05 JEEP TECH QUESTION

If you can't learn to deal at least with the basics of electricity you are likely wasting your time--and money. What I'd do based on what you said
1...Buy or borrow a scanner and see if you can find some errors. Some of the parts stores loan or rent scanners
2....Round up some documentation, see if you can find a manual on line. There are several off road/ Jeep forums, but I don't know where to point you
3...Consider buying a relay socket pigtail that fits the pump relay, then get some male spade/ flag connector terminals, and terminate the relay pigtail wires so you can plug them into where the relay "came out of." This will allow you to probe the relay socket easily and determine if the relay coil is getting grounded (if it is switched,) if the relay coil is getting power, and if the contacts are sending power at least "towards" the pump. You can also jumper "around" the relay contacts to try and activate the pump.

Not knowing the connectors under the Jeep or downstream in the harness, it could be a loose/ intermittent/ bad connector, etc

The chances of more than one relay or pump failing is zero. I suppose it could happen, but the chances are very very slim.