The evaporative emission system is designed to prevent the escape of fuel vapors from the fuel
system. Leaks in the system, even small ones, can allow fuel vapors to escape into the
atmosphere. Government regulations require onboard Testing to make sure that the evaporative
(EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks
and blockage. It also performs self-diagnostics. During self-diagnostics, the Powertrain Control
Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults.
If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the
system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace
the air that leaks out. The PCM determines the size of the leak based on how fast/long it must
pump the LDP as it tries to maintain pressure in the system.
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Detailed Instructions
1 Check off all items against Snorkel Kit List.
2 Remove guard liner, front rubber and windscreen washer reservoir.
3 Tape Template together accurately on gridline 17. Cut down grid line 28 to mark.
4 Place the Airflow Template supplied on the guard, ensuring the guard crease line are followed exactly. The top guard edge line is a guide only as it will vary slightly between pre and post 1997 cherokee’s.
5 Tape over the sites of all hole points to protect the guard. Locate holes as indicated and mark with centre punch. Drill the 8mm holes. Be careful of any wires or other obstructions under the inner guard.
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