FASS Fuel Systems Titanium Signature Series Diesel Fuel Lift Pump, 100GPH (TSC12100G)
Fits 2015-2016 6.6L Duramax V8 (LML)
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A fuel pump that mounts in the fuel line between the tank and the engine to boost weak stock fuel pressure and add extra filtering ahead of the injection system. This truck's factory setup doesn't have a strong dedicated lift pump, so this fills that gap and protects the injectors from water and debris in the fuel.
why this one — This is the 100GPH bracket-mount version sized for the 2015-2016 Duramax LML, built for a stock or mildly modified truck rather than a full race build. FASS backs it with a lifetime warranty and rates it to support up to 600 hp, so an owner who adds a tune or bigger injectors later doesn't have to replace it.
Sold as a fuel-delivery and filtration upgrade, not a horsepower claim. FASS does not publish an hp or torque figure for this lift pump -- it restores the dedicated lift-pump pressure the factory system lacks and adds 2-micron filtration ahead of the engine's high-pressure pump. The retailer page mentions a customer-reported 2-3 mpg average, but that is an anecdotal owner claim, not a tested or manufacturer-published figure, so it is not being recorded as a performance gain.
Questions about this category
No published gain figure for this part, and nothing here is a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See our affiliate disclosure.