Why is the ECU not turning on my fuel pump?
As theCRANKwalker discovered the ECU doesn’t ground the fuel pump relay coil until the ignition is switched to start.
Is there an ECM signal to the fuel pump relay?
The fuel pump relay works as it should. I always have power to Pin 30. I believe the ECM tells the relay to work via the green/black wire to Pin 85. This should happen for 2 seconds when the key is turned on. I have tested this when the issue is occurring and have confirmed that no signal is being sent from the ECM.
Is there no power to the fuel pump?
No power to the fuel pump and the fuel relay is not getti… Q: No power to the fuel pump and the fuel relay is not getting power. My car has 190000 miles.
Why is the fuel pump and relay not working?
The ignition circuit, which includes the ignition switch, controls power to many components, including the fuel pump and relay. If there is an issue with the switch or the circuit, perhaps a wiring problem, then power to the fuel system may be cut off.
As theCRANKwalker discovered the ECU doesn’t ground the fuel pump relay coil until the ignition is switched to start.
The fuel pump relay works as it should. I always have power to Pin 30. I believe the ECM tells the relay to work via the green/black wire to Pin 85. This should happen for 2 seconds when the key is turned on. I have tested this when the issue is occurring and have confirmed that no signal is being sent from the ECM.
Why is my fuel pump relay not working?
Most of the time, if I leave the key in the On position, after several seconds to a few minutes, it will all of the sudden prime and the gauge comes alive. Then it will work for a few days until the next time it randomly doesn’t. I have ruled out the Passkey issue. The fuel pump relay works as it should. I always have power to Pin 30.
Where does the electricity from the fuel pump relay come from?
This is the ground from the electromagnetic coil inside the relay that receives electricity from a switched power source to pin #86.
How can I Turn on my fuel pump?
If you borrow his cable you can set DSMLink to turn the pump on with the key in the ON position, but otherwise it’s only on when starting and running. It should get a 1-2 sec prime from the pump. Most FI cars do that to build up pressure and prevent long cranking starts to build up pressure.
Can a dsmlink turn on a fuel pump?
Didn’t alex already tell you that the key in the ON position does not turn on the pump. If you borrow his cable you can set DSMLink to turn the pump on with the key in the ON position, but otherwise it’s only on when starting and running. It should get a 1-2 sec prime from the pump.
Why does my fuel pump only run for a few seconds?
This sound is the electric fuel pump trying to prime the fuel system. It will only run for a few seconds and then shut off. If you are not sure you could hear it or if there is noise outside; you may have to try it several times. Turn the key on and wait then turn it off.
If you borrow his cable you can set DSMLink to turn the pump on with the key in the ON position, but otherwise it’s only on when starting and running. It should get a 1-2 sec prime from the pump. Most FI cars do that to build up pressure and prevent long cranking starts to build up pressure.
How does an electric fuel pump keep cool?
Electric fuel pumps run continuously with your engine, delivering high-pressure fuel to the fuel rail and injectors. Fuel pumps keep cool by staying submerged in fuel. If you make a habit of running your tank all the way to empty before filling up; your fuel pump will most likely die before its designed lifespan.
What to do if your fuel pump won’t start?
Ugh…..I hate chasing down electrical problems. If jumping the fuel pump relay makes the pump run, and if the relay tests good. Then you need to determine why the ECM is not telling the relay to close. Start by testing continuity back to the ECM.
What was the problem with the fuel pump relay?
Ive just replaced leads, plugs, dizzy cap , rotor , fuel filter, air filter about 1 month ago. He told me to tap the 2 relays under the battery and as i tapped the ECU relay with a screwdriver the motor stalled.
Why does my fuel pump not prime with the key on?
Fuel pump doesn’t prime with key on. I’ve been trying to figure this out for a couple days now. My 01 Tiburon wouldn’t start the other day. It would crank, but wouldn’t fire. When I turn the key to the “on” position, the fuel pump doesn’t kick on.
Use a circuit tester to check all the electrical connections to the fuel pump. Turn the key to ON. If you see a current, then it is not the pump. If there is no current, check the fuse.
Why does my ECU go bad when I jump start my car?
If the voltage is 6 or less, then this is likely causing your ECU problems. Whenever a jump start is performed on your battery, you need to ensure that the jumper cables are attached properly. If you perform a jump start with the cables attached incorrectly, then it could short out your ECU by causing it to spike too quickly.
What causes a fuel pump to malfunction?
Electronic pumps are typically linked to electronic control systems and contain multiple moving parts; because of this increased complexity, these types of pumps are more prone to failure. Any one of several different parts can malfunction and lead to fuel pump problems.
How can you tell if your fuel pump is dead?
Of course, there could be other explanations for your engine’s failure to start besides a failed fuel pump. To confirm that your pump has failed, check the pressure in your fuel lines with a fuel pressure gauge; if it reads zero, then your pump is likely dead.