I've got an Alliance challenger set up for rescue and was thinking of joining the fuel rats.
looks like I'll have to go CQC /c: <shudders>
I used to Fuel Rat... got 25 confirmed rescues. Makes you feel good to help others.
But that was before the galaxy map showed "fuel star" on your plotted course. And it was also before the starter zone. I feel like both of those changes have probably affected the number of calls the Rats get.
Even back then, as a Rat, I would spend hours sitting outside a station somewhere and watching an IRC chat screen waiting for a chance to go on a rescue. Once the dispatcher got the location of the person needing help, all the rats would plot courses to that location and report how many jumps away they were. The dispatcher would tell the two closest Rats (by number of jumps) to go and the race was on. On the way to the rescue, the person needing help would send friend requests to the two Rats and you'd all get in a wing together. Getting there first didn't always mean you'd be the one to complete the rescue, though. We all know how fickle the instancing system is in elite. On one occasion, after several failed attempts to drop from supercruise to the person needing help, I had to get them to go to supercruise and drop on me when I dropped before we finally ended up together (luckily they still had enough fuel to do that).
If you decide to join the Rats, you'll want a really big jump range. Today I would probably use a Diamondback Explorer (since I have one with a 74LY range), no shields, no weapons, A-FSD level 5 range engineered w/deep cycle, Guardian FSD booster, 4A fuel scoop, 1A limpet controller, 2E cargo rack, 3A power plant (lighter than a 4D), and D-level: thrusters, life support, and sensors. I'd wait until I got to the person before synthesising the limpets (synthesizing makes 4) just to stretch that range as far as possible.
You'll still spend a good deal of time sitting and waiting for a call though. You might want to have something else to entertain yourself while you wait.
But yeah... it's still worth it.