Question about 1998 Ford Explorer

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1998 ford explorer gas canistor prtoblem

When i went to get my Explorer inspected the guy said there is a large leak usally in gas canistor but he does't know where it is or how to test it. I also read that it may be the gas cap. Can someone please let me know if they have had the same problems and how they fixed it. Thanks. Robert

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There is a system for removing vapors from your fuel tank to protect the environment.
As u use up gas, the tank has more space to accomodate vapor from the gas. When u fill up, this could expand out thru the gas filler pipe and in the air, and be potentially dangerous.
So there is a pipe that leads from your tank to a charcoal canister. A pressure sensor reads the excess pressure in your tank, then opens an electrically controlled valve to allow the vapor to pass thru the charcoal canister, cleaning out the dirty pollutants, and releases the gas into the atmosphere.
A faulty gas cap means that the pressure sensor never reads any pressure and tells the computer that the valve has not opened. The computer then throws up a code indicating an evap leak.

So 1st, as your man said, change the gas cap. Have the engine light switched off at your local garage, or autozone, then drive and see if the light comes back on.
If it does, the evap canister for your vehicle is slightly behind the fuel tank. The spare wheel need to be removed, then the evap canister can be checked out. There are 2 or 3 bolts holding it on. It should be lowered and all the pipes inspected for leaks. Many garages will check for this leak for you with a smoke machine.

Last one I fixed had the inlet pipe eaten by a mouse/rat.. there may be some odour that attracts them. Cracked pipes are common.

Hope that helps some....

Posted on Jan 13, 2009

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How can I fix the problem for code P0455 - Evapororative Emission Control System Leak Detected (Gross Leak)?


The On Board Diagnostics have detected problems in the Evap System . A PO455 will be set during operation of engine coolant and air temp are within 10 degrees of each other and the fuel tank is between 15% and 85%. and monitors leaks using the fuel tank pressure sensor. After meeting the criteria it runs the test in 30 seconds. Now the hard part is finding leaks.#1 KEEP FUEL LEVEL in testing range #2 leak can be the gas cap Check how is seals against the filler neck and the gasket for tears #2 inspect filler hose for stains and loose clamps #3 inspect hoses from fuel tank to Evaporate Canister and then to engine compartment Any split or loose hose can cause a gross leak. Most Shops use a smoke machine and add where the green service port is located under hood the service valve is LEFT HAND THREAD so be careful not to strip out accidentally.After finding and repairing leaks clear codes by disconnecting battery or using code reader. let the car test itself a readiness screen on scanner will let you know if the system has passed its test.

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My ford explorer sport trac 2001 shows codes 455 and 457, check engine on


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)
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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.

P0457 can set by itself if the gas cap is left loose. when the engine controller sees a large increase in fuel level it knows you put some in the tank, and it runs the evaporative emissions system test to see if the system is sealed. If it sees a large leak it knows the cap was left off and sets the P0457. If you are positive the cap wasn't left even a little bit loose you may have a leak back there. It could be in the filler neck, from the tank to the evaporative emissions canisters, and from there on up to the purge solenoid. If you don't see any leaks you probably have a bad NVLD, the unit that checks the system for leaks.

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