Jegs Electric Fuel Pump

[friz freleng]

I have a JEGS 555-159068 Universal Marine Electric Fuel Pump 12V [6-8 PSI 72 GPH electric fuel pump on my '73 Ford 302. It runs constantly with power applied. It does not turn off when it reaches a certain pressure. When first turned on, the output pressure is 4 psi which is good for my carb, Edelbrock 1406. Yeah I know the specs say 6-8 psi. The gauge is a $22 Boltigen Fuel Pressure Gauge. After 10 mins of powered on and running without the engine running, the output psi, on the pressure gauge drops to zero. I don't know if this is to be expected as fuel is not flowing through the pump, and it is overheating, or the pump is bad. Any other electric pump I have owned shuts off at a certain pressure if fuel is not flowing through. Maybe I should actually run the engine while the pump is running. I will, but I thought I would ask here first. Thanks