2004 duramax fass pump driver#
The engine will still run, and in fact, the truck can still drive just fine, but the driver may notice a loss of acceleration. The result will be a drop in rail pressure, sometimes by as much as half.
When the fuel demand goes up, the injection pump can no longer keep up with both of its jobs, and even something as small as a towing tune can cause problems in extreme conditions like a fully loaded climb up a mountain pass. The problems start when you increase the horsepower output of the engine, since more horsepower is made by injecting more fuel. If your Duramax is bone stock, chances are it will drive OK for a while without a lift pump. 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. So, if you drive a 2001 to 2016 Duramax and you’ve been considering a lift pump upgrade, today is your lucky day. On paper, this design works pretty well, but in the real world there are many situations where the lack of a lift pump can cause a problem, and sometimes, the driver won’t even notice. Inside both the CP3 and CP4 is a gear pump that feeds fuel into the high-pressure section, but the gear pump also creates suction that pulls fuel from the tank. The reason the Duramax can operate without a lift pump is because when Bosch designed the injection pump, they made it capable of pulling double duty. So, what’s the big deal? GM made millions of Duramax diesels between 20 without a lift pump, and collectively, those engines will have driven billions of miles with no functional problems attributed to the lack of a lift pump. The reason this is so perplexing is because the Bosch CP3 and CP4 injection pumps GM used without a lift pump were also used by Ram and Ford WITH a lift pump, and it wasn’t until the L5P debuted in 2017 that GM finally installed a lift pump on their trucks.
Both Cummins and Powerstroke diesel engines use a lift pump, but for some reason, GM decided they didn’t need one for the Duramax. The injection pump raises the pressure of the fuel so it can be forced directly into the combustion chamber in tiny droplets where it gets ignited by the heat and pressure created by the rising piston. A lift pump is a low-pressure fuel pump that sits in or near the fuel tank, and it delivers fuel up to the high-pressure injection pump, which is driven by the engine. GM did something a little different than Ram and Ford in their 6.6-liter common rail diesel, and it made quite a few people scratch their heads trying to figure out their logic.
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