Warning Signs that Indicate the Fuel Pump Housing is Faulty in Your GMC Duramax

Bryan Warman • August 17, 2021

The Duramax V8 engine is produced by DMAX , a joint venture between General Motors and Isuzu in Moraine, Ohio . Unlike the regular diesel engine , the engine features an injection pump that sucks fuel from the tank, creating a vacuum from the fuel tank through the fuel lines and fuel filter . However, just like a regular lift pump, the injection pump fails at times. The CP4 pump in the 2011-2016 generation was even notoriously known for its catastrophic failures.

The GMC Duramax is a turbo-diesel engine produced by General Motors for pickup trucks , SUVs , and vans . The engine was launched in 2001 with the LB7 , which featured a 6.6L V-8 . This engine was used in the Chevy Silverado HD , GMC Sierra HD , Chevy Kodiak , and GMC TopKick models manufactured from 2001 to 2004.

Duramax Injection Fuel Pump

Varying from most conventional diesel engines, the Duramax system doesn’t feature a lift pump . Rather, the injection pump sucks fuel from the tank, creating a vacuum from the fuel tank through the fuel lines and fuel filter. Once the fuel reaches the injection pump, it is pressurized to the high pressures needed for the fuel injectors.

Over the years, the company had released multiple generations of the engine. In 2017, the company released the most recent generation, the L5P Duramax engine . It is the most powerful diesel pickup truck engine GM has produced. Duramax engines range from four , six , and eight cylinders in either inline or V configurations .

Although the Duramax engine has had massive success since its inception, the 2011-2016 edition brought about controversy. This edition, which was fitted with the CP4 pump, suffered from high-pressure fuel pump complications . The failure of this pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates.

Signs of a Defective Injection Pump

The Bosch CP4 high-pressure injection pump was, no doubt, famous because of its high pressure fuel pump complications. The pumps fitted in older generations before the CP4 pump and subsequent generations after it worked just fine. However, with tear and wear, these pumps might begin to deteriorate. Discussed below are the following signs to look out for to tell whether your GMC Duramax injector pump is defective.

  • Difficulty accelerating : The engine requires fuel to function optimally. If the injector pump doesn’t supply the engine with adequate fuel, your truck might have trouble accelerating . When your truck has difficulty accelerating, it is an indication that your fuel pump needs a checkup.
  • Reduced fuel efficiency: Another indication of a defective fuel pump is a reduction in fuel efficiency. A defective fuel injection pump in your truck can result in fuel wastage through leakages or supply of excessive fuel to the engine.
  • Excessive smoke: Although the emission of excessive smoke ( black , white , or blue ) from your truck may be attributed to other factors, there is a high tendency that your fuel pump is responsible.
  • Power loss: When debris , rust , and dirt make their way into your truck’s fuel system, this system becomes clogged . This could cause an unsteady supply of fuel to the engine, which may result in a sudden loss of engine power .
  • Rough idle: A clogged up fuel system struggles to supply fuel to the engine. The effect is that instead of a smooth engine idle , it will be rough and irregular since the fuel supply is epileptic.
  • No-start condition: Gradually, the clog in your fuel system may result in total blockage. The total blockage will prevent you from getting fuel into the combustion chamber , and your truck won’t start.

Diesel Pickup Pros to the Rescue

If you notice one or more of the signs discussed above, it is a warning of a bad or failing injection pump. You don’t want to get stranded in the middle of nowhere. Visit Diesel Pickup Pros today for your GMC Duramax service and repair. When it comes to the maintenance of these engines, they need specialized tools , equipment , and experienced mechanics.

At Diesel Pickup Pros , we pride ourselves on being the one-stop-shop for all your diesel truck services and repairs. Our shop is equipped with the same factory-grade tools and equipment as the dealerships . This ensures the highest quality services and repairs backed by our 24-month/24,000-mile warranty on all parts and labor.

Our expert mechanics help diesel truck owners throughout Floyds Knobs , Georgetown , Jeffersonville , New Albany , in Louisville, KY . We handle every service your truck needs. Bring your truck in for a checkup today!

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