I want to resurrect this thread. I have a vf700s, I just replaced the fuel petcock from another bike, everything looks still in decent shape and it doesn't leak, however, the vacuum line I have disconnected and sealed off. This was how the other leaky petcock was setup too. Now, when I drive, I get about 45 - 70 miles and I start to die out and have to switch to the reserve setting. I go to fill up again, and i'm only putting in about 1.5 gallon (out of 5 gallon tank). Does this sound like this petcock acts like a low pressure pump? or least drawing out fuel from the tank when the tank level hits a certain level???
thanks!