This is the basic pump and filter assemble. The The rough sock filter is at the bottom, the large white canister is the fine filter, and the pump is housed inside of it. So the pump draws in fuel from the sock filter, pressurizes it, discharges the fuel into the fine filter canister, and then the pressurized, filtered fuel is discharged into the white appendage on the bottom tight and out the black corrugated hose on the top to the engine.