Review on Amarine Made 12v Water Pressure Diaphragm Pump: High-flow, Versatile for Caravan/RV/Boat/Marine Applications by Keith Maynard

I bought this pump on February 10, 2016 Unfortunately I wasn't able to install it on my water system until April 10, 2016. Immediately after installation the pump ran constantly, I first checked the system for leaks but couldn't find any so I shut off the pump outlet and checked again and it was still running so I'm pretty sure it's either the check valve or the pressure Switch is defective. . My problem is that I am currently in Canada, what should I do?