i have never heard of a ' Robust Fuel System
i thought all systems were' Evaporative Emission System
something my friends have learned the hard way, Don't but a cheap fuel pump or you will be replacing it again in a year
easy way to get to the fuel pump is to tilt the bed side ways like a side dump truck
unbolt the bed, put some padding between the bumper n the bed, also between the cab n bed
have a saw n some length of 2 x 4 ready
left the bed on the drivers side of the truck when you get it high enough cut the 2 x 4 to length needed to put between the bed n the ground to hold it there