I'm not sure which one of the fuses in the DC part of your panel it is either. Does your DC panel have Red LEDs next to the fuses? If so, a Red LED should indicate that the fuse is blown. If no LED, you may just have to pull the fuses one at a time and look at them to see if it is blown.
On a side note, I have that same pump...the GPI-8 as a fuel pump for the aux tank on my CrewCab Dually. I've replaced two of the switches already, and the third one was bad. This weekend, I totally removed the switch and jumped the switch wires together. Upstream of that, under the hood of my truck, I installed a very heavy duty relay (200 amp) and then fed a switch leg back to my toolbox in the bed of the truck and will now use that to turn on the heavy duty relay that is under the hood. The relay coil only pulls about 400 milliamps, so 16 ga wire for the switch leg circuit is plenty big and a 5 or 6 amp switch mounted inside the tool box.
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2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
Excessive payload capacity is a wonderful thing
"If it ain't Fast....It ain't Fun"
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