Seriously?
have you posted on the APPROPRIATE forums, let alone the right board? this is MK3 not MK4 and this is vortex, a dead site with only a few active members. Go over to the TDI club http://forums.tdiclub.com/forumdisplay.php?f=12 and post in this section. or the 101.
also get a good picture. this is 2020 where any phone has a good decent camera on it. what is this a black light?
but to give you a answer HERE, Your fuel pump is leaking. DO NOT PUT THIS OFF or you WILL TOTAL the engine, diesel will rot the hoses and cause an overheat while driving, happens to many owners.
there is a write up on how to do this. you should do a timing belt while your at it.
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