Only one filter is necessary if you are running a pump in the tank. The fuel pump sock acts as the "pre-filter" that would typically be installed if you were running a frame pump kit.
Take the return line off the throttle body and blow through it. You should be able to push a good amount of air through it, fairly easily. If it's hard or impossible to get air through it you may have a kink or debris in the line, or the tank is not vented or not vented well enough.
Before you can really do anything you've got to determine why you're running 70lbs of fuel pressure. Either the return line is backing up and causing pressure creep or it's also possible the fuel pressure regulator is bad.
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-Jason
1969 Pontiac Firebird
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