My BMW R1200RT WILL TURN OVER AND RUNS FOR ABOUT 30 SECONDS THEN SLOWLY DIES LIKE IT IS STARVED OF FUEL; IF YOU TWIST THE THROTTEL IT REVS UP THEN DIES STRAIGHT AWAY. Is it muck in the fuel line or is it somthing more serious.

Initial carb setting is 1 full turn out on both low and high side and retry. If no difference, then turn the low side out and additional 1/4 to 1/2 turn CCW. If that makes no difference, then it's time for a carburetor rebuild.

Check your fuel pump.
have someone turn the key on not starting
and listen for your fuel pump coming on.

pickup in tank sounds like it has a hole in it halfway down

check TDI crank sensor. It might be missing pulses due to some faulty plug or connection.

Ok a quick check. When the engine cuts out and you go for restart it dies within 5 seconds. Next time put the ignition at position 2 (on but not starting) and wait one minute, then start the car. If the engine again runs for 30 seconds before cutting off this tells you its is a fuel problem. If the fuel is supplied slowly it fills the carburettor fuel bowls and when the car starts it quickly uses up these local reservoirs of fuel faster than they can be replenished. When you try to restart immediately there is only a tiny amount of fuel and so it used up almost immediately. By leaving the ignition on 2 for while it gives the pump time to fill the carburettor bowls and this takes a while longer to run down when the engine starts. Just before moving on does the car have a choke OK remove the low tension connection to the coil, basically remove any chance of a spark. Put a big old towel around the carb. Now remove the fuel line at the carburettor and put ignition on 2 to engage the starter pump. Listen to pump operation and look at the rate of fuel being pushed from the disconnected fuel pipe. If the flow is slow check on pump and filters.

Air filter clean?
Air filter port set for summer or winter ?
Check the fuel filter inside the tank to ensure that it is not dirty or hasn't fallen off.

Check that your fuel tank is fully sealed as fuel is pumped through it via exhaust pressure, other wise check the fuel lines/carby aren't blocked. You may also have too much fuel, as it would build up and stall your car in a few seconds. Try a pinch test: start car then pinch the fuel line near the carby, if it revs a fair bit harder then stops- could be to rich, if it doesn't rev any different before it stops it's too lean and needs more fuel.