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I doubt that anyone has flow information from a port. When questioned the mechanics so far have said that the only test is to remove it and check the impeller.
But the EGR return may not be the best place to check the water pump as I would expect it's flow to be dependent on the condition of the cooler. The heater supply line may be a better indicator of the water pumps output.
Former Vehicle Test Manager, Friction Products.
03 F350SC 4x4 6.0 Auto 5/30/03
Truck Modifications below in Pictorials on Facebook. Search in Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.