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The pumps use a solenoid to return a piston and compress a spring. The spring then pushes the piston, which pumps fuel. If the output is blocked, the spring pushes the piston slowly, since its movement is only from leakage around it. When the piston reaches the bottom of its stroke, an...

Here's one place selling it: https://solarconduit.com/shop/generator-start-control-module-gscm.html You can get a generic programmable controller like an Omron Zen cheaper, but this controller might eliminate the need for some of the relays you'd need with a PLC. You'd still need things like...