is the fuel tank Toyota corolla 1985 AE82R vented or not


Asked by Nov 01, 2015 at 01:44 AM about the 1985 Toyota Corolla

Question type: Maintenance & Repair

My model does not have a charcoal canister. South Africa model. There is a large pressure escape when opening the filler cap. The cap is a solid bayonet type.The problem is that on  manily very hot days there is a irregular engine hiccup/splutter, which  I suspect to be as a cause of the pressure build up in the tank. Why does the filler neck have a bypass port, which seems to go back into the tank. The diagrams I am able to get from the internet are not very revealing.

4 Answers


Here in the U.S. in the days before EVAP systems (charcoal canisters) were required gas tanks had either a vent tube or vented gas cap. The vent tube was usually on the front of the tank with a rubber hose that directed the gasoline vapors away from the passenger's compartment and the hot exhaust system. They can sometimes get clogged with dirt from the road. HTH. -Jim

2 out of 2 people think this is helpful.

thanks JIm. I have been told once that the tank is to be pressurised but don't quite understand what for. It has a mechanical fuel pump. I am no car guru but just trying to apply my common sense. The part blow-ups are not very clear or helpful either. My mom bought the car in 1985 so its been in in one hand.

2 out of 2 people think this is helpful.

You're welcome. Glad to help. To test your theory you can try driving with the gas cap removed. For a short time only. If the sputtering goes away then it's definitely gas tank related. You may also have a fuel return line. This is a fuel line that returns some gasoline to the tank to keep the gas cool in hot weather conditions. It helps prevent vapor lock. HTH. -Jim

2 out of 2 people think this is helpful.

It does have a return system, The first Toyota to have a returnless system was 1996

5 out of 5 people think this is helpful.

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