. MAINTENANCE SERVICE PROCEDURE CHECKING FOR MISSING FUEL SPRAY PREVENTION CAP, HARDENING OF RUBBER 4 - 89 Fuel spray prevention cap s (1) to (5) are protective parts installed to prevent fire cau sed by fuel leaking and spraying out on to high temperatur e parts of the engine. Check visually that there are no miss ing caps or loose bolts, and feel with your finger to check that the rubber has not replaced. Ask your Koma