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jackduppel
jackduppel, Auto Service Technician
Category: Car
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Experience:  ASE Certified Automotive Technician
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where is the fuel filter located on a 2002 jeep ...

This answer was rated:

where is the fuel filter located on a 2002 jeep wrangler 6 cylender? Also, what is the best way to troubleshoot fault codes p0442 and p0455. Gas cap and seal look good. Vehicle runs great with normal gas mailage (17 mpg on hwy). I need to know how to track these fuel pressure or vacume lines. My son off roaded and did not take care of this vehicle the past two months and now I have it.

revenbob,

welcome to JA,

Unfortunately the only fuel filter on your Jeep is located inside the gas tank - and is not designed for routine service.

 

Hope this helps

 

Jack Duppel

ASE Certified Tech

 

Code info to follow momentarily

P0442 OBD-II Trouble Code

Technical Description

Evaporative Emission Control System Leak Detected (small leak)

What does that mean?

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms

You likely won't notice any drivability problems.

Causes

A code P0442 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal

Possible Solutions

With a P0442, the most common repair is to:

  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses

P0455 OBD-II Trouble Code

Technical Description

Evaporative Emission Control System Leak Detected (no purge flow or large leak)

What does that mean?

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms

You likely won't notice any drivability problems.

Causes

A code p0455 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

Possible Solutions

With a p0455, the most common repair is to:

  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

Hope this info helps you outCustomer

 

Good Luck

Jack Duppel

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Customer: replied 9 years ago.
What about fault code p0455? How do i trace these evap hoses?
Customer

See most recent answer for code P0455.. As far as tracing the evap hoses-- to check them for possible leakage- the easiest way is - with the engine running- spray sensor safe carb cleaner over all the Evap hoses-- if the idle rises- you have found your problem-- The odds are against this being your problem-- Usually these codes occur when the gas cap was not tightened enough after a fill up-- I would visit autozone- they will extract & erase these codes free of charge- then if the codes come back I would further address & diagnose a problem if one exists. Good Luck

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