[Scott]

Mark

I dont have a twenty ....but things to check in general if you havent already [img]/images/graemlins/wink.gif[/img]

Does the vent work (vent blocked , vent hose kinked etc)

Fuel delivery line (kinked/ blocked fuel line, primer bulb direction and operation, filters clogged ...Also See if fuel comes out of the tank without the fuel line hooked up to the tank, etc.. )

Fuel pickup in the old tank ( is that clogged inside the tank as a result of above (no fuel out of tank when lines are removed [img]/images/graemlins/confused.gif[/img])

Doesn't sound like anything with the motor if the engine runs on an aux tank.

Start eliminating things one by one .... sooner or later you find something ...if not a combination of issues that will not allow good fuel flow


Edit:
After re reading your post ...how old is the fuel i.e. Has it turned to VARNISH !!!!