aux diesil tank transfer pump?

Last year I had a custom made aluminum fuel tank fabricated to hold 15 gallons of fuel (diesel) which is upright and fits up against the front of the bed. I already had toolbox mounted in the bed of the truck which had to moved back 4" in order to mount the new fuel tank. The filler neck is the only thing that sticks up above the bed rail. There is also a rollover vent installed in the top of the tank and a fitting for a manual shutoff valve at the bottom. The 3/8" tubing goes into a fitting that is placed in the truck's filler neck line. My original thought was to use this setup as gravity feed but found it to be really slow. I have since installed a 12vdc fuel pump (Facet model 40131E) in line. This little pump will pump 1 gallon of fuel in 2 minutes. I have mounted a lighted rocker switch on the dash which is connected to the ignition on line. After fabrication and prior to installation I brought the tank to the place that coated the bed of my truck when I purchase it, so the tank is now coated also. I could post photos if necessary.