I have a 97 Blazer 4.3L that will not start. I checked the pump plug and got no power with the key on. No power at the relay when the key is turned on. I even disconnected the oil pressure switch to bypass the switch. Still no go. I have batt power at the relay but no ignition key power. When I manually actuated the relay the pump came on. I'm leaning torward the computer. Please help me and let me know if I'm correct or not. Also fuse is good. Thanks.