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GRANATELLI HIGH-PERFORMANCE FUEL SYSTEMS
DOUBLE THE PUMPS. CLEANER INSTALLATION. BUILT FOR PERFORMANCE.
The Granatelli Motor Sports GM821B Billet Dual Fuel Pump Manifold & Bracket Kit is engineered to securely mount and connect two standard-size external electric fuel pumps in a compact, professionally organized assembly. Designed for regular-size Bosch 044-style fuel pumps with M18 x 1.5 female inlet connections, this kit provides a practical solution for building high-performance dual-pump fuel systems.
Featuring precision-machined billet aluminum construction, a black finish, and an integrated fuel manifold design, the GM821B helps simplify fuel-system plumbing while providing secure pump positioning for street performance, high-horsepower EFI, turbocharged, supercharged, and racing applications.
IMPORTANT: STANDARD-SIZE FUEL PUMP FITMENT
The GM821B is designed for two regular-size, Bosch 044-style external fuel pumps with compatible M18 x 1.5 female inlet connections. This is a dual-pump bracket and manifold assembly. Fuel pumps are NOT included. Always verify pump dimensions and connection compatibility before ordering.
Key Features & Benefits
- Standard-Size Fuel Pump Compatibility: Designed for two compatible regular-size Bosch 044-style external electric fuel pumps.
- Dual Fuel Pump Configuration: Supports mounting two pumps together in a compact parallel arrangement.
- Billet Aluminum Construction: Durable, precision-machined aluminum construction with a clean black finish.
- Integrated Fuel Manifold Design: Helps consolidate fuel-system connections for a cleaner, more organized installation.
- High-Flow Plumbing Layout: Designed with -10AN inlet and -8AN outlet manifold connections.
- Compact Mounting Solution: Helps reduce clutter associated with separately mounted pumps and individual plumbing components.
- Performance Applications: Suitable for compatible EFI, carbureted, forced-induction, street/strip, and custom racing fuel systems.
- Universal Custom Installation: Designed for custom fuel-system builds rather than a specific vehicle make or model.
Designed for Regular-Size External Fuel Pumps
The GM821B is intended for standard-size external fuel pumps commonly referred to as Bosch 044-style pumps. These pumps are widely used in performance fuel-system applications where reliable mounting and organized fuel plumbing are important.
The bracket and manifold assembly is designed for compatible pumps using M18 x 1.5 female inlet connections. Because external fuel pumps are available in different body sizes and connection configurations, pump compatibility must be verified before installation.
Important: This kit is not advertised as a universal fit for every external fuel pump or oversized pump configuration.
Why Choose a Dual Fuel Pump Manifold & Bracket?
High-performance engines can require fuel delivery beyond the capacity of a single pump. A properly engineered dual-pump fuel system allows builders to configure two compatible external fuel pumps in parallel to support their intended fuel-delivery requirements.
The Granatelli GM821B helps organize this setup by providing a compact mounting and manifold assembly. This reduces the need for improvised mounting solutions and helps create a clean, serviceable installation.
Popular Applications
- High-performance EFI fuel systems
- Turbocharged and supercharged applications
- High-horsepower street and strip vehicles
- Drag racing and motorsports builds
- Performance muscle cars and restomods
- Custom fuel-system installations
- Compatible dual external fuel pump conversions
Product Specifications
| Part Number | GM821B |
| Brand | Granatelli Motor Sports |
| Product Type | Dual Fuel Pump Manifold & Bracket Kit |
| Pump Size | Regular / Standard Size |
| Pump Compatibility | Compatible Bosch 044-Style External Pumps |
| Compatible Pump Inlet | M18 x 1.5 Female |
| Fuel Pump Capacity | 2 External Electric Fuel Pumps |
| Manifold Inlet | -10AN |
| Manifold Outlet | -8AN |
| Construction | Billet Aluminum |
| Finish | Black |
| Fuel Pumps Included | No |
| Application | Universal Custom Performance Fuel Systems |
| Country of Origin | Made in USA |
| Warranty | 90 Days |
Important Installation & Fitment Information
FUEL PUMPS ARE NOT INCLUDED. This product is sold as a dual fuel pump manifold and mounting bracket kit only.
Designed for compatible standard-size, Bosch 044-style external electric fuel pumps. Verify pump body dimensions, M18 x 1.5 inlet connections, fittings, fuel compatibility, operating pressure, and complete fuel-system requirements before purchasing or installing. Professional installation is recommended.
Shipping & Delivery Information
Our Shipping Promise
At Slickpurchase, we understand how important your purchases are. That's why we take extra care with every package we send. All orders are shipped in double-boxes with full insurance for additional protection, ensuring your items arrive safely.
Processing & Shipping Timeline
- Processing Time: Orders are processed within 3-6 business days
- Domestic Delivery: Typically 6-10 business days
Please note that delivery times are estimates and may vary based on your location, weather conditions, or other unforeseen circumstances.
Shipping Destinations
Slickpurchase currently only ships to the United States.
Shipping Costs
We are pleased to offer free standard shipping on all orders within the United States.
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We respect your privacy. All Slickpurchase packages are shipped with complete discreet packaging. The product name, description, sender's name, and any information that hints about the contents are encrypted. Your package will arrive without any indication of what's inside, ensuring your purchase remains confidential.
Signature Requirements
Important Note: All orders valued above $250 will require a signature upon delivery for your protection.
Order Tracking
Once your order ships, you'll receive a tracking number via email so you can monitor your shipment's progress every step of the way.
Lost or Delayed Shipments
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For your protection, we may contact you for additional order verification of the payment method on certain orders.
Questions or Concerns?
For details on returns and refunds, please refer to our Return Policy page.
For any questions about shipping or delivery, please contact our customer service team at support@slickpurchase.com.
⚠️ 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.
