Mopar 52030377AB Fuel Cap – OEM Diesel Fuel Tank Cap for Dodge Ram
Mopar 52030377AB Fuel Cap – OEM Diesel Fuel Tank Cap for Dodge Ram
Replace your old or missing diesel fuel cap with the Mopar 52030377AB – a genuine OEM replacement designed to provide a secure seal, prevent fuel evaporation, and maintain proper fuel system pressure.
Key Features:
- Genuine Mopar OEM diesel fuel cap
- Built to factory specifications for a perfect fit
- Helps maintain fuel system integrity and emissions control
- Durable construction with tether strap included
- Seals tightly to prevent leaks and fuel odor
Vehicle Compatibility:
Fits select Dodge Ram models with diesel engines:
- Dodge Ram 2500 / 3500 (1998–2002) – 5.9L Cummins Diesel
- Also fits other models using threaded diesel fuel filler necks (verify fitment)
🔍 Check your vehicle’s VIN or existing cap part number to ensure correct fit.
Cross Reference Part Numbers:
- Mopar: 52030377AB
- Replaces: 52030377AA
- May be interchangeable with aftermarket equivalents, but this is the OEM part
What’s Included:
- 1x Mopar 52030377AB Diesel Fuel Cap with tether (OEM packaging)
Ships Fast Across the USA
All orders ship within 1–2 business days. Tracking provided.
Get the Mopar quality your Ram truck deserves.
OEM fit. Sealed protection. No warning lights.
❓ FAQ
Q: Which specific Ram trucks and engine platforms is this fuel cap compatible with? A: The Mopar 52030377AB is engineered specifically for second-generation heavy-duty trucks, covering the 1998 to 2002 Dodge Ram 2500 and 3500 equipped with the 5.9L Cummins 24-valve (24V) turbo diesel engine. It is a threaded cap designed to fit securely into the factory metal fuel filler neck layout typical of this production era.
Q: Can this diesel fuel cap be safely used on newer Ram trucks or gasoline engines? A: No, it should not be mixed across different generations or fuel types. Newer Ram trucks (specifically 2013 and fresher models) utilize a modern, capless fuel filler neck system or an entirely different diameter cap setup altogether. Furthermore, diesel caps are calibrated with unique internal pressure and venting parameters designed specifically to handle diesel fuel vapor expansion—using it on a gasoline vehicle or an incorrect model year can trigger immediate EVAP diagnostic codes and warning lights on your dashboard.
Q: What are the exact step-by-step instructions for installing this new cap and its attached tether? A: Replacing your fuel cap is a fast, tool-free job that helps prevent fuel contamination and vapor leaks. Follow these quick steps to secure it properly:
Open your truck's fuel filler door. If your old cap is still present, look at the plastic tether strap pin attached to the hinge or body structure. Gently pry or unclip the old plastic pin attachment out of its mounting hole to release the old tether, then unscrew and remove the old cap.
Before installing the new component, take a clean, lint-free cloth and wipe down the inner metal threads and the flat outer sealing lip of the fuel filler neck. Removing accumulated road dust, grit, or dried fuel residue ensures a completely airtight seal for the new rubber gasket.
Take the plastic anchor pin attached to the new Mopar 52030377AB cap tether and press it firmly into the factory mounting hole on the fuel door assembly or inner body panel until it snaps or locks completely into place.
Insert the new green diesel cap into the filler neck. Spin it clockwise by hand until you feel the threads engage smoothly. Continue turning it until it seats fully flat and clicks or stops firmly—confirming that the internal rubber gasket is fully compressed against the sealing rim to prevent fuel contamination, evaporation, or odors.