DSX AUXILIARY FUEL PUMP KIT FOR 2016+ CTS-V E85 The bucket assembly itself does

The bucket assembly itself does not have a check valve

and the latest addition to the X-Series

It is recommended to have a low level of fuel in the tank before installation

gravity filling doesn't do much

DSX AUXILIARY FUEL PUMP KIT FOR 2016+ CTS-V E85 The bucket assembly itself doesThe DSX Tuning Aux Pump Kit is the original and budget friendly alternative to big fuel supply with a simple installation. There's no need to get inside of the factory fuel tank, as this system taps into the tank and uses an external pump that ties back into the factory feed line. With the help of the factory fuel pressure control module, the ECM always knows what your fuel pressure is even when the aux pump kicks on to give a huge boost in pressure