Firstly, where is it leaking from? If its from the gasket seals around the water pump body, you can use rtv sealant to re-seal the water pump.
However, if it leaks from the pulley bearing, I'm afraid you will have to change the entire pump.
i have force my induction turbo up to 1 bar. not long, my car seems to have a problem. the boost still at 1 bar but my car can't go up to 140km also with black smoke on the back. after checked i found out that my...