Coyote, thanks for all the tips. They'll come in handy next time. I will make sure and check the hydro fluid after running next time I'm down there.
I didn't see a valve to stop the fuel flow to the secondary fuel filter. I've learned now that there are a number of tools made to clamp off fuel and other lines when needed. One looks like a pair of vice grips with rounded jaws that won't damage the hose. Harbor Freight has them for $15.
The leak was at the fitting I saw on Friday. It took a 22mm crowfoot, 12 inch extension, and a breaker bar to tighten it another 1/2 turn or so. No more leak! I'll try to remember to get a picture of it next weekend when I'm down there again.