1994 GMC Safari

Electrical problem
1994 GMC Safari 6 cyl Two Wheel Drive Automatic

I HAVE REPLACED THE FUEL PUMP AND I'M NOT GETTING ANY POWER TO RELAY ALSO REPLACED RELAY. I ALSO CHECKED THE HARNES GOING TO TANK, NO POWER. I WAS TOLD THAT THE OIL PRESSURE SENSOR MAY BE BAD, SO I PUT A NEW ONE ON, NO CHANGE, IS THEIR A FUSE THAT I MAY BE MISSING.