Fitting a Walbro 255 in tank pump

[Poodle]

A bin bag or other sheet of plastic spread around the hole means you can be a bit less careful with the fuel. In the top of the plastic cap there is a slot, inserting the the screwdriver and pulling away from the centre of the cap will release it without mullering the edges of the cap or the hole in the floor (learnt the hard way lol).