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In the 1971 31 ft Chris Craft Commander, there are two round 50 gallon gas tanks that have electric sending units that send the message concerning the amount of fuel remaining in the tank to one gauge on the instrument panel that has a single toggle switch that enables the gauge to read the remaining fuel in either the port and starboard tanks. I am getting no signal on the port or starboard tank when the toggle switch is manipulated.
When working to remove the sending units from the top area of the tank, to permit inspection of their condition, a series of small brass screws must be removed. The small brass screws that hold the unit to the tank are shearing off. At this point I am preparing to empty the fuel from each tank and remove the tank from the hull to permit drilling out the broken screw(s). I would like to avoid removing the tanks.
One: Does anyone help by giving suggestions on action that can be taken to remedy my problem? At present the problem appears to be a malfunction of the sending units.
Two: Does anyone know about a procedure that can be used to remove the sending unit from the tank without removing the tanks from the hull area.