low voltage to fuel pump on 1993 GMC Vandura 2500

i replaced fuel pump and relay ran good for about a month quit again checked voltage to[ pump 9.5v ]battery is reading 12.5 . fuse is ok help

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
Voltage seems low; check for fuel pressure, though, and see how much you have.