The 5.9L and 6.7L Dodge Cummins engine is a workhorse that embraces aftermarket high performance products that offer incredible boosts of horsepower and torque. The problem is Cummins has a history of problems associated with its fuel delivery system.
Early model Cummins with the engine mounted fuel pump were so problematic, like quarter tank fuel starvation for instance, that Dodge issued a TSB (technical service bulletin) in regards to fuel delivery issues, and many of these were then retrofitted with newer in-tank lift pumps, but never officially recalled. Generally, a late model stock Cummins will run fine with the factory in-tank sending module, however it can't keep up with the demands of a highly tuned engine, or even filter injector killing air bubbles, water particulates and fuel vapor, which dramatically reduce any performance gains.
To combat this, the newly improved CARB-certified (California Air Resources Board) and adjustable PureFlow AirDog II air/fuel separator and filtration system was developed to work with an in-tank fuel sending module, which allows for much higher volumes of cleaner diesel to be drawn from the tank without resorting to an external draw-straw. Essentially, the complete PureFlow AirDog II kit feeds a constant supply of clean fuel to the injectors, and then whatever is not used by each injector, is trickled back to the tank, so there's never a shortage of fuel in the injector rail. Other kits also available for Ford and Chevy trucks.
The new AirDog II pump is...
The new AirDog II pump is patented and CARB (California Air Resources Board) certified-both good reasons to count on AirDog II for your fuel delivery needs. Removing the bed or dropping the fuel tank is probably the most difficult aspect of the installation.
The latest hardware for AirDog...
The latest hardware for AirDog II includes quick-connect lines, making the installation easier.
You don't have to have a highly...
You don't have to have a highly modified vehicle to justify the kit upgrade either, in fact, the late model Dodge shown here, was a stock daily driver that was driven frequently to Mexico's surfing spots along the coast, and never used for performance.
As we mentioned, the factory Dodge fuel system is fine for stock vehicles, but if the horsepower and torque is increased by the use of aftermarket products, the stock filtering system can't adequately handle the fuel that high performance engines require, leaving the door open to impurities, excess foaming and other power killing gremlins. While there are similar systems on the market, the PureFlow AirDog II kit is expertly crafted to fit like OEM, and it's easy to install thanks to new quick connect lines that give it a professional, almost factory appearance.
The old fuel sending module...
The old fuel sending module on the right is clogged with dirt and grime. This eventually gets into your injection system.
You don't have to have a highly modified vehicle to justify the kit upgrade either, in fact, the late model Dodge shown here, was a stock daily driver that was driven frequently to Mexico's surfing spots along the coast, and never used for performance. The owner had complained to OC Diesel Shop of "bad gas," which was slowly pitting his injectors and making his trips unreliable at best. He needed to filter out any chance of water getting to the engine on his next fill-up in Mexico. Installing a system like AirDog II sets an end-user up for future engine upgrades, and so they'll never have to deal with the limitations of the stock fuel system again.Thanks for the folks at OC Diesel Shop, we followed along as technician Greg Nelson took us through the process step-by-step.
The Overview
One of the most time consuming aspects of the upgrade was removing the factory fuel tank. You don't have to drop the tank, if you are able to lift the truck bed instead. But in our case, Greg had to drop the stock tank in order to access the stock fuel sending module because the truck had a large camper. Once he removed it, he replaced the sending unit with a newly revamped unit from AirDog that has larger fuel lines (1/2-inch) and better capacity.
"The entire installation was hassle free, and I really liked the fact that the new PureFlow AirDog II kit is plug and play. Everything was included," Greg said. "The PureFlow AirDog II kit gives the end-user the ability to push more power through a larger diameter hose for better fuel flow, and it is adjustable."