Eas problems !!!

Compresser stopped compressing replaced the Teflon piston seal works well but keeps running for about 10mins to fill from empty stops for about 20sec then starts again and so on by this time it is very hot (cannot bare your hand on it)
Have replaced all the O rings in the valve block, it would not stay up after that stripped it all down to check I had not miss placed any thing, all seemed ok replaced block back and tried again to my supries the back stays up but the front over about an hour drop DOWN
Can any one help as my wife is !!!

You've got a leak somewhere. Check airbags, airlines and valve block. Compressor is restarting as its having to refill the system all the time (as you're losing air). This would be why the seals on your pump needed replacing. Find the leak or the pump will fail again.

As keywill said there is a leak, probably one or both airbags at the front.