How To Test, The Relay, The Quick Method: This means your fuel pump will, cease to function properly. So, when either of these begin to fail the current to the electrical circuit, will also fail. Consequently, the most common parts to burn out or break are usually the contacts and the coil. Fortunately, it does not have many parts. So, testing the relay of a fuel pump, is relatively simple. Next, check all fuses, before any repairs.Clean corroded terminals and socket with, electrical contact cleaner.Because, corrosion and overheating can prevent, proper current flow and indicates problems.Pull out the relay and visually inspect, the terminals and socket for signs of corrosion and overheating.When Troubleshooting, Always Start With A Visual Inspection: Burnt Fuel Pump Relay So, if the relay fails, it will cut power to the fuel pump, which will render it inoperable. Most fuel pumps, will produce a low volume hum, when turned on. No Noise From Relay Or Fuel Pump, When The Key Is Switched On But, this is only one of many other problems, that may be at fault. Engine Not StartingĪ faulty relay, can often prevent starting. As a result, producing intermittent starting problems. However, when the relay contacts cool, it will resume the flow of electricity. Also, if a relay overheats, the electrical contacts inside the relay can short circuit causing the electrical flow to stop. Consequently, if the fuel pump relay has an issue, it will cut off power to the fuel pump. One of the first symptoms of an issue with the relay is, an engine that suddenly stalls. Usually A Bad Or Failing Fuel Pump Relay Will Produce A Few Symptoms That Can Alert The Driver Of Issues: Engine Suddenly Stalls In addition, a fuel pressure sensor, lets the computer know if the fuel pump, has not created any pressure, during cranking operation. Consequently, if it fails, the engine management system, records this event.

Because, it is part of the control system of a fuel pump, its failure can lead to start up problems.

Testing fuel pump driver module