Three gallons should be enough. Pump the primer pump until you get resistance. Then loosen the nuts at the injectors. Crank for up to 30 seconds while watching for fuel coming from the loosened injector nuts. A helper is nice, but you can do this yourself watching through the gap from the opened hood. If you don't get fuel within thirty seconds, stop and let the starter cool for two minutes. Repeat as needed, and use a charger to keep the battery up. You'll start to see fuel at the injectors after a while. A little spurt here and there you just let go. Once it's spurting fuel on every other crankshaft revolution, it's bled. Tighten that injector nut and continue with the others. The most likely outcome is that the engine will start with about three injectors. Let it start, then tighten the remaining injector nuts (quickly!), then shut down. I've had to do this on HMMWV's (which don't have a primer pump) many many times.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.