Yamar 1500 D

/ Yamar 1500 D #11  
I’m in need of some advice. Helping a friend with his tractor. It has been sitting 8 years. I replaced the injection pump on the tractor. I got it running but now it wants to run wide open. My first thought is that it is the governor; however, I watched a you tube of some installing injection fuel pump and aligned the governor. I completed everything this person did and I can’t figure out what else would cause this to run wide open like that. I read a few forums but I couldn’t see where someone else explained what the fix was for the running wide open.
Stuck plunger, fuel rack binding. When you installed the new injection pump, did you clean fuel tank and install new filter and fresh fuel? Is B1500 tractor or engine model. Pics of tractor, engine, an pump for everyone would help.(y)
 

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