One other thing to consider when looking for the leak is the o-ring on the pressure hose at the pump. Mine got all buggered up and was leaking. I thought it was the pump due to lack of troubleshooting on my part, so I changed the pump. The new pump I bought was just that a pump without the resavour, what a pain to remove the old one and install it on the new pump.
Check that o-ring if you get a chance.