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Very easy diy job if you buy a good 2nd hand unit with everything attached as it came out of the car. Its fairly straight forward just replacing the pump which is enclosed in its own plastic canister type resorvoir. I took mine to bits on the coffee table without any instructions...and put it back together!!
One thing that can happen is the o ring seal in the top cover sometimes expands and when you put it back it doesn't form a tight seal and when the petrol tank is full it leaks out a little bit and the fumes get into the cabin. A saab specialist told me to cut about 10mm out of the o ring and superglue back together if I had this problem...which I now have but haven't got round to fixing it!
One thing that can happen is the o ring seal in the top cover sometimes expands and when you put it back it doesn't form a tight seal and when the petrol tank is full it leaks out a little bit and the fumes get into the cabin. A saab specialist told me to cut about 10mm out of the o ring and superglue back together if I had this problem...which I now have but haven't got round to fixing it!
