Isuzu Elf NPR/NKR 600P 100P Fuel Tank Cap

🔩 What the Fuel Tank Cap Is & What It DoesA fuel tank cap (a.k.a. fuel filler cap, gas cap, or fuel filler cover) is a small but important part of a vehicle’s fuel system. On Isuzu light-duty trucks like the ELF, NPR, NKR, 600P, and 100P, this cap:Seals the fuel tank opening to prevent fuel vapors from escaping and contaminants (dust, water, dirt) from entering the tank. Isuzu Truck SparesHelps maintain proper fuel system pressure so that fuel delivery and engine performance remain consistent.Provides anti-theft protection when equipped with a locking key (many OEM caps have keys).It’s located at the fuel filler neck (where you insert the fuel pump nozzle) and is usually accessed from the exterior body side of the truck. Isuzu Services🧰 Typical Design & ConstructionFuel tank caps for these Isuzu models usually share these design traits:Material: Durable plastic body (sometimes with metal components), resistant to fuel, heat, and vibration. Shape: Circular or near-circular cap that screws onto the filler neck using threaded or twist-lock action. Isuzu Truck SparesSeal: A rubber gasket or O-ring on the underside ensures a tight seal against leaks and vapor escape. Locking Mechanism: Many OEM caps include a key lock to secure the tank and prevent unauthorized opening. Color: Most aftermarket/OEM caps are black, but some genuine Isuzu caps may vary. HSome caps are vented (allowing controlled air passage to balance pressure), while others are simple sealed units depending on tank design and emissions requirements.🧷 OEM Part Numbers & FitmentDifferent Isuzu part numbers correspond to slightly different caps and features. Common examples include:8-94160028-0 / 8941600280 – Standard fuel filler cap for 600P/100P and other ELF/NKR models. HINO ISUZU FUSO UD 8-94160028-1 / 8941600281 – Cap often used on NHR/NKR/NPR 100P. 8-94258610-2 – Often seen paired with 8-94160028-0 as a kit that includes a key lock.8-97994821-1 / 8979948211 – OEM cap with key for some 100P variants. Isuzu Auto Parts SupplyThese caps are designed to fit specific tank neck geometries and thread pitches, so using the correct one ensures a proper fit and seal.📌 How It Works (User Perspective)When refueling:You unlock and remove the cap (if keyed).Unscrew or twist the cap counter-clockwise to open.Insert the fuel nozzle and refuel.Replace the cap by turning it clockwise until it’s snug.Lock the cap (if it has a key) to secure it. Isuzu ServicesKeeping the cap properly closed is essential — if not sealed correctly, it can cause fuel leakage, valve issues, or even trigger a malfunction indicator light on modern trucks.