Eas not lifting

I've got a 1995 4.0 se that I bought to break but I've just sold it as a complete car. When I got it the eas was fine. Drove it a few miles and has a sudden pop and rush of air. Eas stayed up all round and was fine for the next few hours untill parked up. Then when I came to run it again it wouldn't lift. The pump is running but it won't put any air into the bags. Any ideas?

Connection to the receiver tank blown? Look at the Violet coded pipe from the valve block that is the tank feed. Or NRV 1 totally failed and compressor weak.