I've been having a hard start problem. Most times It will turn over... everyonce in a while I will have to bleed the line. I thought it was the check valve on the return line from the VP. However, there is a hissing coming from the gas tank like and when I take off the gas cap there is noticable pressure, and a smoke or haze that is in the tank. I tried searching for threads to remedy this, but could not find any... ... ... Can anyone point me in the right direction? Thanks ~Bill