are you filling it until the pump shuts off or just until the gauge says full? sounds like the sender is bad & not reading right.
if you fill until the tank is actually full & it dies after 60 miles or other low mile number there may be a problem with the pick up like you mentioned or something else. but if you fill just to the gauge reads full its the sender or gauge.
a 70 (non ca) should have a vented cap, it allows air in but will stop air/fuel going out. its a small hole but if working it will vent the tank. they sell new vented caps at auto parts stores.
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