Fuel tank expansion noise
Discussion
Yes I get the boom too, normally just after starting the car and reversing. Last time the poor tyre fitter when moving the car thought he had backed into something, the look of suprise on his face made me chukkle. Got used to it now, but new passengers ask whats happened. Have to live with it just like the tikking spedo.
jack
jack
Its because your carbon cannister is not working as well as it should. Basically there is a fuel tank vent that vents to atmosphere at the front of the car, but the fumes go through a carbon cannister first which is located in the front wing.
If the cannister is not venting (ie blocked), as the fuel tank empties you get a partial vacuum forming in the tank. The clanking noise is the tank collapsing on itself a bit, not expanding. This is a common "characteristic" on older cars.
Cheers,
Matt.
PS, you don't have to live with it, you can replace the cannister.
>> Edited by M@H on Monday 15th November 15:22
If the cannister is not venting (ie blocked), as the fuel tank empties you get a partial vacuum forming in the tank. The clanking noise is the tank collapsing on itself a bit, not expanding. This is a common "characteristic" on older cars.
Cheers,
Matt.
PS, you don't have to live with it, you can replace the cannister.
>> Edited by M@H on Monday 15th November 15:22
M@H said:
Its because your carbon cannister is not working as well as it should. Basically there is a fuel tank vent that vents to atmosphere at the front of the car, but the fumes go through a carbon cannister first which is located in the front wing.
If the cannister is not venting (ie blocked), as the fuel tank empties you get a partial vacuum forming in the tank. The clanking noise is the tank collapsing on itself a bit, not expanding. This is a common "characteristic" on older cars.
Cheers,
Matt.
PS, you don't have to live with it, you can replace the cannister.
>> Edited by M@H on Monday 15th November 15:22
spot on. take out the cannister, give it a thump and bingo.
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