12 Volt vacuum pump problem

some good ideas, I will check to see what electric motor power draw, the rated amount of vacuum is rated at 18-22 inches for the pump, the way I have this plumbed is from something I found on the enter net, they showed 2 ways to plumb this up on 2 G-M cars and had not problem , far as the fuse I have it mount inside the car near the fuse box so heat from the engine compartment would not effect it. this pump is a diaphrame type not a squirrel cage type