Performance car owners want fuel economy and throttle response. That's why they upgrade to the EZ-EFI fuel pump conversion for mpg improvement. FAST has the relay harnesses to compliment this system. These plug-and-play harnesses are simple to install, and they'll hook you up to the precise amount of fuel for optimal performance.

More From This Category

FAST Analog Input Harness for XFI

FAST Analog Input Harness for XFI

$92.85

FAST Electric Fan and Fuel Pump Connector Kit for XFI

FAST Electric Fan and Fuel Pump Connector Kit for XFI

$25.84

Proflow Fuel Injector Wiring Plug EV1 Bosch Style 2 Pin Include Terminals & Boot

Proflow Fuel Injector Wiring Plug EV1 Bosch Style 2 Pin Include Terminals & Boot

$4.39

Haltech Fuel Injector Adapter - 10.5mm Nissan RB26DETT GTR

Haltech Fuel Injector Adapter - 10.5mm Nissan RB26DETT GTR

$12.00

FAST XFI Fuel Inector Harness for 4 Cylinder Engines w/ Minitimer Connector Injectors

FAST XFI Fuel Inector Harness for 4 Cylinder Engines w/ Minitimer Connector Injectors

$209.55