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-   -   Stinking Gassy Corolla (http://www.risingsun4x4club.org/forum2/showthread.php?t=19965)

Rezarf 07-21-2013 09:43 PM

Stinking Gassy Corolla
 
Hey guys and gals...

My 1995 Corolla is stinking of gas when I get out of it after some driving. I have seen no drop in power or mileage... its hard to tell where the gas smell is coming from. I don't see any obvious leaks, there is no sign of anything leaking/dripping. But the fuel smell is really strong after a little driving.

Thoughts on what to start checking?

loudbay 07-21-2013 11:44 PM

Charcoal canister / egr recirculating valve....

DaveInDenver 07-22-2013 06:14 AM

Quote:

Originally Posted by loudbay (Post 236454)
Charcoal canister / egr recirculating valve....

These would be my first check, too.

Rzeppa 07-22-2013 09:21 PM

It wishes it were an FJ40 ;-)

AxleIke 07-23-2013 10:53 AM

Yup. Charcoal canister. In addition, check to be sure your exhaust hasn't pushed up too near the tank (shouldn't be close as I think its on the opposite side of the car). The heat from the exhaust will heat the tank and cause excess pressure which will push gas out of the canister too. Had this happen once.

Rezarf 07-23-2013 05:10 PM

Quote:

Originally Posted by loudbay (Post 236454)
Charcoal canister / egr recirculating valve....

Sweet, thanks I'll look there first.

Quote:

Originally Posted by Rzeppa (Post 236504)
It wishes it were an FJ40 ;-)

My 40 always stinks of gas:hill: I think I have a normal 40, but on the corolla the it's just weird!

Quote:

Originally Posted by AxleIke (Post 236526)
Yup. Charcoal canister. In addition, check to be sure your exhaust hasn't pushed up too near the tank (shouldn't be close as I think its on the opposite side of the car). The heat from the exhaust will heat the tank and cause excess pressure which will push gas out of the canister too. Had this happen once.

The exhaust runs on the other side of the tank, but I will look and make sure it hasn't got knocked around. Thanks Isaac.

RockyMtRunner 07-28-2013 08:05 AM

Yep, the canister most likely. I damaged the one in my 3rd Gen 4Runner by over-filling the fuel tank and then tipping the rig every which way while wheeling. The charcoal becomes saturated and ruined. What you are smelling is probably fumes from the feedback system, not dripping gas. Hot weather makes it smell worse. I had to replace the canister; then good again. When the gas pump clicks off the first time, stop filling. Only my opinion, for it's worth.

PabloCruise 07-29-2013 05:24 AM

So the charcoal cans do go bad?
There is a difference in smell between raw gas, and gas vapors from the charcoal canister.
My wife's Camry has a gassy smell, but it smells like gas vapor from the can. I checked all the lines to and from the can, and they look intact, so it left me scratching my head...

DaveInDenver 07-29-2013 06:30 AM

Charcoal filters can sorta go bad, they have two or three check valves that control the flow. The concept is to absorb excess gas and return it to the tank or as vapor back into the combustion process when possible. They store the fuel with activated carbon, which provides a lot of surface area in a small volume. If you continually saturate the carbon that also ruins it eventually.

Diagnosis is to put low pressure on the tank port and listen for the check valve to click open and close when you remove the pressure. It should be a distinct click. You then put low pressure on the purge port (the one to the throttle body) and should get no flow from either the tank or atmospheric ports. If it fails either of these test the book says to replace it.

But, you can clean them sometimes by using the purge process. My '91 FSM says to purge a saturated can you use 43 psi of air pressure on the pipe that goes to the tank, plugging the purge pipe to the throttle body and allowing air to flow from the atmospheric port on the bottom (this is normally where the smell comes from).

Apparently if you're careful you can spray carb cleaner into the tank and purge ports to de-gum the the check valves. Never tried this, so don't know if it works or not.

http://www.autoshop101.com/forms/h62.pdf

http://www.bobistheoilguy.com/forums...Number=2367070

PabloCruise 07-29-2013 11:02 AM

Thanks Dave.
In my unique way of thinking, I wonder about creating a vacuum on the purge port to pull fresh air through from the atmospheric opening on the bottom (that sounds weird) through the charcoal.
I am very hesitant to use a shop vac to pull gasoline vapors, as that sounds like I could end up winning the Darwin awards, plus, I think it could end up being too much vacuum on the media inside the can.
Is there a tool that would use compressed air source to generate a smaller vaccum? I would think that could be useful, especially if you could use it to suck up old nasty brake fluid in brake and clutch master cylinders prior to changing out fluid.


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