Whenthe ECM receives the crank signal, it activates the fuel pump relay by either controlling power to the control side of the relay, but more commonly, the ECM controls the relay by supplying aground. That wasn't so bad. Nice work! Sum Up. Checking the fuel pump fuse is a simple process that can be done with basic tools. Thiswill pull in the fuel pump relay and you SHOULD get 12VDC at the fuel pump connector with the ingnition switch ON. If it passes this test, the fuel pump relay CONTACTS AND COIL are working. If it fails this test , you probably have a BAD Fuel Pump RELAY. Remove the jumper from the FP and Gnd terminals of the diagnostic connector. 6. EngineStops. The engine may start for a moment or two and then abruptly stop without ever leaving the driveway. This may be due to a lack of continual fuel feed from the gas tank. This indicates a problem with the fuel filter, fuel pump or fuel relay. A faulty fuel pump relay can cause the car to come to a complete stop while driving. FuelPump Relay Issues. Another potential cause for bad fuel pump symptoms is a faulty fuel pump relay. This relay controls the power supply to your Equinox's fuel pump, and a faulty relay may lead to: Intermittent power loss to the fuel pump; Inability to start your vehicle; Unpredictable pump operation, leading to stalling or rough running Ive read some threads that it may be a bad fuel pump?? Any help would be great.. Kcr, Jun 5, 2019 #1. just curious. check your fuel pump relay module fuse. does it look burnt? change it and see how it behaves. FirstPriority, Jul 7, 2019 #3. mbs33409 My truck does the same thing. I also believe its a fuel pump issue. Thepump will run for ten seconds (time varies with coolant temperature) and then shuts off. During the run time if the ECM does not detect crankshaft rotation it switches the fuel pump relay off. The key must be OFF for at least 10 seconds and then cycled ON before the ECM will restart the fuel pump. The ECM receives a 12 volt signal on pin E 27rdk.

when a fuel pump relay is bad