D-Max Fuel System Upgrade

More fuel means more power!

Last issue, the crew at Advanced Injection installed a complete, power-packed upgrade on our well-worn ’01 Chevy Duramax—originally, our off-roader project LB7. The upgrades included a Banks Power Big Hoss Bundle, including the larger Techni-Cooler intercooler, mandrel-bent, large-diameter boost tubes, Monster exhaust system, BigHead wastegate actuator and Six-Gun tuner with the Banks iQ interface, as well as a Fleece Performance Engineering LB7 63mm Cheetah turbo and Pro Fab Performance downpipe.

With more than 360,000 miles on the clock, the old dog has been running awesome after the install, but we can tell that the high-mileage LB7 CP3 high-pressure pump is weak and that we are leaving some power on the table. To remedy the situation, we once again turned to our friends at Fleece for a remanufactured LBZ CP3 that delivers more fuel than the stocker LB7 pump. We also picked up an AirDog II pump and filter system from Pure Flow to deliver plenty of well- filtered #2 fuel to the CP3.

Before we made the fuel system upgrades, we took our 2500 HD to DC Chassis Dyno, in Brownsburg, Indiana, and strapped it down to the DynoJet chassis dyno to see what the last round of performance modifications did.