Fuel injection pump rattles

I'm still having the problem where the fuel injector on my ESP is sticking. Seat Ibiza AFN with now 323,000 kilometers (approx. 200,000 miles) on the odometer.

'I recently bought a fuel pump from an auction house for a good price. It's from a Galaxy with an AFN engine and has the end number 115 B on the back! I modified the 10-pin connector and installed it today! Apparently, the pump had been sitting there for 2 years or more, but he couldn't say for sure! Well, that's eBay for you! The pump looks good visually and, as I said, was cheap! After I installed the pump, it rattles like crazy! The vehicle runs, but you can clearly hear a rattling noise from the pump! Even when turning the crankshaft with a wrench without the engine running, you can hear a loud clacking sound when you pass the resistance point?' Has anyone ever experienced something like this before, or does anyone know what might be causing it?

I removed the pump again and, while I was at it, I checked the fuel injector on the old one! It's sticking a bit and has some scratches on it! I need to get out of here soon!

'Today, I completely disassembled the eBay pump because I suspected a broken spring or something. However, everything looked visually fine inside; there were no scratches or defects on any of the parts. Only a thin brown coating and deposits were found on the magnet (inlet port, flow control). I thoroughly cleaned the pump and also cleaned the MSW (motor stator winding). The RSW (rotor stator winding) value was 0.8 V, and I adjusted it to 0.760 V, as that's what it is on my original pump. Now, when I turn the pump with a wrench, everything seems fine. At least, I think it no longer makes a clicking sound, but only the normal resistance. The pump's shaft bearing is fine; it's disassembled, runs smoothly, and there's no rough running.' 'Anyone have any ideas before I try installing the pump again?'

I found the problem myself! The shaft has some play, which is causing it to rattle! This is caused by the impeller disc and the 'shaft drive'. At the point where the two parts mesh together, there is some clearance (wear), which means the pump has a slight amount of play.