The fuel takes the same path from the tank, through a filter, and into the injection pump, except now the CP3 is responsible for sucking fuel from the tank.
But for some strange reason, the 6.6 Duramax came from the factory sans lift pump. Finally, once the pressurized fuel enters the injector, it either gets sprayed directly into the cylinder to make a big boom, or if there is extra, it flows back to the tank through the injector return to start its journey all over again.Įvery one of those components can be found on just about every diesel pickup made in the US for at least the last 20 years, whether it’s an HEUI Powerstroke, a 12-valve Cummins, or even the old 6.5 GM Diesels. Most of the high pressure fuel inside the rail gets sent straight into the injectors, but there are some conditions like sudden deceleration or a drop in fuel demand which will cause a pressure relief valve to open up and send excess fuel from the rail back to the tank. Next, the fuel enters the injection pump, where it can go one of two places: it either gets pressurized and sent to the rail or goes back to the tank in a return line. Since diesel by nature is a dirty product, there is always at least one filter between the low-pressure pump and the engine to remove any dirt and contaminants, and likely there will be a water separator to remove any H2O which condenses in the tank. Depending on the model, you might have between 25 and 40 gallons of capacity, and on most trucks there is a low-pressure fuel pump which sits inside the tank and pushes the fuel toward the engine at a relatively low pressure. It all starts in the tank, which is where the fuel is stored whenever you fill up. There are many parts which make up the fuel system on a common rail diesel truck, and the path the fuel takes is like a choose your own adventure book there are many different options. It was a great powerplant and was the first of the big 3 to come equipped with common rail fuel injection, but there was one item missing which every other diesel pickup had before and since: a lift pump.
One such automotive mystery was started in 2001, when GM introduced the Silverado HD’s powered by the 6.6-liter Duramax diesel V8. While there have been several theories, to this day nobody knows the answer to either. There are many great mysteries which have remained unsolved over the years, ranging from what’s at the bottom of the Bermuda Triangle to what happened to D.B. This kit will not produce more fuel pressure than the engine ECU requests it will only increase fuel volume as needed to maintain ECU requested fuel pressure.įor racing applications, this kit provides fuel flow to maintain fuel pressure to 26,000+ psi that is essential for highly modified race engines that are seeking to produce high horsepower.
In the event of one pump failing the electronic controller will automatically switch all fuel delivery responsibilities to the remaining operational pump. Both pumps work together, each delivering half the total volume of fuel required. Our PPE belt-driven Bosch CP3 fuel pump kit works in conjunction with the stock fuel system and is controlled by a sophisticated microprocessor module.Īdding our kit to your stock fuel system reduces drive load on the stock CP3 pump, thereby increasing pump reliability. D-701-22)īolt this kit on and your engine computer will automatically recognize both pumps and continue to deliver the precise amount of fuel your engine computer is requesting.
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