Fuel Injection Pump Questions

Hello,

I have a 1Z TDI engine with a faulty fuel injection pump that's causing it to misfire.
Now, I'd like to know if there's anything specific I should pay attention to when buying a replacement pump.

Do all fuel pumps from a 1Z TDI engine (Passat, Golf, Audi) fit interchangeably?

Which part numbers can I use?
I have a VAG 028 130 115 MX.
Bosch 046404971

Is it important if I want to buy a relatively new used car?

Can I use a 028 130 115 M as a replacement?
What about the models 028 130 110 and 109?

Sure, no problem. Here's the translation:

'Thank you in advance.'

Hello.

Golfdriver wrote:

.... I have a VAG 028 130 115 MX. Please provide the text you would like me to translate from German to English. Can I use a 028 130 115 M as a replacement?

Yes, that's perfectly possible.
The "MX" is the replacement pump for the "M".
The "X" indicates that this is a reconditioned pump (Exchange).

Why does your car already have a replacement pump installed?

Thank you very much for your quick response .
The previous owner once had quality issues with the diesel fuel at their usual gas station.
As a result, everyone who could prove they had refueled at that time received a new or refurbished fuel injector, etc.
Okay, then I'll see where I can get it installed once I receive the pump.
Do you recommend VAG or independent workshops?
I think I'll get some quotes.