Fuel pump is running even when the vehicle is off. The fuel pump run continuously with your engine delivering high pressure fuel to the fuel rail and injectors.
How To Diagnose A Fuel Pump Failure Ericthecarguy
What would cause a fuel pump to keep running. When a well pump is running all the time and will not shut off the most common reason is that the well pump is not able to build enough pressure in the system to tell the pressure switch to turn the well pump off. This interruption in fuel flow causes your engine to skip several power strokes forcing the engine to sputter and jerk. The pcm powertrain control module and the fuel pump relay. Fuel pumps themselves dont know when to shut off. We were able to bypass the fuse by running a bypass line purchased online at. Suspect fuel pump relay failure.
Switch that trips for no reason. When this happens there are typically two common causes. A timer circuit in the pcm will open the ground circuit to the fuel pump relay causing the fuel pump relay contacts to open. The fuel pump keeps cool by staying submerged in fuel or else it would overheat. This problem is caused when the fuel pump cant deliver a smooth flow of fuel to the engine. Update from nov 7 2018.
I ended up having to disconnect the battery when it finally stopped turning its self off. But this should blow the fuel pump fuse before meltdown occurs. The fuel pump is draining the battery. This action stops the power supply to the fuel pump. Since you now have 3 relays open one of them up and look for fused burned melted partsif so there is a short in the fuel pump circuit or the pump itself is drawing way to much power overheating the relay. The fuel pump may be reactivated by finding and pressing the reset button for the switch.
When the ignition switch is turned to the start position the pcm closes the ground circuit to the fuel pump relay resuming operation of the fuel pump. It started this about 2 days ago. The most common cause is a hole in the drop pipe down the well. Periodically your engine receives only air when it was expecting to receive fuel. If you make a habit of running your tank all the way to empty before filling up. Ok4450 july 6 2016 107am 11.
Your fuel pump will most likely die before its designed lifespan. They are entirely dependant on the fuel pump relay to provide them with power or remove their power. It only ran for about 15 min or so but would cycle on and off all day and all night long. Pump continues to operate with relay contacts closed relay is located in under hood fuse relay box. The are two main components that make most fuel pumps run. If the fuel pump shut off switch malfunctions while the engine is operating it may shut off the fuel pump and cause the engine to stall.
For some unknown reason my fuel pump keeps running while the battery is hooked up without a key in the ignition. Relay contacts can become fused together resulting in a closed fuel pump feed circuit.
Gallery of What Would Cause A Fuel Pump To Keep Running
