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.

 

[80/MALIBU/COUPE]

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

HOPE IM NOT BRINGING UP THE PAST ... BUT ARE YOU RUNNING A STOCK TANK OR THE GN TANK OR DID YOU DO AND BAFFLING LIKE FOAM BLOCKS?

 

[Rt Jam]

Racetronix has a few return style systems but their lowest flow kit is probably more than you need.

Dual In-Tank Pump System, G7X Turbo Buick, G-Body 550LPH (DPFS-G7550): Dual Pump Systems (Complete) | Racetronix

Purchase Dual In-Tank Pump System, G7X Turbo Buick, G-Body 550LPH or shop other Dual Pump Systems (Complete) and Racetronix products from Racetronix.

www.racetronix.biz

I have their dual pump intank in my GM307C Spectra tank.

 

[wskirvin]

HOPE IM NOT BRINGING UP THE PAST ... BUT ARE YOU RUNNING A STOCK TANK OR THE GN TANK OR DID YOU DO AND BAFFLING LIKE FOAM BLOCKS?

i'm using the GN tank and the holley hydramat that came with the pump.

 

[tw9294]

Walbro pump and Corvette regulator to stock tank and sender. Return is plumbed to what used to be the charcoal canister port. That port has a tiny orifice but it can be drilled out once sender is removed from tank.