Seems 1/2 the pictures one sees of a VW engine there is a 59 cent clear plastic fuel filter hanging near distributor --- just waiting to crack/melt/leak and destroy the car. We all collectively cringe. I have a clear glass one up under fuel tank -- almost as bad but it's nice to be able to see if there's rust collecting in it. The steel ones are preferred for safety. (Do carry a good size fire extinguisher with you!)
NO, NO ----
Another issue could be the fuel pump - you didn't say if still mechanical or an electric add-on. With electric one should turn on key and wait until pump stops running. Mechanical takes engine turning over. Many use the $16 Empi/Facet vibrating electric pumps which aren't very good (and frequently fail). A good rotary pump is worth the $75 (but check volume - you may need a fuel pressure regulator to reduce pressure and keep it consistent).
