I've always heard that the servicing or repair of diesel injector pumps is best left to professional specialist shops because of the extreme high pressures at which these pumps operate.
This is also why the cleanliness of your diesel fuel is so important. The fuel system on the engine is...
To stop a run-away diesel, it is my understanding you've got to stop the air flow into the engine by blocking the air intake -- with something other than your hand! I haven't experienced this situation, personally...
With those porsche lifting bars, they are lifting one side of the vehicle with a single jack in the center, and you can see the bar flex (note that with no load, the bars appear to be designed with a dip in them to accommodate that flexure).
In your case, using your 53" lift under the 77" bars...