Question about 1998 Buick Century

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Evap leak in fuel

Auto zone said i had a evap leak how can i fix it

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  • Denny152 Dec 02, 2008

    I have had a problem with the check engine light since my 1998 Mazda Protege was new. Dealer said that it just went on because of fuel cap.
    Had the code printed out from Auto Zone and it says that it is and Evap leak. I have replaced the fuel cap. I believe in the past that I have replaced the cat.
    Will the emission system smoke test tell me if it is the cat if it went bad?

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The the plastic that the cap goes in . that is in the gas tube . will leak around where it is presses in you will find a little rust on the tube just inder the cap causing a small leak . just had one done. with smoke test. blamed new cap till we found the rust around the tube to plastic where the cap goes into . a ridge of rust . so a small leak. need to replace tube or seal the tube/ plastic just inside gas opening .

Posted on Jul 31, 2012

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Remove the gas cap and re-install it making sure that you hear it click several times. What your evap leak could be is the gas cap allowing gas fumes to escape. All it takes is a .040 leak to turn on the engine light. If it persists you'll have to have the emission system smoke tested. What happens is the system is literally filled with smoke and the leak will be found by where the smoke comes from.

Posted on Nov 23, 2008

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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.
code P0442 most likely means one or more of the following has happened:
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  • 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
With a P0442, the most common repair is to:
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Your problem is in the evaporative emission system which 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. The light coming on can be caused by one of the following:

1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
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Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

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