FSD Numbers

[Fry]

I have purchased 3 injector pumps on ebay to use for spare parts. I bought the pumps for next to nothing and I have used one FSD already. My question is the two other FDS's have different part numbers on them than what my factory pump has on it. Should these FSD's be used on my pump or are they totally incompatible.

[JohnC]

The FSD has been through a number of iterations. Each version had a different part number. Otherwise, they should be compatible. Earlier versions are less likely to be in working condition, though.