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Discussion Starter #1
I know we have some auto mechanics in our ranks. Can anybody explain how I can clear the gas tank vent in my 2002 Hyundai? The last couple of fill ups, the pump keeps shutting off like the tank is full, when it clearly isn't.
 

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The vent system on cars after 1996 are pretty complicated. All kinds of gismos to comply with emissions. It may take some complicated diagnostics to figure it out. One of the last things I did before retiring was to replace the tank on a Honda pilot for that problem. There is a valve inside it that was bad and not replaceable.
 

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On one of my cars, I just drilled a hole in the neck up high to let it vent out...

I didn't give a crap about EPA laws.
That would definitely cause the check engine light to come on.
 

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sometimes u can fix a clogged vent. Sometimes u can reach them without dropping the tank. If not drop the tank and find it. I know on fords it or they can be cleaned.
 

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Discussion Starter #7
So, it's not going to be as easy as pressurizing the tank?
Is this a job for the dealer only? That gets spendy, real fast.
The car has to get tested bi-annually. Will a clogged vent send up a fault code?
 

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So, it's not going to be as easy as pressurizing the tank?
No, don't waste your time there...

Is this a job for the dealer only? That gets spendy, real fast.
No, you can do it.
At most, a few hundred.

The car has to get tested bi-annually. Will a clogged vent send up a fault code?
Yes.

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I would look into somehow testing the charcoal canister and its interconnecting lines.
Don't know exactly where it is, but I"m guessing under the hood, drivers side wheel-well area.
Compressed air to disconnected lines only. Don't pressurize anything.
I would think that there is some sort of monitoring of that system, directly or indirectly, that would throw a soft code of some sort..
 

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So, it's not going to be as easy as pressurizing the tank?
Is this a job for the dealer only? That gets spendy, real fast.
The car has to get tested bi-annually. Will a clogged vent send up a fault code?
No,do not do that, it could ruin the fuel tank pressure sensor. Most independent shops should have the equipment and info to do it but they might not want to. Evap emission testing can be very frustrating. No that particular vent shouldn't set a code.
 

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Discussion Starter #15
I'm back. I finally got around to taking the car into a dealer. They say the charcoal canister and the diagnostics module have to be changed. $720 + tax and labor. That's probably half the value of the car.
It did not throw a fault code, so it should get past emissions testing.

The canister can be gotten as aftermarket, but with no real savings. I think I'll take it out and analyze the possibility of repairing it.
The module is dealer only and at $525 I will wait until the canister is working to determine whether the module's actually dead. The mechanic said the little pellets from the canister get into it and plug it up. I'm hoping it can be unplugged.
 

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I'm back. I finally got around to taking the car into a dealer. They say the charcoal canister and the diagnostics module have to be changed. $720 + tax and labor. That's probably half the value of the car.
It did not throw a fault code, so it should get past emissions testing.

The canister can be gotten as aftermarket, but with no real savings. I think I'll take it out and analyze the possibility of repairing it.
The module is dealer only and at $525 I will wait until the canister is working to determine whether the module's actually dead. The mechanic said the little pellets from the canister get into it and plug it up. I'm hoping it can be unplugged.
I would have to ask what the #@&! has the canister have to do with the diagnostic module? A bad canister will most definitely set a fault code so I would have to question that too. How can pellets go through wires anyway?
 

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I too, don't follow any of that reasoning.

Once the sensor in the canister has done its' job, that is all she wrote.

From there to the module is just some wires.... nope, not believing him.
 

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And the canister couldn't cause the problem you have anyway.
 
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