Aluminium Fuel Pump Block off & Gasket. AC127210 AC127210 £7.95 Out of stock. Aluminium stock fuel pump block off. Fuel pump block offs are used to block the hole in the crankcase when the standard fuel pump is removedThis block off has an M12 x 1.5 tapping for use as an extra oil breather attachment if required. Comes with gasket for fitting.