spark1
The smaller the diameter of the hose, the greater is the pump pressure required.
Also, the longer the length of hose, the greater is the pump pressure required.
It could be that your pump pressure is too low for the diameter/length of hose, or that you have too long a length of hose for a 60psi Shurflo pump.
I have a 100psi Shurflo pump pushing water though 2 Di bottles and then 50 metres of 5 mm pole hose and it works OK. When I tried it with 80 metres of 5 mm pole hose, the internal resistance of the hose caused the pump pressure switch to kick in and the pump stopped working. I assume that, in my set up, at hose lengths between 50 and 80 metres, the water flow rate at the brush head would get progressively less and less as resistance increased, until it eventually stopped.
Also, Shurflo make lots of pumps – with different flow rates for the same pressure rating (and different pressure ratings for the same flow rate).
Look up ‘Williamson pumps’ on Google and then speak to someone from the company.
Mike