Gates 31803 Fuel Tank Cap

Gates 31803 Saddle Tank Fuel Cap

The Gates 31803 saddle tank fuel cap is built with solid brass construction and a heavy metal design throughout for dependable service on fuel tank applications. It is a vented, female-thread cap with an 8.25-inch chain and fuse plug, made to meet I.C.C. requirements.

For buyers searching for a replacement saddle tank fuel cap for truck and commercial fuel systems, this Gates fuel tank cap offers the correct thread specification and a direct hardware-style replacement format. It is a practical choice for maintaining secure tank closure on compatible saddle tank setups.

Key Features

• Solid brass construction for durable fuel system service
• Vented design for proper tank breathing
• Female thread cam type
• 2" x 11.5 NPSM thread size
• 8.25-inch chain length
• Cross bar length: 3.52 inches
• Shell diameter: 2.77 inches
• Includes fuse plug
• Meets I.C.C. requirements
• Gates 31803 part number for direct reference

Product Details

The Gates Saddle Tank Fuel Cap line is focused on fuel tank hardware for commercial and heavy-duty applications where correct thread fit, venting, and durable metal construction matter. Part number 31803 uses a 2" x 11.5 NPSM female-thread design and a vented configuration to support proper tank operation. If you are replacing a worn or missing cap on a saddle tank fuel system, Gates 31803 provides a straightforward replacement option with the dimensions and construction details buyers look for.

This part cross-references Four Seasons 46149 for the same application. It is also commonly searched as Gates 31803 fuel tank cap, saddle tank fuel cap, and vented brass fuel cap for truck fuel systems.

Common Issues This Cap Can Address

• Missing or damaged saddle tank fuel cap
• Fuel tank closure problems caused by worn threads
• Improper tank venting from a failed cap
• Fuel system contamination from an unsecured opening
• Replacement needs for commercial truck fuel tank hardware

Installation Notes and Tips

Verify the tank opening thread size before ordering. This cap uses a 2" x 11.5 NPSM female thread, so matching the tank neck specification is essential for proper installation. Confirm the cap style, venting requirement, and chain length against the original hardware before use. For vehicle-specific searches, buyers often look for Gates 31803 on truck and commercial applications such as Ford F-350 and Chevrolet C/K fuel tank setups, but final selection should always be based on the tank thread and cap style.

Quality Assurance

Gates manufactures this cap with heavy metal construction and solid brass material, and the part is stated to meet I.C.C. requirements. That combination makes the Gates 31803 a specification-driven replacement for fuel tank service where durability and correct fit are priorities.