Don Coatney Posted March 6, 2014 Report Share Posted March 6, 2014 I believe a double action pump is made for vehicles that have a vacuum windshield wiper. It not only pumps gas but it is a vacuum pump to prevent or retard the wiper delay when accelerating. Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted March 6, 2014 Report Share Posted March 6, 2014 I have had my 39 Desoto for 27 years and all throught its life with me I have had a 588 mechanical fule pump on the car. Also basically all its life of of 74 years it has had a mechanical FP. I installed the old style rotary pump prior to the newer gas blend. This style deteriated the diaphram while using the ethinol gas. I installed the Airtex 8011 6v pump and this has been in the car for at least 5 years now. I use this as a primer pump. Now with the newer Airtex 73201 I feel that the new diaphram will our FP should not have any problems with the newer gas blend. I was informed they are going to make a new style diaphram according to the Airtex FP technical rep that i spoke to. So I am staying with the mechanical and the electric as a backup pump. Rich HArtung Desoto1939@aol.com Quote Link to comment Share on other sites More sharing options...
Lumpy Posted March 6, 2014 Report Share Posted March 6, 2014 I would kind of like to run the mechanical pump...it's nice and quiet. But I sure like the instant starts, especially the cold starts, of the electric pump. I might put my gas tank on the roof of the car, and just go with gravity feed like my motorcycles. ken. Quote Link to comment Share on other sites More sharing options...
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