How to Change The Fuel Filter In A Mini Cooper
The fuel filter is located in the right hand side fuel sending unit which is under the rear seat. In my photo there are items not to be found on a “stock” MINI. Remove the nuts with a 10mm; pry the lid up exposing the sending unit cap, brush and vacuum the SU cap till clean.
Wear chemical resistant gloves during the next steps and place a chemical resistant covering over the rear floor area and side trim. Cover the fuel line connector in rags, press the side tabs in and pull the line free. The fuel is under pressure in this step so take precautions to avoid overspray.
Lift the unit about 4 inches, grab the top and sides and twist to unlock, pull the cap off. This will require effort and perseverance to separate. The filter is now exposed; pull the filter from the sending unit. The filter will be blackened and soil everything it touches so change gloves after handling the filter. There will be brackish fuel in the sending unit to be siphoned off so the small O-ring can be removed and replaced.
Smear a small amount of Vaseline on the O-rings and sending unit gasket seal, put the gasket seal on the cap with the words “this side down” showing. Pull the sending unit up, press the new filter over the lower O-ring & post and press the two sending unit halves together, twist to lock. Slide the gasket seal down and press it into place with the fingers, working from one side to the other until it is flush.
Position the sending unit in the tank with the lid tab indexing the tank collar slot, screw on the locking ring, and tap with screw driver and hammer to tighten, push in the fuel line until the green locking tabs snap in place, re-fasten tank access cover.