If it's an inline Simms, there is a separate injector pump for each cylinder and all four pumps ride on a commion camshaft. Pull the access door off and make sure all four pumps are moving up and down. Also check the control rack and make sure it's not stuck.
Sometimes that cam box gets run dry (out of oil) and the injector plungers get stuck.
Re: Simms Fuel Injector Pump on 1960 Fordson Super Major in reply to 182RDC, 10-16-2011 13:51:01
I imagine that's about the same pump on my Ford 655A backhoe. When I bought it, the injector pump crankcase was dry except for a little rust colored fuel. I filled it with oil, changed it when I changed the engine oil. It worked for a couple years. It ran fine, but eventually started dumping its oil rather quickly into the engine crankcase. The local pump shop advised me that the seal had gone, probably because the bearing was shot. I took it to them, and sure enough, the front bearing fell apart upon disassembly.
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