Well I guess spoke too soon..I had'nt been out to the shop yet this a.m when I wrote the last reply....Now I have...Last Nite I shut down all heat and ingnition sources in building and left both the schrader type plastic valves propped open with drain pans to catch last drips of sour gas so I could reassemble and fill with gas and start car this a.m....well overnite the right side pan has filled all the way up approx. 2 gals. and running over and is still dripping, left side has a little bit of gas in that catch pan 1/2 quart...so I can only assume that somehow these schrader valves at sending units are some how plugged or a check valve some place is not letting air in the tank to displace the fuel, The gas cap has been off as well as both feed and return lines at the engine and the line going into the left sending unit....care to hazard any guesses?....thanks again...cliff