Evening ladies and gents,my petrol tap is leaking and so,I shall be attempting to fit a new cork seal.After a brief recce' I need to ask your advice on the following.If I drive the front of the car onto my ramps, will this stop the tank from emptying itself when I dismantle the tap, and save trying to block the flow some other way? Is there a trick to undoing the small grub screw on the side of the tap as the gap looks very small to get a screwdriver in. Has anybody simply replaced the tap with