When we recently had the option to equip our 6.7L Cummins-powered ’07½ Dodge Ram Mega Cab with one of Titan’s XXL 52-gallon fuel tanks, we jumped at the chance. Increasing our range, having the ability to fill up with cheaper fuel when we find it, not cluttering our bed with an external transfer tank, and replacing the stock tank with an OE-quality polyethylene unit that’ll never rust? That’s a no-brainer. With the factory tank pulled, we also decided to take advantage of the easy access and made some other modifications to the 6.7L Cummins’ fuel system in order to optimize the injection system’s durability, as well as support more power-adders in the future.
| 1000 Miles To Empty 2007 Dodge Ram Mega Cab At Gas Station
Fuel Air Separation System’s (FASS) Platinum 95 system (PN P-D07-095G) was best for our needs and came with everything required for the installation. During the install (and in order to avoid drilling into our brand-new Titan fuel tank), we opted to run one of Vulcan Diesel Performance’s Jeep Liberty fuel modules for our in-tank pickup needs (as opposed to the suction tube supplied with the FASS system). Vulcan’s fuel module is equipped with one of its ½-inch Draw Straw II assemblies. This gave us peace of mind because it ensures a constant reservoir of fuel at low tank levels. In short, the Draw Straw-equipped Liberty canister makes installing a FASS or other aftermarket pump in a ’98½ to ’08 Dodge a slam dunk. Read on to see everything else we upgraded in our fuel system.
| We brought our Dodge and components down to Diesel Tech in San Jacinto, California, for the install. Technician David Briggs racked our Dodge and got busy underneath yanking the stock tank. The factory fuel pickup line from the tank to the rear of the stock fuel filter canister was removed. Thanks to careful parts selection, we were able to retain the factory fuel return line.
Mileage Report
To make the title of this story a reality and not just a catchy cover blurb, we set out to see if we could actually rack up 1,000 miles between fill-ups. With a 52-gallon-capacity fuel tank in our truck, we’d need to average 19.23 mpg. That’s obtainable on the highway, but with all the mileage-killing emissions equipment in place, we had to dig deep into our bag of tricks. Mileage testing began before the actual installation and consisted of between 1,500 to 2,500 miles of hand-calculated, GPS-verified number crunching for each finding. Here’s how it ran down:
| The Vulcan Draw Straw-equipped Liberty canister is a big part of why our installation was so easy. With its ½-inch pickup tube located inside the canister (where the fuel return dumps), it allows for a constant reservoir of fuel to draw from. The Liberty sending unit employs the same ohm readings as the factory Ram sending unit, so our fuel gauge function remains unchanged.
Baseline specs:
- Stock 6.7L engine
- Stock 68RFE transmission
- S&B cold-air intake
- Dynatrac Free-Spin hubs
- 285/75R17 Toyo tires
- Snugtop shell
- Stock fuel system
- Average Fuel Economy: 17.5 mpg
With Current Modifications:
- Titan XXL 52-gallon tank
- FASS Platinum 95
- Glacier Diesel Power MK-2 and Big Line fuel system
- Bully Dog Triple Dog GT tuner set to Tow mode
- Replaced tires with shorter, lighter 285/70R17 BFGoodrich Rugged Terrains
Average Fuel Economy: 20.0 mpg
Distance to Empty = 1,040 miles
