How does a fuel vapor leak detection pump work?
This system works by pumping pressurized air into the EVAP system to test it for leaks. The pump has a series of one-way valves and a vent valve, a sensor at the top, vacuum solenoid and a spring-loaded diaphragm. It uses an engine vacuum to move the diaphragm up and down.
What does ESIM stand for Jeep?
Evaporative System Integrity Module
The Evaporative System Integrity Module, also known as an Evaporative System Integrity Monitor or ESIM, is a key component of the EVAP System on many late model Chrysler, Dodge, Jeep, RAM Trucks, and Fiat vehicles. Unlike previous Leak Detection System, the ESIM does not contain a solenoid.
How to check for EVAP leak in Jeep Wrangler?
Basically, you send smoky air through the EVAP system, grab a strong flashlight, and look for a leak very carefully. Professional smoke test machines are commonly used to diagnose EVAP system leaks in all modern vehicles that have these blasted abomination EVAP systems.
Where is the gasket on a Jeep Wrangler?
There is a little green gasket between the EVAP canister and the little white box (EVAP Leak Detection Pump) attached to it. This gasket is critical – otherwise, it will leak. I personally put a little bit of silicone grease on the gasket to ensure it has a good seal. If you loose it or the gasket isn’t in good condition, replace it. No dice?
How to clear gas cap on Jeep Wrangler?
You can clear your gas cap message but clicking the little odometer reset button in the dash. Of course, if the issue still exists, it’ll come right back next time you start the Jeep.
Where is the purge valve on a Jeep Wrangler?
Check your hose near your battery. There is a black plastic hose that runs to your Purge Valve (a part of the EVAP system) that runs directly next to the right side of your battery. In fact, it touches it, and many folks have issues with the back side of this plastic hose corroding/rubbing till it causes a small pinhole.