by dave-r » 25 Apr 2011 20:05
3/8ths hard fuel line will be more than big enough. But loose the rubber hose for sure.
As long as the tank has some sort of breather to let air in as the fuel is sucked out it will be fine. It only needs a small vent. More than one is pointless. But make sure it actually works.
If the fuel pump is OK it might be worth checking the rod that operates the pump. Remove the plug from the block next to where the pump mounts and the rod will come out. If it has worn a bit short the pump will not be delivering all it should. I can't remember off-hand what the correct length is though.
The Dave giveth and the Dave taketh away.