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MSD Atomic Fuel Pump Kit, High Horsepower

Vehicle Specific fits 22 models
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Part# MSD2921
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Premium fuel-injection conversions and accessories

Tested and proven performance

Adding fuel-injection to your classic car just got easier with the Atomic EFI from MSD. The Atomic EFI is the fastest way to quicker starts, smoother idle and immediate throttle response. Available in several configurations as complete kits, each throttle body injection unit is packed with features designed to enhance performance and reliability. An internal fuel rail reduces leaks and provides a sleek appearance. Annular rings improve fuel atomization and ensure the best air/fuel mixture is delivered to each cylinder. The square-bore design features large 1.75" diameter throttle blades that are riding on precision roller bearings for a smooth pedal transition. The self-calibrating throttle position sensor and four 80-lb injectors ensure that fuel is delivered at the correct rate. Wiring is reduced by integrating the ECU and most sensors into the throttle body. The only sensors you’ll need to connect are the O2 and coolant temperature. The compact power module is a simple plug-in device that can control the electric fuel pump and two electric fans. A hand-held programmer provides a hassle-free way to custom-tailor the EFI to your engine and monitors all of the vitals during operation.


  • - Master Kit: Throttle body, power module, wide band O2 sensor, hand-held monitor, fuel pump, filter, brackets, high-pressure hose and clamps. - Standard Kit: Throttle body, power module, wide band O2 sensor, hand-held monitor. - Standard Fuel Pump Kit: Supports 525 HP – fuel pump, filter, 3/8" high-pressure line, brackets and clamps. - High Horsepower Fuel Pump Kit: Supports 525-650 HP – fuel pump, post-filter, 3/8" high-pressure line, brackets and clamps. - Fuel Pump Return Kit: Regulator, 3/8" return line and fittings
  • NOTE: Not CARB Legal.
WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

Vehicle Fitment

Make & Model Year Range Application Details
Buick Grand National 82 (High-Performance Fuel Pump Kit)
Buick Grand National 84-87 (High-Performance Fuel Pump Kit)
Buick Regal 78-87 (High-Performance Fuel Pump Kit)
Buick Riviera 63-76 (High-Performance Fuel Pump Kit)
Buick Skylark 61-72 (High-Performance Fuel Pump Kit)
Buick T-Type 83-87 (High-Performance Fuel Pump Kit)
Cadillac DeVille 67-90 High-Performance Fuel Pump Kit
Cadillac Eldorado 67-90 High-Performance Fuel Pump Kit
Cadillac Fleetwood 67-90 High-Performance Fuel Pump Kit
Chevrolet Chevelle 64-77 (High-Performance Fuel Pump Kit)
Chevrolet Corvair 60-69
Chevrolet Corvair 95 FC 61-65
Chevrolet El Camino 64-88 (High-Performance Fuel Pump Kit)
Chevrolet Malibu 78-83 (High-Performance Fuel Pump Kit)
Chevrolet Monte Carlo 70-88 High-Performance Fuel Pump Kit
Oldsmobile Cutlass 61-77 (High-Performance Fuel Pump Kit)
Pontiac Bonneville 55-77 (High-Performance Fuel Pump Kit)
Pontiac Catalina 55-77 (High-Performance Fuel Pump Kit)
Pontiac Grand Prix 62-77 (High-Performance Fuel Pump Kit)
Pontiac GTO 61-74 (High-Performance Fuel Pump Kit)
Pontiac LeMans 61-74 (High-Performance Fuel Pump Kit)
Pontiac Tempest 61-74 (High-Performance Fuel Pump Kit)
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MSD Atomic Fuel Pump Kit, High Horsepower
MSD MSD Atomic Fuel Pump Kit, High Horsepower