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It's also a good idea to wrap a thick absorbant rag like part of an old towel around the air purge button just under the gauge when pressing it to purge any air out of the line, so gas doesn't spray or gurgle all over the place.
If you turn the inline ball valve to cut off fuel flow through the control pressure return line >for checking system pressure the motor should be off.
If the motor is running and you do that it will stall out the motor.
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