use that new pump required significant changes to the block and cam which meant that it took a couple of years for all cars to be converted over. Plymouth started using the AC mechanical pump on the 30-U around the same time as it switched from thermo-syphon to pump driven coolant circulation. Not sure the change over engine number is the same for both, but it could be. An interesting side note: Usually the vacuum driven fuel pumps used manifold vacuum which meant that long hills could be a problem. Chrysler used a system, at least on Plymouth and I assume on other makes, where the vacuum was supplied by the suction side of the oil pump. That can lead to unique failure modes, like having the oil pressure drop to zero if there is a problem with the vacuum fuel pump. Quote
Todd B Posted February 17, 2012 Report Posted February 17, 2012 Interesting, I learned something today. The reason I thought it was for the wipers is because when I had the original 218 in my 49 it had vacuum wipers. And like you said when you climbed a hill or under power the wipers would stop. So my dad took a coffee can and made a supply tank and mounted it right there where the red can was sitting on that picture. The can helped with the wipers but the truck still lacked the ability to go fasrer then the cops. That is when I (against my fathers wishes) changed the engine to 327 and the wiper motor to electric. Thanks for the very interesting history lesson. Todd Quote
Fernando Mendes Posted February 18, 2012 Author Report Posted February 18, 2012 Thanks for the reply.I didn't know this type.But it wasn't a pump,because it worked by gravity. Quote
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