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June 10, 2025

Is Your MaxxForce Engine Losing Power? Understanding and Fixing Low Fuel Pressure

Educational
Jennie Matthews
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Is your International MaxxForce engine not performing like it used to? Are you experiencing symptoms like low power, stumbling, or just an erratic running condition? One common culprit behind these issues is low fuel pressure. At Alliant Power, we understand the frustration this can cause, which is why we’ve created a comprehensive video guide to help you diagnose and repair low fuel pressure problems in your MaxxForce engine.

Recognizing the Signs of Low Fuel Pressure

Before diving into the fix, it’s crucial to recognize the telltale signs of low fuel pressure. These can include:

  • Noticeably reduced engine power
  • The engine stumbling or hesitating, especially under load
  • Inconsistent or erratic engine running
  • Difficulty starting the engine

If you’re experiencing any of these symptoms, low fuel pressure could be the underlying cause.

Our Step-by-Step Guide to Diagnosis and Repair

Our latest video walks you through a systematic approach to identify and resolve low fuel pressure issues in your International MaxxForce engine. We cover key diagnostic steps, including:

  • Checking for Air Intrusion: Air in the low-pressure fuel supply system can significantly impact fuel delivery. We show you how to check for and eliminate air pockets.
  • Verifying Fuel Pressure Specs: Knowing the correct fuel pressure for your engine is essential. We guide you on how to check your fuel pressure and determine if it’s within the manufacturer’s specifications.
  • Pinpointing the Problem Component: The low-pressure fuel system typically involves a fuel pressure regulator and a supply pump. Our video helps you differentiate between these components to identify the one causing the low pressure.
  • Real-World Repair Example: We take you through a practical example of a broken low-pressure supply pump, demonstrating the disassembly, diagnosis (highlighting a common issue like a broken internal spring), and the repair process.
  • Locating the Supply Pump: For those unfamiliar with the MaxxForce engine layout, we clearly show you the location of the low-pressure supply pump.

The Impact of a Faulty Supply Pump

As demonstrated in the video, even a seemingly small issue like a broken spring within the low-pressure supply pump can lead to significant fuel pressure fluctuations. This, in turn, can severely impact engine performance and potentially cause further damage if left unaddressed. Our video clearly illustrates how this component failure can manifest and the steps needed for a successful repair.

Alliant Power: Your Partner for MaxxForce Parts

At Alliant Power, we’re committed to providing high-quality parts for your diesel engines. Whether you need the complete high-pressure pump or just the low-pressure supply pump (available separately), we have you covered. We also stock a wide range of other components for your International MaxxForce engine.

Don’t let low fuel pressure sideline your MaxxForce! Watch our detailed video guide to gain the knowledge and confidence to diagnose and potentially repair this common issue. Get your engine running smoothly and efficiently again.