A distributor arrangement is disclosed which comprises a distributor member (18) rotatable within a bore formed in a sleeve (14), the sleeve (14) being provided with a supply port (22) through which fuel under high pressure can be supplied to the distributor member (18), in use, and a plurality of delivery ports (26), the distributor member (18) being provided with a delivery passage (32) registrable with the delivery ports (26), in turn, upon rotation of the distributor member (18) whereby fuel under pressure supplied through the supply port (22) flows to a selected one of the delivery ports (26), in use, the distributor arrangement further comprising a porting arrangement whereby, when the distributor member (18) occupies a position in which the delivery passage is not registered with any of the delivery ports (26), cooling fluid is able to flow through the delivery passage (32).