GM 25091020 Fuel Tank Meter/Pump SENDER

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The fuel pump is a sealed type actuated from the engine camshaft, utilizing a pushrod between the camshaft and the pump rocker, while 231 V6 engines have pumps driven directly from the camshaft eccentric without a pushrod. Servicing is not possible due to the sealed nature of the unit, but if a fault is suspected, a test can be performed. First, ensure there is gas in the fuel tank and disconnect the primary wire between the coil and the distributor to prevent engine firing when the starter motor is engaged for models from 1969 to 1974; for models from 1975 to 1981, disconnect the distributor wiring marked 'BAT'. Next, disconnect the fuel line from the carburetor and place its open end in a container. Finally, operate the starter motor and observe for well-defined spurts of fuel ejected from the open end of the line; if present, the pump is functioning correctly, otherwise, it should be replaced.

Finally, reconnect the fuel lines, start the engine, and check for any leaks.