drain the fluid and see if sometyhing is not blocking the inlet hole.the reason i say to stop is that i think the fluid is used to lubricate the pump while it's being pumped through.it's also possible that you have a blockage at either end of the line.

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)