If the fuel pump comes on and functions properly, the fault is neither the pump nor the wiring from the relay to the pump. You can also manually close the contact on the test relay by pressing the points closed with your finger.This will allow you to see if the relay’s coil energizes and shuts the contact when that particular circuit is energized. A great way to test a circuit is to remove the top of a relay and simply look inside. If voltage and ground are not present while the vehicle is being cranked, check to see if the fuel-pump relay is being energized.If voltage and ground are present, the fuel pump has an internal failure and will need to be replaced. If the vehicle does not start, check for battery voltage and ground at the fuel pump using a Digital Volt Ohm Meter (DVOM) while someone cranks the vehicle.If the vehicle starts, the pump has an internal failure and will need to be replaced. If not, tap on the pump while someone cranks the engine. Next, have someone turn the key to the Run position and see if the pump activates.
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