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Old 11-19-2010, 12:14 PM
Texas001 Texas001 is offline
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Default Check Fuel Cap/Check Engine Light

Got an check engine light. Code reads P0455. Found this about a F150:

First, the Canister Vent Solenoid is closed to seal the entire evap system, then the VMV or EVMV is opened to pull a 8" H2O vacuum. If the initial vacuum could not be achieved, a large system leak is indicated (P0455). This could be caused by a fuel cap that was not installed properly, a large hole, an overfilled fuel tank, disconnected/kinked vapor lines, a Canister Vent Solenoid that is stuck open, a VMV that is stuck closed, or a disconnected/blocked vapor line between the VMV and the FTPT If the initial vacuum could not be achieved after a refueling event, a gross leak, fuel cap off (P0457) is indicated and the recorded minimum fuel tank pressure during pulldown is stored in KAM. A “Check Fuel Cap” light may also be illuminated.

If the initial vacuum is excessive, a vacuum malfunction is indicated (P1450). This could be caused by kinked vapor lines or a stuck open VMV. If a P0455, P0457, or P1450 code is generated, the evap test does not continue with subsequent phases of the small leak check, phases 1-4. Note: Not all vehicles will have the P0457 test or the Check Fuel Cap light implemented. These vehicles will continue to generate only a P0455. After the customer properly secures the fuel cap, the P0457, Check Fuel Cap and/or MIL will be cleared as soon as normal purging vacuum exceeds the P0457 vacuum level stored in KAM.

And:

Note that a stuck closed VMV generates a P0455, a leaking or stuck open VMV generates a P1450.

And:

The Canister Vent Solenoid output circuit is checked for opens and shorts (P1451 or P0446), a stuck closed CVS generates a P1450, a leaking or stuck open CVS generates a P0455.


Now how can I relate this to my Ranger? I first got the check fuel cap light. Then about a day later I got the check engine and check fuel cap light together. I replaced the fuel cap, disconnected the battery and reconnected and both lights turned off. After about 4 hours of driving the check engine light came back on. The read out code is P0455.

Can anyone, and I am sure there is someone who can, tell me how to walk thru a test of each solenoid or valve to find it there is still a problem or how to determine that it only needs the check engine light to be cleared now that the check fuel cap is no longer the problem. Pictures would also be appreciated. Thanks
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Old 11-19-2010, 12:27 PM
STL STL is offline
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Default Re: Check Fuel Cap/Check Engine Light

Check for a hole/clog in the vent tub on the fuel filler neck.
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Old 11-19-2010, 01:00 PM
Texas001 Texas001 is offline
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Default Re: Check Fuel Cap/Check Engine Light

Quote:
Originally Posted by STL View Post
Check for a hole/clog in the vent tub on the fuel filler neck.
Thanks I can do that.

Someone told me that if you overfill it can cause a problem. I am prone to do that and will quit that habit.
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Old 11-19-2010, 01:09 PM
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Default Re: Check Fuel Cap/Check Engine Light

outlined in red is the vent tube.

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Old 11-19-2010, 08:30 PM
Texas001 Texas001 is offline
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Default Re: Check Fuel Cap/Check Engine Light

All the vacuum lines are good. I don't know how to test any of the solenoids or sensors involved in the whole fuel evac system. Does the Check Engine light need to be cleared with a code reader and reset tool or does disconnecting the battery do that?
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Old 11-19-2010, 08:57 PM
2002 2WD Edge 2002 2WD Edge is offline
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Default Re: Check Fuel Cap/Check Engine Light

Quote:
Originally Posted by Texas001 View Post
All the vacuum lines are good. I don't know how to test any of the solenoids or sensors involved in the whole fuel evac system. Does the Check Engine light need to be cleared with a code reader and reset tool or does disconnecting the battery do that?
Well try disconnecting the negative terminal..leave it off for a few minutes just to be sure. If the check engine light still comes on then try clearing it with a code reader. I don't have one...I assume they can do that. My Superchips Flashpaq programmer can. The check engine light will come on for low fluids, dirty MAF sensor and a few other things. Error codes don't always point to the culprit. Lots of oxygen sensors that are OK have been replaced for example.
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Last edited by 2002 2WD Edge; 11-19-2010 at 08:59 PM. Reason: re-wording
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Old 11-20-2010, 05:41 AM
STL STL is offline
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Default Re: Check Fuel Cap/Check Engine Light

You can go to autozone. They will give you a code reader to find the problem then you can clear it.

Orielly auto parts does the same thing.

You can get code readers from harbor freight for about 20 bucks.
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Old 12-25-2010, 05:52 PM
Texas001 Texas001 is offline
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Default Re: Check Fuel Cap/Check Engine Light

This check fuel cap light kept coming on. I would disconnect the battery and it would clear but after a few days would come on again. I bought a code reader. Then it came on again and I read the code. P0455, same as before. I cleared the code with the code reader and it has not come back on. I stopped filling the fuel tank after the nozzle clicks off and all seems to be okay now, he said crossing his fingers.
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Old 12-30-2010, 10:57 AM
kevinb kevinb is offline
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Default Re: Check Fuel Cap/Check Engine Light

1998 ranger xl gas cap makes a farting sound,any ideas

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it's a 3.0
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Old 12-31-2010, 11:03 AM
Texas001 Texas001 is offline
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Default Re: Check Fuel Cap/Check Engine Light

Quote:
Originally Posted by kevinb View Post
1998 ranger xl gas cap makes a farting sound,any ideas

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it's a 3.0

Farting sound?? I guess it has gas.

Gas tank is building pressure and it is being released around the rubber washer on the cap. I think that the canister has a relief valve (solenoid controlled I believe) and should relieve the pressure but this valve may be stuck or clogged with dirt as the canister is up under the bed. Better check this out as I am not speaking from experience or detailed knowledge, just common thinking. I have read that many cars and trucks have a similar condition where the gas cap makes noises. Search "gas cap making noises" and see what I mean by many cars and trucks.

I don't think it is a serious problem unless the relief valve is kapoot.

Last edited by Texas001; 12-31-2010 at 12:51 PM.
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