fuel pump stays on when ignition partially turned. after a while pump quiets and will start. this a relay ECM or pump?
Jul 17, 2021 at 7:32 AM
engine problems
1991 FORD EXPLORER
ZEIK1154
- MEMBER
- 26 POSTS
Advertisement
Hello,
It is normal for the fuel pump to prime when you turn the key and get quiet, this is to make sure that you have enough fuel pressure to start the vehicle properly.
Can you tell us the issue you are having?
https://www.2carpros.com/articles/how-a-car-computer-works-pcm-ecm-bcm
https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump
Thank you.
It is normal for the fuel pump to prime when you turn the key and get quiet, this is to make sure that you have enough fuel pressure to start the vehicle properly.
Can you tell us the issue you are having?
https://www.2carpros.com/articles/how-a-car-computer-works-pcm-ecm-bcm
https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump
Thank you.
Jul 17, 2021 at 10:04 AM
what is my problem?
Jul 24, 2021 at 3:38 AM
Good morning,
The pump should only run for 2 seconds with the key on. Then it should shut off until you crank the engine. Then it will run 100% of the time.
By staying running all the time, you need either a relay, which may be stuck or the ECM
itself.
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
The ECM is behind the right side kick panel by the right front door.
Roy
The pump should only run for 2 seconds with the key on. Then it should shut off until you crank the engine. Then it will run 100% of the time.
By staying running all the time, you need either a relay, which may be stuck or the ECM
itself.
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
The ECM is behind the right side kick panel by the right front door.
Roy
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Click here to log in and view diagram.
Jul 25, 2021 at 11:27 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.