Has it got fresh fuel in it? And enough of it? The pumps usually go noisy when they are pumping air opposed to fuel!

If you took the fuel pump out the equation, it will be the Jetronic setup. Warm up regulator or Metering head will be the obvious culprits - they are probably gunked up and/or corroded to buggery internally depending how it was all left. The fact it runs for 10mins from cold I'd be looking at fuel pressure first and foremost. Then that will identify if its crashing out, in which case start at the WUR