Frank Blackstone Posted January 1, 2023 Report Share Posted January 1, 2023 The original fuel pump was missing a valve assembly where one could have been installed. The pump worked fine for years but diaphragm failure necessitated a rebuild. I installed the 2 new valves from Mopar Pro supplied without instructions. When the installed rebuild pump did not pump I looked closer at the manual's exploded view of dissembled pump. The values appear to be installed in opposing directions. This makes sense as to why a missing valve could allow a pump to function. Any comments or opinions are welcomed. Thanks, Frank. Quote Link to comment Share on other sites More sharing options...
JBNeal Posted January 6, 2023 Report Share Posted January 6, 2023 plunger down: check valve, carb side closes; check valve, tank side opens; diaphragm draws fuel into pump plunger up: check valve, tank side closes; check valve, carb side opens; diaphragm pushes fuel into carb I reckon if'n ya got a fuel line restriction, that could approximate a check valve Quote Link to comment Share on other sites More sharing options...
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