I recently changed the waterpump on my 99 F350 with the 7.3 and I would like to know how much coolant it can hold? Also my water pump is leaking because I don't think it is sitting on the gasket right. Do you have any ideas that will help it go on right so I dont have to take it off again?

thanks

 

Don't know the official data, but I just changed my coolant to lifetime one (blue stuff) changing the thermostat to 203 and adding filter on its way.
After draining from the radiator plug and it took approximately 5-6 gallons.

 

Clean the mating surfaces well, put some sealant and torque the bolts down tight? Do check the flatness of the mating surface with a flat edge