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I run both an electric and mechanical in series. I routed a bypass line with a one-way check valve around the electric so the mechanical can pull around it. I only use the electric to prime and at the racetrack. I switch it on just before I stage the car. The electric is mounted on the front...

If you have a hand vacuum pump, Hook it up to the diaphragm. When you squeeze the vacuum pump, if the secondary's open, it's working.