Well.... I went over armed with a fresh battery as I was unable to start it yesterday even with using the e53 and jumpers. Installed the battery and bingo she started up but quit 5 seconds later. Did a restart same result. It didn’t stall but rather shut off. I could hear the lock pin for the shifter each time it quit. Hooked up my scanner and ran a body scan found multiple codes in each module. My scanner shows battery voltage and I noticed it was at 11.38V ingnition on and when it would run for the 5 seconds no real change in voltage. I hooked up the jumpers to the e53 and checked voltage on the scanner and got 12.43V e53 running. It would appear no real voltage is getting through the battery to the modules. Faulty battery distribution block? Or? I didn’t bring a volt meter... owner mentioned it would do that even before the battery and just put it up to low fuel. I dumped in a full large jerry can in before moving forward with above. But as mentioned it’s not running out of fuel but rather ignition is getting cut.