The fuel filter is built into the pump assembly. They are basically non serviceable. I recommend the Delphi brand. A lot of those cheaper pumps will last about one year.
Yesterday I changed the fuel pump. After changing the fuel pump, I put the pump relay back in, turned the key to ON and listened for the pump to prime. After about 3 seconds, I turned the ignition on and the car started right up! I shut it off, cleaned up my mess, and about 20 minutes later I hopped in and started the car again. No issues. I drove it around the neighborhood and the thing runs great! That cutting out/lag/surging was gone, the engine felt powerful again, and the fuel gauge was back to working.
The hard start issue appears to have fixed itself though. Starts just as well as it did with the dual pump setup now.
I was able to pull off this conversion on Sunday. Car runs well. Super easy install.
I sold an Airtex fuel pump for a Mk2 GTI that had the factory part number filed off (like the part in the OP), and it had been painted, and you could see where Bosch was printed on it under the paint.
I went through 4 Airtex pumps in about 1.5 years in my car. I seriously thought there was a problem with my tank or fuel but it was clean as a whistle in there. Finally upgraded to a Walbro and haven't had an issue since.
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