1967-1972 Chevy Truck LS Frame Mount Gas Tank with Side Fill and 400 LPH Pump
When installing an LS powerplant in a 1967 to 1972 Chevy pickup, this frame mount gas tank with side fill and 400 LPH pump solves underframe clearance constraints while ensuring consistent fuel delivery. It slides under the frame rails on contour matched flanges that line up with original mounting points, so there is little need for drilling or modifications. Inside, baffle plates channel fuel toward the pump inlet to prevent starvation during cornering or sudden stops, and the genuine Walbro 400 LPH unit supports engines up to 750 horsepower. Galvanized steel construction with a powder coat finish protects against road salt and moisture, and the integrated 0 to 90 ohm sending unit connects directly to factory gauges for accurate readings.
Custom Underside Mounting to Preserve Frame Clearance
This tank is engineered to slide precisely under the frame rails of a 1967 to 1972 Chevy or GMC pickup during an LS engine swap. Contour matched flanges align with original mounting points, requiring minimal drilling or modification and preserving original body clearance and ride height. By fitting snugly beneath the chassis, it keeps valuable underbody space available for exhaust routing or steering components. Installers benefit from a fast, clean fit that resists movement under load and maintains a factory-like appearance.
Internal Baffle Plates for Reliable Fuel Flow
Strategically placed baffle plates divide the tank into separate chambers that guide fuel toward the pump inlet at all times. During hard cornering or sudden stops, these internal barriers prevent air pockets from forming and ensure a continuous feed. This design is especially critical for spirited driving or heavy towing, where sudden shifts in fuel can lead to cavitation and erratic engine performance. The result is consistent pressure, extended pump life, and trouble-free operation under demanding conditions.
Walbro 400 LPH Pump and Seamless Gauge Integration
At its heart sits a genuine Walbro 400 LPH unit capable of supporting engines up to 750 horsepower with stable flow and pressure. Mounted low in the tank, the pump benefits from gravity feed that reduces wear on internal components and extends service intervals. An integrated zero to ninety ohm sending unit interfaces directly with factory dash gauges, eliminating the need for adapters or calibration modules. This combination delivers modern EFI readiness while keeping wiring straightforward and maintenance simple.
Galvanized Steel Shell and Corrosion Protection
Constructed from fully galvanized steel, this tank stands up to rust and corrosion on both interior and exterior surfaces. A durable powder coat finish adds an extra layer of defense against road salt, moisture, and debris impact. Even weld seams and mounting flanges receive full coverage to prevent early-stage corrosion and preserve structural integrity. The result is a fuel tank that maintains its strength and appearance through years of use in harsh environments.
Count on durable construction and precise fit. To explore the same gas tank but with a smaller capacity pump at 255 LPH see our 1967-1972 Chevy Truck Frame Mount Gas Tank - Side Fill - 255 LPH Pump.