Why does the fuel pump stay on when ignition is off?
Fuel pump stays on when ignition is off. The trigger for the relay is grounded through the ECM. The ground is provided electronically for a few seconds when the key is turned on and is maintained after that due to a pulse from the ignition module. It could be due to an erratic fault in the ECM.
What should I do if my fuel pump keeps running?
Normally if the starter relay it stuck, the starter will continue to run even with the key off. Either way the fuel tank will probably need to be removed as the relays are under the tank on the right side & the fuel pump & filter hoses access are in the tank on the bottom right side.
Where is the fuel pump in a car?
The fuel pump is in the tank on the lower right side. While the started motor is located just above the transmission on the lower left side where you have your dot. Normally if the starter relay it stuck, the starter will continue to run even with the key off.
Why is the fuel pump still running in my Dodge Daytona?
We changed it n battery was still being drained. It all boiled down to the fuel pump relay. After turn vehicle “off”, keys removed from ignition, we could hear the fuel pump still running. WE removed the fuse, and it’s still running.
What happens when you turn off the fuel pump?
As a car sits, the fuel pressure gradually decreases and modern cars don’t run without fuel pressure. When you first turn the key on your car, the PCM immediately powers the fuel pump to pressurize the fuel system.
We changed it n battery was still being drained. It all boiled down to the fuel pump relay. After turn vehicle “off”, keys removed from ignition, we could hear the fuel pump still running. WE removed the fuse, and it’s still running.
Why does my car not start when I turn the key?
If the switch malfunctions it may permanently disable the fuel pump and produce a no start condition. The engine may still crank when the key is turned however it will not be able to start due to a powerless fuel pump.
What are the symptoms of a bad fuel pump?
One of the first symptoms of a potential issue with the fuel pump shut off switch is an engine that suddenly stalls while driving. 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.
When do you remove power from the relay?
Power should be removed from the relay when the ignition is off. If you keep a relay powered up long enough it will fuse internally and cause the problem you are experiencing. You need a good wiring schematic for your vehicle and check that power is removed from the relay when the ignition switch is “off”.
Why is the fuel pump still running on my 1989 Mercury Grand Marquis?
The fuel pump on my 1989 Mercury Grand Marquis is still running after turning the ignition off, causing the battery to drain. Replacing the fuel pump relay stops this from happening for a short time but it soon reoccurs.
What to do when your ignition switch is off?
You need a good wiring schematic for your vehicle and check that power is removed from the relay when the ignition switch is “off”. A Haynes or other repair manual for your vehicle will have the needed info.
What happens when you remove the fuel pump key?
When the key is removed from the vehicle, the fuel pump will continue to run. In this article & video the diagnosis and repair of the faulty internal fuel pump relay will be covered. If playback doesn’t begin shortly, try restarting your device.
Where is the fuel pump fuse box located?
The engine’s or the dashboard fuse box is usually a long black box containing a fuel pump relay and various other fuses and relays. For different vehicles, the fuel pump relays can be located in different places.
Where do you find the fuel pump relay?
When you shut off the ignition, it powers down the fuel pump. In most vehicles, the fuel pump relay can often be found in the fuse box in the engine bay, which is usually a long black box which contains fuel pump relay along with various other fuses and relays.
How do you clean a fuel pump relay?
Since any debris will affect the fuel pump relay’s performance, you should regularly inspect and clean it when necessary. The fuel pump relay is an electrical car part, thus be extremely careful when handling a relay. First, take off the relay and use the blower to blow off dirt and dust for about 1-2 minutes.