Authorized FASS Fuel Systems Dealer in Austin, TX

A diesel injection system is only as healthy as the fuel reaching it. FASS builds lift pumps with filtration and air separation in one unit — a steady supply, with water, debris, and entrained air taken out before the fuel gets to the high-pressure side. We sell the line and fit it to trucks we already service.

What being a dealer means here

Modern Diesel is an Authorized Dealer of the DPP/FASS Product Line. FASS Diesel Fuel Systems are made by Diesel Performance Products, Inc. of Marthasville, Missouri; we sell the line as well as fit it, and a warranty question comes to the people who did the installation instead of to a retailer who never saw the truck. FASS's own warranty comes with every unit, and you get its terms from us at the counter.

The FASS line we carry

• Titanium Signature Series PLUS fuel systems
• No-Drop kits
• Drop-In Series (in-tank) pumps
• Universal Class 8 and industrial systems
• Competition Series systems
• FASS Connect
• FASS filter packs and replacement filters
• Fuel tank sumps and pickups
• FASS accessories

What we fit

• Lift pumps with fuel-air separation — Frame-mounted pump and filtration units for diesel pickups.
• Drop-in (in-tank) pumps — In-tank units where the platform has one, for a factory-style installation.
• Medium-duty and Class 8 systems — Units sized for semi tractors, vocational trucks, and working diesel equipment.
• Filters and water separators — Replacement elements, changed on the interval the truck actually needs.
• Tank pickup, lines, and fittings — The supply-side hardware, routed and secured so it survives a working truck.

Platforms

• Ram 2500 and 3500 (Cummins)
• Ford Super Duty (Power Stroke)
• Chevrolet and GMC HD (Duramax)
• Medium-duty and Class 8 diesels

Diagnose first, then fit the right one

Every common-rail diesel runs better on steady, clean, air-free fuel, and a weak supply side is a common cause of hard starts, low power under load, and rail-pressure codes. Those symptoms can also involve the high-pressure side, a sensor, or wiring, so we test the system in the same visit: the kit goes on together with whatever else the truck needs, sized for the way it is worked, and the truck leaves right.

Installed like it has to last

The installation is most of the job: where the unit mounts, how the lines are routed and secured, how it is powered and fused, and how the tank pickup is handled. We do fuel-system work every day, so it is fitted by the same people who will see the truck at its next service.

Filters are part of owning one

The filter and water separator do the work, so they have a service life. We supply the replacement elements and change them on the interval the truck actually needs — see maintenance schedules — and on a fleet account they go on the PM calendar with everything else.

Fitting them across a fleet

Two or more vehicles is a fleet. If your trucks already come to us for scheduled maintenance, the work can be done while they are here rather than taking each one off the road a second time. Fleet sales: 512-273-7351.

Tell us about the truck

Year, engine, how it is worked, and what it is doing. That decides whether this is the right part faster than a model number does. Call 512-717-2777.

FASS and FASS Diesel Fuel Systems are trademarks of Diesel Performance Products, Inc.

Related

• Truck accessories & aftermarket
• Diesel diagnostics
• Fuel injectors & fuel system repair
• Performance & reliability

Common questions

Are you a FASS dealer, or do you just install them?

We are an authorized FASS dealer. We sell the line as well as fit it, and a warranty question goes to the people who did the installation rather than to a retailer who never saw the truck.

What does a lift pump with air separation actually do?

It moves fuel from the tank to the engine at a steady supply pressure and filters it on the way, taking out water, debris, and entrained air before the fuel reaches the high-pressure pump and injectors. Every common-rail diesel runs better on fuel like that, and the ones that work hardest or fuel from a transfer tank notice it soonest — tell us what the truck does and we will tell you which kit fits it.

Will it help with my hard start or my low-power problem?

Often it is part of the answer. A weak supply side — low pressure, air in the fuel, a dirty filter — is a common cause of hard starts, low power under load, and rail-pressure codes, and a lift pump with filtration addresses all three. Those symptoms can also involve the high-pressure side, a sensor, or wiring, so we test in the same visit and the kit goes on together with whatever else the truck needs.

Does a FASS system change my emissions equipment?

No. It sits on the fuel supply side, ahead of the injection system. It does not touch the DPF, the DEF and SCR system, the EGR, or the engine calibration.