Joe,
From what you've told us already, that it runs for a short time, I think a
blockage in lines forward of the pump is less likely.
The pickup pipe in the tank sits just above the bottom of the swirl pot, which is the
(invisible) bowl that sits , fixed, below the sender unit area. Neither the pickup pipe or the
swirl pot are removable. As said previously, the fuel flows into the swirl pot through the
mesh surrounding it, it's then available to be sucked up. If not enough fuel flows into the swirl pot,
the engine will die when the pot is empty. Hence my thinking that this may be your issue.
This thinking was highlighted more when you said you'd 'sealed' the inside of the tank. The
sealant would have quite likely affected the mesh, depending perhaps on how and what was used
as a sealant.
I hope the above more clearly explains my thinking.
Nigel
