Manual prime not working

Lmbaunack

Member
'66 Ford 3000 diesel with Simms pump.
Manual prime lever doesnt actually pump
anything. Pump appears to have been
rebuilt not so long ago.

Any common issues that cause this?
 
Try bumping the engine over, then try priming again. If the pump lever is at the top of its cam lobe, it doesn't leave any travel for manual priming.
 


They aren't that complicated inside. They will accumulate fuel/ dust mix that will keep the valves from seating. Could just need cleaning.
 

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