Dear All,
I hope someone might be able to advise me - I have founf various posts relating to the Evap Emmissions systems on these systems but I don't think these help me - they refer to flooded carbon canisters or faulty purge valves but it seems to me that the blockage is closer to the tank itself...
To describe the symptoms: Every so often there appears to be a build up of pressure in the tank which causes petrol to push out via the fuel filler cap. If I remember to occasionally open the fuel filler to release the pressure I just get a gas release and I can void the fuel flooding out. But if I leave the fuel filler undone with the engine running fuel floods out.
So it seems that something is pumping pressure into the tank (that is why fuel floods out with the filler cap undone).
If I undo the breather pipe (where it goes into the carbon canister in the engine bay) it doesn't seem to make any differentce, the pressure is not released from the petrol tank. So I do not think that it can be the carbon canister or the purge valve.
If I release the pressure in the tank and then pump air into the tank via the breather tube (again, the one in the engine bay that goes into the carbon canister) then I can build up the pressure manually. i.e. it looks like the breather pipe allows air into the tank but not back out again -as though there is a valve that has been put on the wrong way. Is there such a valve on the tank? How do I get to it?
I am at a loss - any helpful suggestions gratefully received - note: I am aware of the carbon canister and the purge valve, the pressure does not appear to be geeting that far
Tx Brightwell