73 911T Warm start problem

My 73 911t has a warm start problem, it has a csi inj. system. after driving 25-30 miles and engine is warm it sometimes is very difficult to restart after a short stop. Whats odd is that is seems to make a difference how much gas is in the tank. The more gas in the tank the better it restarts. Any suggestions on where I might start ??


[This message has been edited by Brian Stevens (edited 03-14-99).]