As far as my constantly blowing fuse, I'm still not 100% sure what was causing that. When I opened the panel today and inserted the new fuse, everything worked properly. I did re-seat some of the connectors, but that shouldn't have affected anything (maybe things working or not, but not a short). I was also incorrect about the fuse location. It is *NOT* in front of the timer/fuel station circuit, just the gauge.
I believe the fuse blowing was a short because of how the installer did the wiring. It's the only thing out of the ordinary, and I think the end must have come into contact with something grounded.
Umm, Jayco, we need to talk.. That's not how you use those connectors, nor is it the proper connection for this purpose. I taped them up so they can't cause any more problems.
For the fuel station, I called it right yesterday. It was a mis-wiring. Here is a shot of 15 Minute timer module:
If you look carefully, you'll notice that the label says: 1-Trigger, 2-Load, 3-12 VDC, 4-Ground. Unfortunately, the installer didn't wire it that way. He/she attached the blue wire to the 12VDC, and the Red to the load (Fuel Station pump), so there was no way for the module to get power to close the relay.
I removed the timer module, shorted the red/blue together and heard the fuel station for the first time since we got it, so confirmed it worked.
Swapping the blue/red connections was a little complicated because of how they wired things, so I decided to swap them at the connector. I created a small shim out of an aluminum can and was able to push it over the connector conductor to collapse the retaining prongs and pull the wire out. Once the blue/red wires were swapped - voila!. The relay in the timer module now turns on/off as it should with a quiet but audible click. I also went around to the fuel station, pulled the e-stop and verified it works as well.
Now a pet peeve I had to directly deal with while fixing this. I'm constantly amazed that these manufacturers don't seem to understand what type of screw to use for what application. They always use these flat head screws in non-countersunk applications, like so:
That's not the right application for this type of screw. Since it's attaching something flat to the edge of something else, it should be either a round/button-head screw like a short pocket-hole style screws they use everywhere else, they should counter-sink it or they should use a trim washer like this: