Differences between TRW and Federal pumps


Federal pump has a tapped hole in the end of the pump shaft.

TRW/Thompson pump has a hex-shaped hole or no hole in the end of the pump shaft.

Federal pump uses a reservoir cap with "ears" much like a radiator cap.

TRW/Thompson pump uses a reservoir cap that is round and may have vertical serrations but no "ears".

NOTE: Federal pump reservoir cap will fit on a TRW/Thompson pump.