Was using our pressure washer today & it started behaving as if it was running out of water - a sort of vibration in the flow - and reduced pressure.
If you released the trigger it seemed to build back to normal pressure almost immediately, & would seem OK for maybe 30 seconds before gradually dying again.
Sometimes this can happen if you're drawing out of a trough etc, and the filter on the pipe's blocked - but all was clear.
Any ideas? - is it terminal? It's about 10 years old, but doesn't do a huge amount of work, maybe an hour a week on average.