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Check engine light with "gas cap" code is on and gas tank from time to time overflows after fill up. What could be the problem?

I bought a new gas cap from jeep and replaced the old one with it and cleared the code but it did not fix the issue.

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  • bunnythought
    bunnythought Jan 06, 2013

    I am new to this site and some how left out the make and model. 2007 Jeep Wrangler Unlimited Rubicon

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1 Answer

You need to have the Evap System properly
diagnosed, to find any issues ,never install parts
to resolve any vehicle issues

You find the problems first

Any evap leak or loss of pressure, could set the gas
cap light
That doesn't mean it is the problem with the system

Posted on Jan 06, 2013

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Pops65Pony
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SOURCE: Check Engine Light won't go off

If you have an Advance Auto Parts store where ever you are, they will read the code and tell you exactly what to code is and what it means. Any mechanic who "guesses" isn't a mechanic at all - he's a thief. Emissions leak can be any number of things, but not the gas cap!

Posted on Aug 21, 2009

emissionwiz
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SOURCE: check engine light on after

You have a leak in the fuel system somewhere or a bad evaporative system sensor, the way the system works is the control module for the emission system pulls a vacuum on the gas tank and lines to check for leaks, if it can't get a certain vacuum level for a specified time it decides there is a leak and the check engine light comes on. This may be covered under the Federal Emissions warranty, call the dealer and inquire if the Evap System is covered.

Posted on Aug 27, 2008

Shouldibuyit
  • 44 Answers

SOURCE: smelling gas when just filled up tank on Ford Focus 2000

Now, in the past year, when I fill the gas tank, I can smell gas fumes inside the car (remember, it's a wagon).
I have a lot of customers that run into this problem and get the same answers from the dealers.
Given the age of the car and that it has been in a accident, here is what I would look for first.
1. First, because of the accident I would look to see if all the work was performed properly around the gas tank. Check the filler neck to make sure that all hoses and clamps are tight and in good shape, if cracked or it has any bad spots in it, replace it. The tech. that repaired the car could have missed something by accident; this is always a good place to start with by double-checking the work that was done.
2. I've had the Fuel Pump replaced twice due to recall. Another possibility, when they installed the fuel pump they may not have put the seal in right or it could have slipped. There is usually a rubber ring that goes between the tank and the pump and it might have moved during installation. When you fill the tank to the top it may come out because the seal slipped out of position.
3. I'm not sure on this model but on a lot of the newer cars they have been mounting the charcoal canister in the quarter panel next to the fuel neck but it may be hidden behind a plastic cover. The charcoal canister may have been damaged from the accident or it could just be defective and when you fill the tank up it may be going into the canister and fumes are coming from it or gas may be leaking out of it.
4. I have found that some of my customers have been over filling the tank trying to put as much as they can squeeze into the tank, this is not a good idea. When it gets hot outside, the gas expands and has no where to go except into the canister or lines of the canister, this system is not meant to handle gas, it is only meant to handle fumes. You will smell gas if you try to over fill the tank. When you fill it at the station you should let it click off. Just try rounding it off to the fifty cent mark, (example: $10.03 only go to $10.50 not $11.00) this will help you to keep from over filling the tank and neck of the tank. Over filling the tank can clause damage to the canister and components in this emission system.
These are things that the average person with some mechanical knowledge can check out on their own. After this point, it will usually have to be looked into by a fully qualified tech. with good trouble shooting skills that can follow the flowcharts to find the problem.

Posted on Oct 28, 2008

StormStrikes
  • 104 Answers

SOURCE: Check Engine Light Comes on Intermittently

The P0141 code points to the O2 sensor heater circuit. It could be that there is a short in the wiring to the O2 sensor or it could be that the O2 sensor heating element itself is bad. The code is for O2 sensor Bank 1 Sensor 2. Bank 1 means its the O2 sensor connected to the exhaust pipe that runs to cylinder #1. Sensor 2 means that it is likely the O2 sensor after the catalytic converter on the same exhaust pipe.

Posted on Dec 31, 2008

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SOURCE: Re: 2001 Subaru Forester - check engine light won't turn off

undo the negative battery terminal for around 10 to 15 minutes and then put it back on and the light should be out. it resets the computer

Posted on Mar 12, 2010

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It could be an emmissions problem. Sometimes even the gas cap being loose can cause a code. Make sure to tighten the cap when done refuelling...you should hear repetitive clicks when its tight. Other components related to code p0172 are o2 sensor(bank 1) and catalytic converters. Hope this helps!

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Hi, first off don't ever top off your tank I don't know who told you to do this but this is a bad thing. This by itself will cause your engine MIL to come on most likely with a code PO455 large evap system leak. by topping off your tank you are installing a problem on your own vehicle what happens is as the gas heats up it expands normally there is enough room at the top of the tank to stop overflow, but when topped off it overflows into the charcoal canister and starts leaving a caron buildup in your granulated charcoal and will render it useless and a replacement will be necessary. also make sure you clean your gas cap off very well with alcohol. As this by itself can cause your MIL to turn on intermittently and set a PO442 small evap leak code.

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