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Zexel is Bosch's Japan division. Not a knock off. Commonly found on Kubota, etc..... I'm still guessing he has a slight air ingestion, and would also not build delivery pressure due to it. Did he mention if the suction side hoses were replaced? Nearly all are leaking by now if not.

Don't ding him so fast. You don't know why it is not spraying fuel. Very rare for these pumps to fail, I think only a single case on SS?. Like others said, it may be sucking a small amount of air and not pressurizing the barrels. Measure inlet fuel pressure, verify pump drive, then pull...

Not a P7100, just looks like it. Same inline pump assembly, and same gear attachment mechanism (taper). Pump shaft has key slot, but key is not used. He could remove the governor cap and see if the governor weights/springs are spinning around at a good pace when cranking to check if taper is...

Sorry I may have missed. Did you confirm it will fire on ether? One member had the shaft strip out on the connection to the stop lever. His would not shut off, but yours could be failed opposite? Just another thing to check. If OK, then it looks like your pump has something funky going...

Zip tie back the stop solenoid. Dollars to donuts, this is the issue (low batt voltage). Cranking speed stays consistent as voltage drops to where solenoid extends to stop position.