I just recently installed a schied diesel hot rod pump and now I got a 253 code on my computer what is this and how can I fix it?

 

P0253: Fuel injection pump fuel valve open circuit. Problem sensed with fuel circuit internal to the fuel injection pump.
This is usually a problem with the electrical circuit. I am a little surprised this fault popped up on a recent pump. All newer pumps are supposed to be built with improved circuit boards. Sorry to say, I think you are looking at a new VP44.