Where is the Fuel Pump on A 6.6 Duramax? – Reveal The Location, YES!

Where is the fuel pump on a 6.6 Duramax? There is no fuel pump in the 6.6 Duramax diesel engine. The Duramax works with a CP3 fuel injection pump to transfer the fuel from the tank to the engine. This injection pump is inside the fuel system on top of the engine.

But how is the injection fuel system? Actually, it is a pretty complicated arrangement. Finding the fuel injection pump in a 6.6 Duramax engine takes time. There is a fuel pump in the newer Duramax engine model introduced in 2017.

Go through this page if you need to find the injection pump or fuel pump on the Duramax engine. You will find the detailing location of the fuel pump on Duramax.

Where Is the Fuel Pump on A 6.6 Duramax?

As mentioned above, there is no lift pump or fuel pump on 6.6 Duramax. A lift fuel pump is standard in the diesel fuel system to run fuel towards the fuel injectors to ignite the engine system. But the Duramax diesel engine does not have this fuel pump.

GM produced millions of Duramax diesel engines from 2001 to 2016 without a fuel pump. The GMC, LML, Chevy Duramax trucks, and pickups do not have a fuel pump. Then what do they have to run the fuel? Duramax 6.6 diesel engine has a CP3 injection pump to transfer the fuel from the fuel tank to the engine. The LML Duramax has a CP4 injection pump, while other previous versions have a CP3 injection pump.

It has been changed with the introduction of the 2019 6.6 Duramax diesel engine. This is L5P 6.6L Duramax with a new OEM HP4 fuel pump. Until this 2019 Duramax introduction, lots of Duramax engines had driven and will drive billions of miles without the lift pump. They, generally, do not have any functional problems for this lacking.

Generally, a fuel pump is a lift pump that sits in the fuel tank and pushes the fuel in low-pressure conditions. As the fuel pump of most diesel engine, the 6.6 Duramax injection pump use the same way to pass the fuel, and this way starts from the fuel tank through the fuel filter into the fuel injection pump.

How does the injection pump work as the fuel pump? Actually, the Duramax diesel engine works well without the lift pump. It is possible because Bosch produces the injection pump for the Duramax diesel engine with a more robust design. That’s why the Duramax engine is capable of pulling the double duty.

Where is the Fuel Injection Pump on 6.6 Duramax?

For many reasons, including the replacement or checking, we need to know the 2005 Duramax fuel pump location and other Duramax injection pump locations until the fuel pump is added to the Duramax engine.

From 2001 to 2016, the 6.6 Duramax had a CP3 injection pump located in the front part of the engine valley.

Actually, the 6.6 Duramax engine is pretty complicated, and the elements are arranged like an onion. There are many layers like an onion which holds plumbing, wiring harness, fuel injection pump, etc. This fuel injection pump is located at a deep inside layer beneath the EGR cooler behind the Y-bridge of the thermostat housing section.

Also Read: Duramax Oil Capacity in All Unit Discussed!

It takes time to reach the fuel injection pump of a 6.6 Duramax diesel engine for this complex structure. Mechanic requires half shop day to repair the fuel injection pump of the Duramax.

Where is the Denso Fuel pump on L5P Duramax?

The 2017 GM HD pickup trucks to 2021 or present trucks include the Denso HP4 fuel injection pump on the L5P Duramax.

This Denso fuel pump is situated inside of the fuel tank. The major components of the fuel tank module are- the fuel level sensor, fuel pump, and fuel filter. There is a fuel transfer pump to support the fuel pump.

The fuel level sensor has a float, floating arm, and ceramic resistor located inside the fuel tank. The fuel strainer is situated between the lower end of the fuel tank to the fuel pump module.

The fuel pump is attached to the reservoir of the primary fuel tank. The fuel transfer pump is in the secondary fuel tank.

A Helpful Tutorial You May Need!

Frequently Asked Questions (FAQs)

Where is the high-pressure fuel pump located on a 6.6 Duramax?

The fuel tank has an auxiliary pump in the diesel engine. In this case, the injection pump is the high-pressure pump that controls the order of injectors’ openings. This injection pump is situated right next to the engine.

Does a Duramax have a fuel pump in the tank?

Duramax engine does not have a fuel pump. Instead, this engine has the CP3 injection to transfer the high-pressure fuel from the fuel tank to the machine. In 2017, Duramax, at last, introduced the engine with a fuel pump. So, new models of Duramax engines have a fuel pump.

How do you check the fuel pump on a Duramax?

To check the fuel pump on a Duramax, first, you must stroke the hand pump. The hand pump will first be soft and then hard. It means that you have to check the fuel rail pressure. If you find this pressure right, the fuel supply can be an issue.

Final Verdict

People may not know that there is no fuel pump on 6.6 Duramax. Then it will be a shock for them when they see the complex structure of the Duramax engine’s inner parts. If you know the detailed matter about the fuel injection pump of the Duramax and its location, it will make the work easier.

Where is the fuel pump on a 6.6 Duramax engine? You have learned the answer to this question on this page.

It is almost impossible to reach the CP3 fuel injection pump in a tangled arrangement. A professional hand is needed to make necessary replacements and repairs.

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Ronald Berit

Our chief editor, working 24/7 to ensure the precise and only quality data regarding different trucks.He is mastered with the ins and outs of cargo to off-road trucks of Dodge, Ford, Chevy, Toyota, GMC and more. This truck geek graduatedwitha Bachelor of automobile engineeringdegree and practiced through his own automotive parts repair center.

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