Ebay GT45 + 5.9 Magnum + E85 blow thru

Calculate the Amperage You Need

Can go here and see its a decent calculator, I'd also see if you can find the amperage that fan pulls too. Sounds like it should be enough. Was looking up the pumps and do you run the check valve? If you are that ups the amp draw. Just to help with your calculations.
Current Draw (40 psi): 9.73 amps no check valve, 10.68 amps with check valve (13.5v)