EFI In-Tank Fuel Pump Conversion Kit and DIY Install
Converting a classic carbureted or thirsty mechanical-fuel-injection vehicle to electronic fuel injection usually means the stock low-pressure pickup cannot meet modern system demands. A dedicated EFI in-tank fuel pump conversion kit supplies the higher, steady fuel pressure an injector rail needs while keeping the pump submerged, cool, and quiet. A DIY in-tank fuel pump swap is a significant project because it opens the fuel tank, but the right module, hanger, wiring, and return-line approach can make the car behave consistently during hard cornering, hot starts, and altitude changes.
Essential answer
An EFI in-tank fuel pump conversion kit is the core hardware change for feeding an aftermarket or factory electronic engine-management system. It installs a high-output electric pump directly inside the tank, usually on a new hanger or baffle tray, so the supply side delivers a stable column of fuel under pressure. This differs from a frame-rail pump or a low-volume mechanical pump because the pump sits in liquid, which cools it and reduces vapor formation during heat soak.
For a DIY in-tank fuel pump install, the job is more than swapping the pump itself. You must address the sender opening, secure the module at the correct depth, route high-pressure-rated hose, upgrade wiring through a sealed bulkhead, and usually add or enlarge a return fitting. Many conversion kits are sold as an EFI in-tank fuel pump kit with a weld-on or bolt-in flange, but the final fitment still depends on the tank shape and the existing filler neck and vent path.