Abstract: A liquid fuel operated engine has an integral fuel filter head formed unitarily on a part of the engine, particularly the engine cylinder head. The integral fuel filter head is designed to matingly receive a fuel filter canister or an adapter for enabling a plurality of fuel filter canisters to be attached thereto. In accordance with a preferred embodiment, the adapter is a plate-like structure having a base mounting socket on one side and a pair of filter canister mounting sockets on an opposite side thereof. The integral fuel filter head is, in accordance with the preferred embodiment, situated on the underside of a horizontally projecting flange formed on a side of the cylinder head. The adapter is designed to receive the same type of filter canisters as does the integral filter head.