The fuel pump on a 1994 Chevy Camaro is located in the fuel tank. It is mounted in tandem with the fuel level sending unit. The '94 Camaro fuel pump receives its power through an electromagnetic switch, called a relay, located in the fuse/relay box situated on the front driver-side fender well. The computer (the engine control module or ECM) actuates the relay for two seconds unless it senses an engine start and increase in rpm. If it does not sense an engine start and increase in rpm, the computer breaks the connection after two seconds, thus shutting the fuel pump off. This is a safety precaution to prevent the fuel pump from pumping fuel into an engine that is off or not working properly.
Check the fuel pump fuse in the fuse/relay box by taking the cover off and examining the diagram under the cover. Locate the fuse and the relay for the fuel pump. Check and replace the fuse if it is blown and try to start the vehicle. If the fuse was blown and replaced but the Camaro still will not start, proceed to the next step.
Remove the air duct between the air cleaner element and the throttle body, using a screwdriver to loosen the clamps. Open the throttle body by pushing the throttle linkage on the side of the throttle body. Spray a one-second squirt of carburetor cleaner into the throttle body. Close the valve and attempt to start the vehicle. If it starts for a few seconds, the fuel pump or the fuel pump relay is bad.
Locate the fuel pump relay and pull it out. Notice that the relay has four legs. There are four female terminals in the relay box. Use the voltmeter, with its black lead connected to a good ground and the red lead as a probe. There should be one terminal with battery power with the key off when probing the terminals. Employ a helper for this next test. Have a helper cycle the ignition key on and off every few seconds while you probe the remaining three terminals for power. The circuit is good if there is power present (as shown on the voltmeter) when cycling the key.
Connect the two jumper wires to the battery terminals--one on the positive terminal and one on the negative terminal. Make sure to keep these wires from touching each other. Connect the red positive jumper to a leg of the relay, and touch the opposite leg with the black ground wire. The relay should click audibly if it works. If you do not hear a click, switch to the next two terminal legs. If you do not hear a click, replace the relay. If the fuel pump still malfunctions, replace the fuel pump.
