Tom_M wrote:
My Ford chassis has two fuel lines connected to the fuel pump. One is supply and the other is return. My generator fuel line taps into the return line. I suspect what you are calling a vent line is actually the return line. Check along the return line and see if there is a tee somewhere.
Fuel line plumbing has changed in the past 10+ years ! Many do NOT have a return line any more, just a vent line.
You do NOT want to tap the supply line out of the tank ! The pressure is too high for the float and needle valve in a carburetor to prevent an overflow.