If the vehicle runs & drives fine the primary fuel pump is fine, but the secondary fuel pump could be bad.
One of the fuel level sensors could be bad too causing the gauge to give a false reading.
Yes, the Equinox does in fact have two fuel modules and each has it's own fuel level sensor. The two modules are necessary due to the "saddle" design of the fuel tank which splits the tank into two portions or "reservoirs". The primary module is on the right side of the tank and contains a primary and secondary fuel pump. The primary fuel pump supplies the engine with fuel; the secondary pump pumps fuel to the "primary" (right) side of the tank via a cross tube. The secondary module is on the left and does not have a fuel pump in it. The fuel level sensors are available as a separate part on the Equinox unlike most other older GM models where it was only sold with the entire fuel pump/module assembly.
There is no access panel so the fuel tank does need to be removed to replace them.
Last edited by ruley73; 05-26-2011 at 06:17 PM.