i agree with alan, #49.
yes, clogged input screen is common.
you really need to do the fuel flow test.
you remove the return from the FD and measure the amount of fuel OUT of the FD. i think its for 30sec.
then do the same for the line to the WUR. that one i think is a min.
a clogged sys
PR
like i said. if your sys
PR is working at all and your return is clear then your pressure should be some what less than it is before the FD.
if you connect your gauges to the port on the FD for the CSV you can check sys pres there too.