For some unknown reason my fuel pump keeps running while the battery is hooked up without a key in the ignition. The fuel pump is draining the battery.
Troubleshooting Symptoms That May Mean A Bad Fuel Pump
What would cause a fuel pump to keep running. 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. It started this about 2 days ago. Suspect fuel pump relay failure. Fuel pumps themselves dont know when to shut off. The most common cause is a hole in the drop pipe down the well. If you make a habit of running your tank all the way to empty before filling up.
But this should blow the fuel pump fuse before meltdown occurs. The are two main components that make most fuel pumps run. Ok4450 july 6 2016 107am 11. 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. They are entirely dependant on the fuel pump relay to provide them with power or remove their power. Your fuel pump will most likely die before its designed lifespan.
This problem is caused when the fuel pump cant deliver a smooth flow of fuel to the engine. 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. I ended up having to disconnect the battery when it finally stopped turning its self off. Switch that trips for no reason. A timer circuit in the pcm will open the ground circuit to the fuel pump relay causing the fuel pump relay contacts to open.
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 action stops the power supply to the fuel pump. The fuel pump keeps cool by staying submerged in fuel or else it would overheat. When this happens there are typically two common causes. The pcm powertrain control module and the fuel pump relay. Fuel pump is running even when the vehicle is off.
This interruption in fuel flow causes your engine to skip several power strokes forcing the engine to sputter and jerk. It only ran for about 15 min or so but would cycle on and off all day and all night long. Periodically your engine receives only air when it was expecting to receive fuel. The fuel pump run continuously with your engine delivering high pressure fuel to the fuel rail and injectors. Pump continues to operate with relay contacts closed relay is located in under hood fuse relay box. Update from nov 7 2018.
Relay contacts can become fused together resulting in a closed fuel pump feed circuit. We were able to bypass the fuse by running a bypass line purchased online at.
Gallery of What Would Cause A Fuel Pump To Keep Running
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