Fuel tank
Stores the fuel carried by a combustion car.
Under the rear body or passenger-floor area; layout varies.
Venting, pump modules and level sensing manage storage and delivery without treating the tank as a sealed can.
A protected reservoir feeding a small factory.
Fuel odor, leakage or inaccurate level readings need a careful inspection.
Plugs and filters use engine-specific service guidance. Pumps and injectors are normally assessed through pressure, leakage and electrical tests.
Spark-plug service is usually less involved than direct-injector or high-pressure-pump replacement; coding and access can add work.
BMW plug-in hybrids have both a fuel tank and a traction battery, packaged for the specific chassis.
BMW combustion models; spark components are petrol-only and glow-plug hardware is diesel-only.