180 rusty fuel

I have a friend who got a super cheap 180 that had been forgotten about in the corner of a shed for 25+ years. Against everyones' advice he dumped fuel in and tried to drive it home.
Now its my problem, and every fuel line i have seen so far is full of rusty chunks and slimey crud including the return lines off the injectors.
How likely is it that the injectors and injector pump are now screwed?
 
It started and ran???? Or NOT ?? or NOT and I'd say you have big problems like maybe the rotor plungers stuck in the rotor and stuck injector pintles and on and on. It may have even seized the rotor to the hydraulic head and twisted off the driveshaft when he cranked it over.
 
One piece at a time , clean, measure, compare to blueprints, repair or replace ,test ,continue till operation, over look one item thats just guessing it will perform to operate.correct ,cant afford that ,a redo .
 
sorry i should have been more specific
it started and ran fine. he drove it for around an hour wide open. It ran rough for about 5 minutes before it died. He says if you dig crud out of the return line it will run to idle around the yard for 15 or 20 minutes then sputter and die.
 
(quoted from post at 18:27:08 05/18/22) sorry i should have been more specific
it started and ran fine. he drove it for around an hour wide open. It ran rough for about 5 minutes before it died. He says if you dig crud out of the return line it will run to idle around the yard for 15 or 20 minutes then sputter and die.
Remove the outlet fitting on the top of the inj pump lid. Shove a small punch down thru it from the top and get rid of the glass ball and spring inside. Run it like that for awhile and see if that cleans things out. You'll probably have a plugged sediment bowl inlet next.
 
The crud is the failing weight retainer ring thats plugging the return system, injection pump needs removed for repair. Dont knock out the return check ball and keep driving it, or you WILL seize the pump hydraulic head and break the drive shaft when the retainer pins shear off and lock the rotor.
 

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