I rescued an 87 GTI 16V. Hadn't started or ran since 1993 and I got it in 2018. First thing I did - called a tow truck and sent it to the VW mechanic! They removed the tank, cleaned it, put it back - flushed all fuel lines, replaced filter, new plugs, etc, gas, battery - fired right up. Never looked back! Did need a new sender and fuel pump also. They wrote on the ticket DO NOT TRY TO START! Oh yeah - also put a new timing belt on it since that's why the original owner parked it. I had the belt.