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GRANATELLI HIGH-PERFORMANCE FUEL SYSTEMS
BUILD A CLEANER, MORE COMPACT TWIN-PUMP FUEL SYSTEM.
The Granatelli Motor Sports GM821B Billet Twin Fuel Pump Manifold & Bracket Kit provides a professional solution for mounting two compatible external fuel pumps into one organized assembly.
Featuring billet aluminum construction, integrated inlet and outlet manifolds, and multiple ORB-style ports, the GM821B helps simplify fuel-line routing while providing a clean, compact foundation for high-performance EFI, turbocharged, supercharged and racing fuel systems.
TWIN PUMP EXTERNAL PUMP LAYOUT | BILLET ALUMINUM CONSTRUCTION | HIGH-FLOW -10AN IN / -8AN OUT |
FUEL SYSTEM PACKAGING THAT MATTERS
Why Use a Dedicated Twin-Pump Manifold & Bracket?
High-output EFI and forced-induction engines can demand significantly more fuel volume than a single external pump can provide. The GM821B consolidates two compatible external fuel pumps into one compact mounting and manifold assembly, helping simplify fuel plumbing and eliminate the need for separate pump clamps and distribution blocks.
Build Your Twin-Pump System in Three Steps
01 Mount Two PumpsSecure two compatible external fuel pumps to the billet twin-pump bracket. | 02 Connect the ManifoldsConfigure the integrated inlet and outlet manifold ports around your fuel-system plumbing requirements. | 03 Route the Fuel LinesConnect the appropriate fuel lines and fittings while verifying pump compatibility and system requirements. |
Built for Serious High-Performance Fuel Systems
● Turbocharged Vehicles ● Supercharged Vehicles ● High-Horsepower EFI ● Drag Racing ● Street/Strip Builds ● Muscle Cars ● Restomods ● Hot Rods
Designed for Custom High-Flow Fuel Systems
| ✓ Dual External Fuel Pump Mounting Designed to mount two compatible external fuel pumps in one compact and organized assembly. | ✓ Integrated Manifolds Combines pump mounting with integrated inlet and outlet manifolds to simplify fuel-system plumbing. |
| ✓ Flexible Plumbing Options Multiple ORB-style ports allow builders to configure fuel lines around their specific installation. | ✓ Compact Packaging Keeps pumps, mounting hardware and manifold plumbing together instead of spreading components throughout the vehicle. |
Why Choose the Granatelli GM821B?
| ✓ Billet Aluminum Construction Provides a strong, durable foundation with the premium appearance expected in high-end performance builds. | ✓ High-Flow Manifold Layout Features a -10AN inlet and -8AN outlet configuration for high-performance fuel-system applications. |
| ✓ Cleaner Installation Replaces improvised pump clamps, separate distribution blocks and pieced-together mounting solutions with one organized assembly. | ✓ Universal Performance Application Ideal for EFI, forced-induction, racing, street/strip, muscle car, restomod and custom fuel-system installations. |
FUEL SYSTEM DETAILS
Product Specifications
| Part Number | GM821B |
| Product Type | Twin Fuel Pump Manifold & Bracket Kit |
| Fuel Pump Capacity | 2 External Fuel Pumps |
| Fuel Pumps Included | No – Bracket / Manifold Kit Only |
| Manifold Inlet | -10AN |
| Manifold Outlet | -8AN |
| Manifold Port Style | ORB-Style Ports |
| Material | Billet Aluminum |
| Finish | Black |
| Application | Universal High-Performance Fuel Systems |
| Country of Origin | Made in USA |
| Warranty | 90-Day Warranty |
IMPORTANT FUEL SYSTEM NOTE
Fuel pumps are NOT included with the GM821B. This listing is for the billet twin-pump manifold and bracket assembly only. Always verify fuel pump dimensions, port configuration, fuel compatibility, operating pressure, fittings and overall fuel-system capacity before installation.
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⚠️ WARNING (California Proposition 65):This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.For more information, please visit www.P65Warnings.ca.gov.
