GM GENUINE PARTS Fuel Tank Selector Switch D7003 (15591149) - OE Replacement for Dual-Tank Systems, Direct Fit

The GM Genuine Parts D7003 (15591149) Fuel Tank Selector Switch is the original-equipment switch that lets drivers manually select between two onboard fuel tanks for reliable fuel routing and operation.

Built to the same specifications used by General Motors, this selector switch replaces the factory-installed component on GM vehicles equipped with dual fuel tanks. It interfaces with the vehicle's fuel plumbing and electronics to move the internal valve between tanks, ensuring smooth transitions and preserving the intended performance of the fuel system. As an OE-validated part from GM Genuine Parts, it provides compatibility, fit, and durability expected for service and restoration work.

How does the selector switch work in a dual-tank system?

The switch operates an internal valve assembly that directs fuel flow from one tank to the engine while isolating the other tank. When you toggle the selector, the switch signals the valve mechanism to change position so fuel is drawn from the chosen tank without manual plumbing modifications.

• Simple manual control for switching between primary and secondary tanks
• Directly actuates the valve to route fuel to the engine
• Maintains sealed separation to prevent cross-contamination

Will this part fit my GM vehicle and match the original?

This D7003 (15591149) switch is produced to GM OE specifications and is intended as the recommended replacement for the factory-installed selector used on compatible GM models. Because it’s an OE part, it’s engineered for the same mounting, electrical connections, and mechanical interfaces as the original component.

• Engineered to original equipment dimensions for straightforward installation
• Electrical and mechanical interfaces match factory connectors and fittings
• Backed by GM validation to ensure compatibility with approved applications

What performance and reliability features should I expect?

GM Genuine Parts are designed, engineered, and tested under the same standards applied during vehicle production. This selector switch focuses on long-term reliability, consistent operation, and resistance to fuel-system environments so it continues to perform as intended under normal vehicle usage.

• Manufactured to GM OE spec for fit, form, and function
• Compatibility with vehicle electronics helps preserve system behavior
• Quality control and materials chosen for durability in fuel-system conditions

How do I replace or service the fuel tank selector switch?

Replacement typically involves accessing the selector mounting location, disconnecting the electrical connector and fuel lines as required, and installing the new GM Genuine Parts switch in the original position. Follow vehicle service manual steps for safe fuel-system work and proper torque specifications.

• Match part number D7003 (15591149) to the vehicle’s required service parts list
• Use factory-recommended procedures to disconnect and reconnect fuel lines and wiring
• Inspect seals and fittings during installation and test switching operation after fitment

Who is this for: The GM Genuine Parts D7003 (15591149) Fuel Tank Selector Switch is intended for owners, technicians, and restoration specialists working on GM vehicles equipped with dual fuel tanks who want an OE-validated replacement. It’s ideal when you need a direct-fit, reliable switch that maintains factory functionality and interfaces with the vehicle’s existing fuel plumbing and wiring. Choose this part when you prefer GM-backed quality and compatibility rather than aftermarket alternatives.