Frank Blackstone Posted January 1, 2023 Report 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
JBNeal Posted January 6, 2023 Report 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
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