I have a 16V that is having fuel leakage problems out the fill cap..have replaced the cap with new so it is not a cap issue and seems to come down to over pressure inside the tank forcing fuel out of same. Does anyone know if the 16V tanks have the same arrangements as described above? This car did sit outside for a year while awaiting an engine transplant..and did have old fuel in the tank

I was wondering if spraying or squirting Techron up the vent pipe from the outside of the tank, followed by a blast of compressed air might serve to clean out the accumulated garbage. We have replaced the vent valve, purge valve (at the front under the hood) carbon cannister, most vent lines, fuel pump and screen, and pressure tested and smoke tested the tank outside the vehicle (tank removed)..Have run the car with an open elbow instead of the vent valve..which helped the situation, but was not a complete solution..had cabin fumes all the time...fuel system leaked at several places...which are all fixed now..except for leakage around the fill cap.