Spectra GM4B Fuel Tank

Spectra GM4B Fuel Tank for GM B-Body Applications

The Spectra GM4B fuel tank is an OE-style replacement built for select Chevrolet, Cadillac, and Pontiac full-size rear-wheel-drive applications. It is engineered with manufacturing controls and quality checks to match or exceed the performance of the original tank it replaces.

• OE replacement fuel tank for select GM B-body vehicles
• Built to Spectra Premium engineering and quality control standards
• Lock ring kit included
• Direct-fit replacement for applications without a filler neck
• Part number: GM4B

Vehicle Fitment

• Fits 1985-1989 Chevrolet Caprice, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1985-1986 Pontiac Parisienne, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1981-1985 Cadillac Fleetwood, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1977-1979 Cadillac Fleetwood, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1985 Chevrolet Impala, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1983-1984 Cadillac Commercial Chassis, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1977-1978 Cadillac Commercial Chassis, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1981-1984 Cadillac DeVille, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck
• Fits 1977-1979 Cadillac DeVille, N/A; 39-3/4 in. x 26-1/2 in. x 10 in.; Lock Ring Kit Included; w/o Filler Neck

What This Fuel Tank Helps Address

• Fuel tank corrosion on aging Chevrolet Caprice, Cadillac DeVille, and Cadillac Fleetwood models
• Leaks caused by rust, pinholes, or damaged tank seams
• Fuel delivery issues related to a compromised tank assembly
• Fitment problems when replacing an original tank with the wrong dimensions
• Service needs on vehicles that use a tank without a filler neck

Installation Notes

Verify tank dimensions and application details before installation. This GM4B fuel tank is specified for vehicles without a filler neck and uses a lock ring style connection. Confirm the vehicle’s original configuration, sender setup, and mounting points against the listed fitment before beginning service.

This part cross-references FLGM4B and RGM4B for the same application.

Quality Assurance

Spectra Premium fuel tanks are manufactured with engineering, production, and inspection processes intended to meet or exceed the performance of the original equipment tank they replace. The GM4B is built for consistent fit and dependable service on select Chevrolet Caprice, Cadillac Fleetwood, Cadillac DeVille, and Pontiac Parisienne applications.