Fish... It's been a couple of years since I did this, and I must say I'm no expert, I've only done mine. First, I have to wrap my head around the idea that for me with the Bobcat, many things can just barely be done because of tight fits and lack of room/visibility. I talked to some Bobcat techs and read this forum before I tried it, and it seemed to go OK for me. I have a 1999 863G, maybe yours is different. Yes, the fittings are right below the hydraulic pump, but it was still accessible enough. I might have used a very small screwdriver-sized pry bar to get the fitting and then the rubber grommet out (careful of the tank, it's only plastic), I don't remember. I do remember that the elbow fitting was not as tight in the grommet as I wanted, and the grommet was not as tight in the tank hole as I wanted. Never could figure out how to tighten 'em up, so when the tank's full, it does seep a bit of diesel there. Tnx to mmslic's post -- I forgot that the filter had a check valve. Also, when my pickup tube broke off, the machine of course was on a slope and just died abruptly. Fortunately, the filler line was on the uphill side. I filled it with diesel clear up into the fill tube and it started and ran fine. So I managed to drive it to my shop by shutting it off every few hundred yards and adding a cup of diesel to keep the level up near the fill cap. Last tip: connect the new fuel line to the elbow fitting before you reinstall the fitting. Otherwise it's nearly impossible to put a clamp on that line. As mmslic said, don't ask me how I know this.... Best of luck, and think positive. Once you get this done, you'll have bragging rights....
---Bobbie G