Ya to nozzle choke hai ya pipe choke ho gaya hai.. Pipe replace kerdo.. Or agar nozzle choke hai to nozzle nikal ker us mein harpic k 2,3 drops daal do for 5 mins.. Us k baad pipe connect kero 1st end per or 2nd end per syringe connect kero, pour some water in syringe and press it for pressure.. Hopefully nozzle will clear.. If not then repeat the whole procedure now put more drops of harpic for 5 to 7 minutes..
Or may b possible k motor chal rahi ho but pressure develop an ker rahi ho, in this case u have to replace bottle with motor..
Regards..