Gunk in fuel filter, but tank is clean (1972 Valiant 225)

Bad Sport said
2) Do you have the ground strap from sending unit to the hard line? It's a metal piece with a clip of sorts on each end and it goes from sender to hard line right at the tank (effectively creating a connection over the rubber line).

I cleaned off the strap clips and the hard line to make sure it was making a connection but to no avail. Good thing to check, though!