1970 Chevy Monte Carlo LS Swap EFI Fuel Tank Kit with 255 LPH Pump Notched
Swapping an LS power plant into a 1970 Monte Carlo demands precise underbody packaging and consistent fueling. The 1970 Monte Carlo EFI fuel tank kit with its 255 LPH pump and notched shell meets these needs by tracing the A Body frame rails to maintain exhaust and wheel well clearance without modifying the floorpan. Built to support engines up to 550 hp the submerged pump module delivers steady flow under acceleration while the calibrated sending unit provides accurate level feedback during hard cornering. An inline vent filter captures vapors before they escape extending seal life and promoting stable pressure control.
Optimized Notched Shell for Frame Rail Integration
The notched tank shell is crafted from heavy gauge steel precisely shaped to follow the contours of the 1970 Monte Carlo A Body frame rails. By tracing the original rail profile, it clears modern exhaust routing and wider wheel setups without requiring floorpan trimming or loss of ground clearance. This approach preserves the classic underbody lines and uses factory mount points for a true bolt-in fit that maintains chassis strength. The rigid steel structure resists deformation under load, protecting both the fuel reservoir and adjacent sheet metal during spirited driving or highway cruising.
Submerged Pump Module for Consistent LS Fuel Delivery
At the heart of the kit lies a 255 LPH Walbro pump fully immersed in fuel to eliminate foaming and cavitation under heavy acceleration or sustained high engine speeds. An integrated check valve holds pressure in the feed lines on shutdown, delivering near-instant fuel flow at startup and reducing cranking cycles. The in-tank module also shortens fuel line length and centralizes wiring, which minimizes potential leak points and simplifies routine maintenance. Rated to support engines up to 550 horsepower, this assembly delivers stable flow under boost or wide open throttle conditions.
Calibrated Sending Unit Ensuring Accurate Level Feedback
The included sending unit features a low-friction float arm and a precisely mapped resistance curve to deliver reliable signals to both the factory gauge cluster and modern engine management systems. Its compact design resists fuel slosh and float hang-up when cornering or accelerating hard, which eliminates false empty warnings and helps prevent unexpected lean conditions. Sealed electrical connections and corrosion-resistant internals extend service life in demanding environments, ensuring steady gauge operation and clean data for electronic control units over years of use.
Vent Filter Design Enhancing System Safety and Seal Longevity
An inline vent filter captures moisture and debris before they enter the tank, helping to maintain balanced internal pressure as temperatures and fuel volume change. By preventing vapor buildup, it reduces stress on seals and hoses, lowering the risk of vapor lock or premature component wear. The complete kit also includes tank straps, a filler neck with factory-angle replication, gaskets and mounting hardware sized for the original frame rails. This ensures a straightforward installation and a finished result that looks and functions like OE equipment.
This fuel tank kit provides a precise fit and consistent flow for your LS swap. To step up to a Larger capacity fuel pump Kit at 400 LPH see our 1970 Monte Carlo 400 LPH pump Tank Kit (notched).