Why is my tank not filling

I have a coocheer setup, but I’m only using the compressor.

( COOCHEER 150DB Train Horn for Truck, Train Horn Kit Super Loud 120 PSI 12V Air Compressor(0.42L) 4 Trumpet, Train Horn for Car, Trucks Boats SUV Any Vehicle )

And I have the mini outlaw horn blasters horn. The compressor kicks on but does not fill up, I push the button to activate the horn and the solenoid clicks on the horn.

Would this be pressure switch or possibly a leak in the air hose somewhere ?