Land Rover Repair: 1994 Range Rover stalls, fuel pump relay, rovers north

Question
1994 Range Rover start fine bot after being drven 15 to 20 miles it stalls.  After sitting for 10 minutes it will start but will only run for a couple of miles and stall again.  It takes longer to start and will only run for about a mile before stalling again. I have replaced the fuel pump relay, the mass air dlow sensor even the gas cap.

Answer
The printed factory  workshop manual for the early Range Rover has a step by step troubleshooting process for the fuel injection that tests every single component.  I am sure following that procedure will lead to an answer.  The great thing about trucks the age of yours is that no special computer tools are needed.  You can do all the tests with a good Fluke-type multimeter.  The workshop manual can be bought from Atlantic British, Rovers North, and others.