Hey deadeye, always do a leak test with your fuel tank system. Get a pair of hemostats or equivalent, a 50cc syringe. Clamp one line with the hemo, pump in air with the syringe through the other line and clamp it. Wait 10 mins, release one of the hemo. If you hear air rushing out, the tank is OK. If you don't, there is a leak somewhere for you to fix. Also don't overtighten the screw of the fuel tank stopper or the tank might split at the stopper mouth.