the truck has 2 relays a green one and a brown one. the brown one works fine because you can hear it click. the green one i took off and got a new one because the fuel pumps wouldnt turn on. once i got the new relay the pumps wouldnt turn on. then i just connected a wire directly where the relays at and got the fuel pumps to run. but when i put the relay on they dont turn on. also when it runs the truck runs to rich and i want to know if a relay can make a truck run to rich and why when i put the relay on the pumps wont turn on. can anybody help me please
Pump relay only close when engine is cranking(for safety purpose,if the vehicle engine stops,fuel pump also stops)Relay only makes the pump runs,nothing to do with fuel mixture.
The relay is turned on by the computer it grounds the circuit.If you have power at two of the terminals with the key on and you can jumper the relay and get the fuel pump to work then the ECM is done