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A fuel system is essential for sending the right amount of fuel at the required pressure to the engine. In the process of delivering the fuel to the engine, components such as the fuel pump, fuel pressure regulator and fuel filter are involved. sells authentic FASS Diesel Fuel Systems parts and accessories at the lowest prices. FASS Diesel Fuel Systems, a brand based in Marthasville, Missouri, specializes in the production of fuel air separation systems (FASS) and fuel pumps. The company also manufactures fuel pressure regulators, semi frame brackets and kits for parts such as suction tubes, fuel sumps and electric heaters. The parts offered by the brand are developed to increase the fuel economy, power and life of the part, while reducing the emissions in your vehicle. With an enduring presence of over 20 years in the market, the brand strives to deliver industry-leading fuel separation systems and accessories. All parts are subjected to meticulous testing before they are retailed to the customers. FASS Diesel Fuel Systems provides a warranty for all its components.


Delivering debris-free fuel into the engine is vital to achieve the optimal horsepower generated in the engine. The debris in the fuel can be detrimental to the engine, causing it to wear out prematurely. The brand's filtration systems are designed to remove every possible impurity from the fuel including air, water and oil. Fuel air separation systems (FASS) are composed of diesel lift pumps and fuel filtration systems with inherent water and air separation facilities. They are compatible with Cummins, Powerstroke and Duramax diesel engines. The FASS systems are fitted for various makes including Dodge, Ford and Chevy, and a wide range of Class 8 semi-trucks. They are also available as universal-fit models.


The brand's fuel air separation systems (FASS) are offered under the Titanium Series. The flow rate of the fuel pump's motor in the Titanium series can reach up to 260 gallons per hour (gph). The fuel filtration method in the system has the capability to separate debris as small as 3 microns in size. These Titanium systems are available as kits that come with the complete hardware essential for installation. The series is offered for various ranges of horsepower. The FASS systems are developed using the experimental FST (FASS Silencing Technology) to reduce the noise produced in the system. The FASS systems' Performance Radius Cuts (PRC) enables the fuel to flow seamlessly into the engine.

The fuel pumps are available in Adjustable (ADJ), Dura-Max Flow Enhancer (D-MAX) and Dodge Replacement Pump (DRP) variants. The adjustable fuel pumps let the user change the fuel pressure. The flow rate of the adjustable fuel pump varies from 90 to 260 gph. The Dura-Max Flow Enhancer (D-MAX) fuel pumps reduce the air and vapor in the fuel, thereby providing an optimal efficiency. A fuel pressure regulator adjusts the amount of fuel pressure, in relation to the engine speed. The FASS fuel pressure regulator is built with 6061 T-6 aircraft quality aluminum. The brand offers Duramax Fuel Filter Delete (DFD) Kits that are used to remove the factory-fitted fuel filter after installing a FASS fuel air separation system. is proud to stock FASS Diesel Fuel Systems parts and accessories. Place an order here for auto parts and get them delivered as soon as possible.