What are you guys doing for fuel systems on your efi LS conversions?

[gnvair]

This is the one i am using. It went right into the stock location, hooked up the fuel gauge wire, grounded it and supplied it 12v from the relay block I installed.

Holley Sniper EFI 12-306 Holley EFI Fuel Tank Modules - 255 LPH - GM G-Body Vehicles

This in-tank fuel pump module is a high-pressure unit that flows 255 liters per hour (LPH) and is capable of supporting electronic fuel injection (EFI) engines producing up to 550 horsepower. Featuring a pre-calibrated fuel-level sending unit designed to work with the factory fuel gauge for this...

www.holley.com

It looks like the Buick GN sending unit. The Buicks have a 3 wire connector. What's the 4th wire on the holley for?

 

[wskirvin]

It looks like the Buick GN sending unit. The Buicks have a 3 wire connector. What's the 4th wire on the holley for?

gray is 12v from the fuel pump relay, purple is for the fuel gauge, solid black runs to the negative side of the battery and then the black with white stripe grounds to the body back by the tank.

 

[gnvair]

gray is 12v from the fuel pump relay, purple is for the fuel gauge, solid black runs to the negative side of the battery and then the black with white stripe grounds to the body back by the tank.

It sounds like they added a second ground wire. Thanks for the info.