Ameer Randolph
If you're experiencing issues with your 2005 Chevy Duramax Diesel's fuel pump, you may need to reset it. The Duramax engine operates the fuel supply system by vacuum, and while it doesn't use a fuel lift pump, it does have a fuel injection control module, a fuel rail pressure regulator, and an injection pump. Before attempting any repairs or resets, it's important to consult a professional mechanic or a trusted forum for specific guidance on your vehicle's make and model.
| Characteristics | Values |
|---|---|
| Fuel pump reset method | Press and hold the select button for five seconds while the "FUEL FILTER LIFE" message is displayed |
| Fuel filter reset method | Turn the key on, and press the throttle pedal 3 times to the floor quickly |
| Fuel pump location | On the engine |
| Fuel supply system | Operated by vacuum |
| Fuel injection control | Module and fuel rail pressure regulator |
| Injection pump | CP3 (does not use a fuse/relay) |
| Fuel pump relay issue troubleshooting | Check for corroded connections, swap relays with another component (e.g. daytime running lights relay) |
| Fuel pump priming | Unscrew the small black plastic plug on the fuel filter mount, pump the primer until fuel flows out, tighten the plug, pump the primer again |
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What You'll Learn
Resetting the fuel filter display
Method 1: Using the Steering Wheel Controls
- If your vehicle has steering wheel controls, locate the gas pump button and press it once or repeatedly until the fuel filter life % appears on the display.
- Once the fuel filter life % is displayed, locate the reset or return arrow button, which may be on the right side of the steering wheel, and press it. This should reset the fuel filter life % to 100%.
Method 2: The Brake/Accelerator Method
- This method involves using the brake and accelerator pedals to reset the fuel filter display.
- Turn the key in the ignition to the 'on' position without starting the engine.
- Quickly press the throttle pedal (accelerator) three times to the floor.
- This method may be effective in resetting the fuel filter display and turning off the "CHANGE FUEL FILTER" message.
Method 3: Resetting the PCM Fuse
- In some cases, resetting the Powertrain Control Module (PCM) fuse may help resolve issues related to the fuel pump and filter display.
- Locate the fuel pump relay in the fuse box and remove it.
- Check for any signs of corrosion or damage on the relay and the fuses.
- Replace any blown fuses and reinstall the relay.
- Start the vehicle to see if the fuel filter display has been reset.
It is important to note that the specific steps may vary depending on your vehicle's model and features. Always refer to your owner's manual or seek assistance from a qualified mechanic if you are unsure about any of the procedures. Additionally, exercise caution when working with the fuel system to avoid any safety hazards.
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Priming the pump
To prime the pump of your 2005 Chevy Duramax Diesel, follow these steps:
First, locate the fuel filter. On top of the part where the fuel filter mounts, you will find a small black plastic plug. Carefully unscrew this plug a couple of turns, being cautious not to damage it.
Next to the plug, you will see a round primer pump. Pump the primer several times until you observe a steady flow of fuel emerging from the black vent plug. Ensure you do not overtighten the plug, as this can cause damage.
Once the fuel is flowing freely, pump the primer a few more times until you feel resistance, indicating that the primer is adequately primed. Now, attempt to start your vehicle.
If your vehicle fails to start, there may be other underlying issues or complications. It is recommended to consult a professional mechanic or seek further troubleshooting advice if priming the pump does not resolve the issue.
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Locating the fuel pump relay
The fuel pump relay in a 2005 Chevy Duramax Diesel can be found in the under-hood power centre or fuse box. This is because GM uses the same fuse box for gas engine trucks, and the Duramax uses an injection pump to draw fuel through the lines and fuel filter.
The fuel pump relay is used to provide power to the ECM and fuel pressure monitoring. When the relay is open and the engine is running, the truck sets a P0090 code and goes into limp mode.
The Duramax does not use a fuse or relay, but the ECM does. The fuel pump relay can be identified by the label on the relay, and it is important to note that the truck will not run if this relay is pulled.
The relay can be swapped out if there are issues with the truck starting, and it is a good idea to check the wiring diagrams in the FSM to identify the correct wires and their colours.
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Checking the PCM fuse
The Power Control Module (PCM) fuse is an essential component of your Chevy Duramax Diesel's electrical system. It is responsible for feeding power to various systems, including the fuel pump relay and the Engine Control Module (ECM). Checking the PCM fuse is a straightforward process and can help you identify and troubleshoot any potential electrical issues. Here is a step-by-step guide on how to check the PCM fuse in your 2005 Chevy Duramax Diesel:
Locate the PCM Fuse: The PCM fuse is typically located under the hood of your vehicle, near the engine. It is usually clearly labelled as "PCM" or "PCM B" to distinguish it from other fuses.
Check the Fuse Condition: With the fuse located, you'll want to inspect its physical condition. A blown fuse will often appear burnt or damaged. Sometimes, the wire inside the fuse may be melted or broken, indicating that it needs to be replaced.
Use a Multimeter: To definitively check if the PCM fuse is blown, you can use a multimeter. Set the multimeter to the appropriate setting, typically the lowest ohms setting, and touch the probes to the metal ends of the fuse. If there is no continuity or infinite resistance, the fuse is blown and needs to be replaced.
Replace the Fuse: If the PCM fuse is blown, replace it with a new fuse of the same type and rating. Ensure you use a fuse with the correct amperage rating; for the PCM B fuse, it is typically a 20-amp fuse.
Test After Replacement: Once you've replaced the PCM fuse, start your vehicle and observe whether any warning lights or issues persist. If the problem was solely due to a blown PCM fuse, your truck should now operate normally.
It is important to note that a repeatedly blowing PCM fuse may indicate a more serious underlying issue. If the fuse blows again after replacement, further diagnostics and troubleshooting may be required to identify the root cause. Refer to a certified mechanic or a Chevy Duramax Diesel forum for specific advice pertaining to your vehicle.
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Identifying the injection pump
The injection pump in a Chevy Duramax diesel engine is buried deep in the valley of the engine. It is responsible for drawing fuel from the tank to the engine and pressurizing it. This is a challenging task that places a lot of stress on the injection pump.
The CP4 injection pump, found in the 2011-2016 LML Duramax models, is particularly notorious for causing issues. To access and identify this pump, you need to remove several components, including the air intake system, the turbo inlet, the air filter, and the upper intake elbow. Additionally, the L-shaped EGR coolers and the intake Y bridge need to be taken out to gain access to the pump.
In contrast, earlier models of the Duramax engine featured the CP3 injection pump, which was manufactured by Bosch. This pump was a mechanical pump mounted in the engine valley, tasked with drawing fuel from the tank via suction or vacuum.
It is important to note that the injection pump is not the same as the lift pump or the primer pump in the filter head mount. The injection pump is a critical component of the fuel system, and its proper maintenance, including regular fuel filter changes and the use of fuel additives, is essential to ensure the engine's performance and longevity.
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Frequently asked questions
If your vehicle has steering wheel controls, press the gas pump button once or until the fuel filter life % comes up, then press the reset or return arrow button.
Try the brake/accelerator method.
Unscrew the small black plastic plug on top of the part the fuel filter mounts to. Next to the plug, you'll find a round primer pump. Pump the primer several times until you get a good flow of fuel out of the black vent plug. Tighten the plug and pump the primer several more times until it gets hard to push.
If your truck is not starting, check the fuse panel and the relay labelled "fuel pump". If the relay is faulty, your truck will not start.
No, it does not. The fuel pump, which is the injection pump, is on the engine.
