If you reverse the polarity on the fuel pump and then crank your motor over
a few times, so that the pump will run, it should open the flow back up for
you.  This will only be a temporary fix if you have lots of sediment in the
tank and I don't know if it hurts the pump to run it backwards?  I did this
a few times on my way to get a new filter a year or two ago and haven't had
any problems with the pump.

Jonathan Poole
'82 AC Westy