3. Run a dedicated wire from your battery to pin 30 on the relay. 4. Run a wire from pin 87 to your factory wire that you cut that runs to the fuel pump. Now to explain what you just did. The relay is just like a light switch. Anytime it receives 12 volts on pin 85, it will turn on the switch and make continuity between pin 30 and pin 87 on the.. The other two wires are for dash gage. The coil side of relay, dark green wire with white tracer is voltage from computer. Black wire is constant ground. Fuel Pump Relay Wiring Diagram (Automatic Trans. Only) NOTE: The illlustrations and info in this page apply only to Chevrolet/GMC pickups with a L, L or a L engine.
![1991 gmc 4.3 fuel pump relay wiring diagram [diagram] 94](https://blogger.googleusercontent.com/img/proxy/AVvXsEhtBWLn-9atlfvihrWciRHPQuemQJFauNYMYjyVxfU7e8vh2HE6ZyF5gP8W0brQzlMk4bQT-NmOcF9C4sAD5pdB8O7qT47CtkVZD6ijpPXluGiAl_wngzyjzh4CM_uxyIScvuvHvGelD2OTIVwvAg1f4JYE8bwFZEKej9jCmZKEFw=w1200-h630-p-k-no-nu "1991 gmc 4.3 fuel pump relay wiring diagram [diagram] 94 gmc fuel pump")
Here is a schematic for a 1999-2006 GM and Chevy fuel pump relay, which is also common for other years and vehicles. To jumper the fuel pump relay, use a jumper wire from Pin 30 to Pin 87.. NOTE: The illustrations and info in this page apply only to 1994 Chevrolet/GMC pickups with a 4.3L, 5.0L or a 5.7L engine. For the 1993 fuel pump wiring diagram, check out the following article: