HELP !! 9400 combine just quit

Just started on the corn and got a hopper full. Got out and did a walk around. Got back in, gave her full throttle and started to back up when it died. It was just like the key was turned off. Replaced fuel and water separator filters. Cleaned the vent tube of fuel tank. I got 12 volts to the fuel shut off solenoid when the key is on. Pulled the solenoid out of the pump and it seems to be working. The only thing I have not tried yet is making sure the injection pump is turning. Is it the injection pump? Any thought or ideas would be appreciated,
 
Our 9600 did something similar to that this year, it'd start and run fine in the yard, take off out to the field and maybe it'd quit on the road maybe it wouldn't. We thought it was the filters so we replaced them all, then it ran all day so we thought we had it, next day it died in the field multiple times so we thought it was the fuel pump at the bottom of the tank, replaced it and that did nothing. Called the dealer and talked the to mechanic, he figured it was in the wiring harness but not sure, harness cost $2500 so instead of throwing parts at it had the dealer send a guy out and after two hours and pure luck he found it to be a bad relay.
 

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