The transmission issues might just be that the bowden cable needs adjustment. Possible free fix there. As far as fuel, it's possible to run the car from a fuel canister under the hood. The fuel pump is sort of built into the injection pump and it sucks it all the way from the fuel tank at the back of the car to the injection pump, so it's no problem from a can under the hood. Just buy some fuel hose and run it from can to prefilter, then run the return line into the can also. Oh, make sure your trans and oil cooler lines aren't leaking so the engine or trans don't get killed. Also check coolant hoses for mushyness. You'll kill the car fast if you pop a hose and don't shut down almost immediately.

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped