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Terminal 17 on S1 is what powers both the pump and the fuel solenoid valve. Terminal 17 is only energized in the AUX position (12:00 position) but since it must be passed every time the set is started, the pump gets exercised. These pumps have a suction stroke powered by a coil acting on a...

If you disconnect the tank switch (remove Cannon plug) on the 002/003A, the solenoid valve on the third pump should not open, meaning no flow. If the pump has no connection/fuel, the air may allow pump cycling. Jumping connections on the Cannon plug will allow flow. Flow is fast enough to...