My 404 Coupé Injection in Auto Talk Posted yesterday at 01:01 AM · Report post Today I reassembled the hydraulic part od the AEG/KF PLF5A fuel lift pump. Bad surprise: despite the excellent condition of the electrical part of the original pump that equipped my car, the same could not be said of the hydraulic part. The idler pinion inside the pump chamber was seized to its shaft! The last time I ran the engine was about 2005 so the seizure occurred after that....I presume after I disassembled the car in 2016. Also, the lower plate that covers the pump chamber has a regulation valve that is supposed to be removed and checked during a rebuild like this and it too was seized! Anyway, all was not lost... ...because I have a spare lift pump from a car I used to own in 1981-1985 and its hydraulic portion was perfect. All it needed was a thorough cleaning. Cleaning nearly done and the last bits about to go back together.... And it's together. I did another dry run test with it all assembled and it sounded good. I should try a pump test, I suppose, though I have no reason to think it won't pump.