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I think that's an "O" ring. There are a few "O" rings and gaskets that can be replaced without tearing the pump apart, but not sure which ones offhand because I usually reseal the entire pump. That diagram looks scarier than it actually is. If you can put a carburetor kit in, you can reseal an...

The pump will have to be removed to reseal it. I buy the kits at a local diesel repair shop. Here's a writeup on resealing a VW pump to give you an idea of what's involved. VWDieselParts.com :: View topic - VE injector pump assembly pictures. . The attached picture is the kit for the 6.2.

I would reseal the pump, then if it has a problem, replace it. You're only out 20 dollars plus your labor if it doesn't work out. I've resealed lots of pumps with success. Why throw money at a problem that may not exist?

If the engine is running fine the pump just needs to be resealed. Cost you about 20 bucks for the kit. If you need a pump, you can get a good used one for less than a $100. A rebuilt one can be had for around $300-$400.