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The mkiv Supra Owners Club

Fuel tank breather


Johnm400

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I still have a problem with the smell of petrol around the rear drivers side near the fuel cap area. If i open the fuel filler flap after driving, it stinks in that area. Ive checked for leaks around all the pipes under the car and replaced the fuel cap with no joy.

 

Im almost certain it must be the fuel tank breather pipe that is corroded along the steel section or perished along the rubber end sections. Is it possible to get to and remove the breather hose that runs across the top of the fuel tank and up to the fuel filler neck without removing the tank and if so, how?

 

If not, what is involved in removing the tank and how long does it normally take?

 

Thanks.

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Dropping the tank is very easy, fuel tank cover off, then literally 4 bolts.

 

Does your car still have the carbon canister and vac feed to the manifold?

 

Im not with the car at the minute but i dont think it does have a carbon canister although i could be wrong, ive never really taken much notice to that tbh, ill have to double check later. Why, whats the score if it does?

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Before you drop the tank cover and tank I'd recommend take the top cover off located under the space saver wheel, its easier. Then you can see if there are any leaks from the rubber pipes that run into the fuel delivery and return metal lines from the top of the tank. You will also be able to see how clean it is up there. I could have planted an entire forest with all the fine soil on the top of my tank and that had led to the breather pipe that runs from the tank to its outlet at the filler being buried and corroding away. So, if you find a lot of fine soil in there then your breather pipe could well have rusted away which could lead to fuel spillage if you have a habit of to the neck filling of your tank.

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  • 2 weeks later...
Before you drop the tank cover and tank I'd recommend take the top cover off located under the space saver wheel, its easier. Then you can see if there are any leaks from the rubber pipes that run into the fuel delivery and return metal lines from the top of the tank. You will also be able to see how clean it is up there. I could have planted an entire forest with all the fine soil on the top of my tank and that had led to the breather pipe that runs from the tank to its outlet at the filler being buried and corroding away. So, if you find a lot of fine soil in there then your breather pipe could well have rusted away which could lead to fuel spillage if you have a habit of to the neck filling of your tank.

 

Hi, thanks for that. Ill have a look there and hopefully i will be able to see the problem before dropping the tank.

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Well i removed the inspection cover in the boot and all looked ok in there. None of the pipes looked to be perished or leaking around the fuel pump area and there was some dirt on the top of the tank but nothing major. It looks like im left with no option but to drop the tank so i can inspect the filler neck area.

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