mk1 gti cab starting issues

i have a D reg gti with a dx engine in the car and for some reason it will not start im getting the fuel pump priming and getting fuel to the metering head but not to the injectors ive injected petrol in through the spark plug holes the car will briefly fire

i have been playing about with the air box today and moved the diafram plunger up and down and got fuel coming out so i did this while trying to start the car and it fired up and ran for 2 mins at idle no problem the coughed and spluttered and cut out but i cant get it to start again now any suggestions would be great guys thanks

check the adjustment of the flap, it should be level with the narrowest point of the bowl. there is a clip underneath that adjusts this. also check the operation of the 5th injector, take it off the inlet and point it into a container, when you crank it over stone cold it should spray fuel