How does the Duramax fuel system work?

How does the Duramax fuel system work?

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.

Does a 2008 Duramax have a fuel pump in the tank?

The GMC and Chevy Duramax pick-up trucks do NOT have a lift pump to supply fuel to the engine. From the factory, the CP3 injection pump is the truck’s only means of getting fuel from the tank to the engine.

Does a 2008 Duramax have an electric fuel pump?

The duramax cab/chassis trucks have two fuel tanks, and an electric pump to transfer fuel between the two.

What fuel pump is on a LMM Duramax?

CP3 Injection Pumps Duramax LMM.

What year Duramax has lift pump?

So, if you drive a 2001 to 2016 Duramax and you’ve been considering a lift pump upgrade, today is your lucky day. We’re going to cover it all: when you need a lift pump on a Duramax, the different styles available, along with different options and upgrades, and the benefits you will see after adding one.

What year Duramax has the CP3 pump?

2001 to
The CP3 was a stalwart performer in 6.6-liter Duramax diesels from 2001 to 2010, and it’s been the heart of Cummins 5.9-liter and 6.7-liter engines since 2003.

How long does a Duramax fuel pump last?

On average, a vehicle’s water pump should last well over 100,000 miles. Unfortunately, those who drive Duramax 6.6-liter engines usually have to replace theirs by 80,000 miles. In some cases, the pump will last to 100,000 miles, but it usually fails much earlier than an average water pump does.

What year did Duramax stop using CP4 pump?

From 2011-2016 GM also used the CP4 in the LML & LGH Duramax engines, switching to the Denso HP4 in 2017 when the L5P was released. Interestingly, Dodge waited eight full years until 2019 to incorporate the CP4 on the 6.7L Cummins and then reversed course relatively quickly, going back to the CP3 in 2021.

How do I know if I have cp3 or CP4?

Basically whe a cp3 quits working it just quits without exploding. It’s typically a slow decline. The cp4 on the other hand doesn’t have a pinned piston and if it rotates slightly it tends to explode and send tiny bits of metal all through your fuel system.

How long does a Duramax cp3 last?

250,000 miles
The Bosch CP3, used on the ’01-to-’10 Duramax and ’03-to-current Cummins engines, is known to last 250,000 miles or more before needing to be replaced. Of course, performance enthusiasts also know these pumps are only capable of supporting approximately 500 hp.

What year Duramax has CP4 pump?

The Bosch CP4 pump is a high-pressure fuel pump, or injection pump, that debuted in 2011 in the Ford Powerstroke and GM Duramax engines.

What year Duramax has CP4 problems?

According to, the 2011-2016 Duramax suffers from a high pressure fuel pump issue unique to this year-range model. Failure of this CP4 pump is usually catastrophic, causing metal particulates to contaminate the entire fuel system.

How much does it cost to replace a CP3 pump on a Duramax?

2-to-CP3 conversion is about $3,500 for parts and labor. That might take the breath away from many Duramax owners, but compared to the $8,000-plus it costs should the CP4. 2 fail, it’s a bargain.

Does a cp3 need a lift pump?

A lift pump should be the absolute first thing you do to the truck. Cp4 or cp3, doesnt matter. You need to get that fuel from the tank up to the injection pump. If you’re wondering if a lift pump will prevent the failure of the cp4 the answer is no.