The fuel vapor leak detection pump, also known as the evaporative system integrity monitor (ESIM) or leak detection pump (LDP), is a crucial component of the evaporative emission control (EVAP) system in your Jeep Wrangler JL. Its primary function is to detect any leaks in the EVAP system, which helps prevent fuel vapors from escaping into the atmosphere.
Location of the Fuel Vapor Leak Detection Pump
On a Jeep Wrangler JL, the fuel vapor leak detection pump is typically located behind the rear passenger fender liner, tucked away in the top of the fender. It is positioned on the right side of the vehicle, near the fuel tank.
To access the pump, you will need to remove the rear passenger wheel and partially remove the fender liner. This process may involve removing several clips and a bolt above the pump location4. Once the liner is out of the way, you should be able to see the pump and its connections.
Replacing the Fuel Vapor Leak Detection Pump
If your Jeep Wrangler JL is displaying a trouble code related to the EVAP system, such as P0455 or P0456, it may indicate a large or small leak, which could be caused by a faulty fuel vapor leak detection pump4. Replacing the pump can be a DIY project, depending on your mechanical skills and tools.
To replace the pump, you will need to disconnect the electrical connector and fuel vapor lines from the old pump. The pump is typically held in place by a few screws or bolts, which you can remove using the appropriate tools4. Once the old pump is out, install the new one and reconnect the electrical connector and fuel vapor lines. Be sure to secure the pump properly and reinstall the fender liner and wheel.