LS Swap Fuel System Explained Everything You Need to Know

If you are planning an LS swap, the fuel system is one of the most important parts of the entire build. In this video, I break down everything you need to know about LS swap fuel systems, including blow through carb setups versus EFI. We cover fuel pump selection, fuel line sizing, fuel pressure requirements, regulators, loose reference fuel systems, and how boost referenced fuel pressure actually works. I explain the differences between blow through carburetors and EFI, why each system needs a different approach, and what mistakes commonly cause pressure drop or lean conditions under boost. This video also goes over using sumps on stock fuel tanks, when an external pump makes sense, and when a return style system is the better option. Whether you are building a budget turbo LS or a street driven setup, understanding how the fuel system works will save you time, money, and tuning headaches. If you are deciding between a blow through carb or EFI for your LS swap, this video will help you choose the right setup for your goals and avoid the common fuel system issues that end builds early. Subscribe for more LS swap content, turbo builds, and real world garage tips.