The machine has been giving me trouble since April. For the past few months I had 2 batteries hooked up and it also needed a jump pack. Cranking the starter kills the battery in 30 seconds. It started sluggishly 2 weeks ago but that was the last time. The unit is a 1999. I also can't find any kind of service manual. And the previous owner has jerry rigged a lot of the wiring. Have a wire lead coming from battered to 4 relays then the 8 fuses. Not sure where all those go Then a large lead from battery to starter. Then from the starter to the ignition.
Draining the batteries that fast doesn't sound very good.
One thing i'd like to ensure is working is the fuel cut solenoid, if it's not working, you may not be getting fuel to the injectors. You said you are getting fuel, i'm just wondering if it's enough to open the injectors.
Another thing to look at is that the fuel line is good, including the lift pump. You can even install a hand primer in line to poost the pressure and see if that helps.
As you aren't getting any smoke means you aren't getting fuel into the cylinders, it could be the injector pump or even the injectors.
Depending on the style of injection, you can pull the injectors apart at home and clean/free them up if they are indeed stuck. I can give details if you wanted to tackle that.