I have a normal domestic type pressure washer, and at certain times of
the day, the pressure just stops and starts every few seconds. I am
told this is because I must have low water pressure or flow.

So without installing a new mains water pipe, what can I do to get over
it.

Can I somehow fill a tank up with water, and will the pressure washer
suck it up, or must it have a head of water, ie put the tank on a
stand.

Any ideas please.