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Mk IV, Superblower, CRS and other Continuation Cars Forum / Fuel system leak
« on: July 05, 2017, 08:45:38 »
Constant
The charcoal canister in question is an EVAP and as you say catches evaporative vapors from the fuel tank.
The "mushrooms" you refer to are the atmospheric vents i.e. they allow air back into the tank (the filler cap should be sealed on an EVAP system) to prevent a vacuum.
There are normally no safety valves between the tank and the EVAP filter. The fuel getting into the filter would have been caused by a combination of you overfilling and the car being parked on the incline. Modern cars have a floating ball type arrangement that prevents overfilling and this from happening.
In all likelihood the majority of the fuel would have evaporated out of the canister overnight and the bucking you experienced was probably fuel starvation, caused by the remaining fuel in the canister sealing off the port and causing a vacuum. Once back on the level it was probably low enough to allow the canister to breathe normally. Any remaining fuel will have evaporated out over the next day or so. If you are concerned, try draining it and blowing air through for a few hours. Of course, the activated charcoal will be totally knackered, however this will be of little consequence unless you are strictly tested for emissions, in this case it would be best to replace the canister
The small connection goes to the tank the large connection to the engine
Rob
The charcoal canister in question is an EVAP and as you say catches evaporative vapors from the fuel tank.
The "mushrooms" you refer to are the atmospheric vents i.e. they allow air back into the tank (the filler cap should be sealed on an EVAP system) to prevent a vacuum.
There are normally no safety valves between the tank and the EVAP filter. The fuel getting into the filter would have been caused by a combination of you overfilling and the car being parked on the incline. Modern cars have a floating ball type arrangement that prevents overfilling and this from happening.
In all likelihood the majority of the fuel would have evaporated out of the canister overnight and the bucking you experienced was probably fuel starvation, caused by the remaining fuel in the canister sealing off the port and causing a vacuum. Once back on the level it was probably low enough to allow the canister to breathe normally. Any remaining fuel will have evaporated out over the next day or so. If you are concerned, try draining it and blowing air through for a few hours. Of course, the activated charcoal will be totally knackered, however this will be of little consequence unless you are strictly tested for emissions, in this case it would be best to replace the canister
The small connection goes to the tank the large connection to the engine
Rob
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