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While it's certainly possible, a clogged sock will normally result in either the car not getting any fuel or very little. When it does get very little, it will typically run and idle fine, until you drive it when it will begin to starve for fuel. Some will pass enough fuel at idle and low speed that they will run fine until you get them to highway speed. Then they will slowly begin spitting and sputtering until they use up all of the fuel in the bowls and quit.
If the car runs at sustained highway speeds, it's not likely the sock is terribly restricted.
If you're pulling the sending unit it is well worth changing the sock, especially on an older car. Any time the car has spent sitting for extended periods of time will tend to "shellac" the sock and restrict fuel flow.
I would simply cut the old one off of the pick-up tube (cut the plastic sock clear then use dykes to clip the retainer off) and simply slide the new one on. Once you slide it over the end it will slide on easily, but will not back off without a fight.
Here is my '76 sender. Clean everything real good while your in there. Blow out the lines and make sure everything flows smooth all the way to the carb......GP http://i187.photobucket.com/albums/x...a/DSC04173.jpg