Fuel tank cap, plastic 333/C0880 JCB, genuine

For the JCB machines: fuel tank cap, plastic 333/C0880, a genuine JCB part. According to the product card, the cap is plastic; the card also lists 332/F4780.

The fuel tank cap closes the filler neck, stopping fuel splashing out and dust, water and foreign objects getting into the tank. Many caps contain a vent valve that lets air into the tank as fuel is used but keeps dust and water out. A cap with a blocked vent creates a vacuum in the tank, strains the lift pump and makes the engine lose power. Locking caps protect against fuel theft. A hardened seal or a lost cap lets dirt into the tank, which is a serious threat to the injection pump and injectors. If the cap is lost, the filler neck is never left open even briefly; it is covered with a clean blank until a proper cap is fitted. Rain and dust entering an open neck can block the fuel filters within hours and damage the injection system. If the cap has a chain or tether, check that it is intact too. Along with the cap, check the filler neck threads or bayonet lugs.

Specifications

Compatibility

According to the product card, 333/C0880 is a fuel tank cap. The card also lists 332/F4780. Fit is confirmed by the part number. The catalogue also has the aftermarket version of this part. Other parts are in Fuel tanks.

Fitting

When fitting the cap, clean the neck face and seal; tighten a threaded cap by hand until the seal seats evenly, or turn a bayonet cap until it locks. On a locking cap, check that the key works easily. After fitting, confirm that the cap does not leak and the vent is open. Check the cap at every refuelling, and replace one with an aged seal or a stiff lock without delay.