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12678993 12678993
12678993 | Genuine GM® HP4 Injection Pump
GM®

12678993 | Genuine GM® HP4 Injection Pump

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  • Product SKU: 12678993
  • Availability: In Stock
Condition New
$775.00 - $775.00
$775.00
$775.00 - $775.00
$775.00
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Product details

DescriptionHP4 Fuel Injection Pump For 2017-2020 GMC Silverado, Sierra, International CV
ConditionNew
BrandGM®
Part Number12678993

Fitment 12678993

Year(s) Vehicle Engine
2017 - 2020 GMC Silverado 2500 HD General Motors (GM) 6.6L
2017 - 2020 GMC Sierra 2500 HD General Motors (GM) 6.6L
2017 - 2020 GMC Sierra 3500 HD General Motors (GM) 6.6L
2017 - 2020 GMC Silverado 3500 HD General Motors (GM) 6.6L
2017 - 2020 GMC Silverado 2500 HD General Motors (GM) 6.0L
2017 - 2020 GMC Sierra 2500 HD General Motors (GM) 6.0L
2017 - 2020 GMC Sierra 3500 HD General Motors (GM) 6.0L
2017 - 2020 GMC Silverado 3500 HD General Motors (GM) 6.0L
2019 - 2020 GMC Silverado 4500 HD General Motors (GM) 6.6L
2019 - 2020 GMC Silverado 5500D General Motors (GM) 6.6L
2019 - 2020 GMC Silverado 6500 HD General Motors (GM) 6.6L
2019 - 2020 International CV Navistar-International 6.6L


Fuel Injection Pump 12678993 is a crucial component in many diesel engines (and some older gasoline engines). It’s responsible for delivering the right amount of fuel, at the right pressure, and at the right time to each cylinder for efficient combustion.

 

  • Fuel Delivery: Low-pressure fuel from the tank enters the injection pump.

  • Pressurization: The pump uses internal plungers or pistons to build pressure (often 15,000–30,000 psi or more).

  • Timing Control: The pump sends fuel to each injector in sync with the engine’s camshaft position.

  • Injection: Fuel is injected directly into the combustion chamber at the perfect moment for ignition.

Signs of Faulty 12678993

 

  • Hard starting or no start condition.

  • Rough idle or engine misfires.

  • Loss of power, especially under load.

  • Excessive smoke (white, black, or blue).

  • Poor fuel economy.

  • Fuel leaks or strong diesel smell.

  • Check Engine Light (on electronically controlled systems).
About the manufacturer

GM (General Motors) is an American multinational automotive company headquartered in Detroit, Michigan, founded in 1908. It designs, manufactures, and sells vehicles and parts under brands such as Chevrolet, GMC, Cadillac, and Buick. GM is known for innovation in automotive technology, including electric vehicles, safety systems, and advanced manufacturing. The company also produces genuine OEM parts—like the GM Genuine Parts line—to ensure high-quality fit, performance, and reliability for its vehicles.

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