1.24 Fiesta-09 on. - Earthing.

Honest John Back Room » Technical matters
What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
View Threaded
Mon 8 Jun 2015 18:40
1.24 Fiesta-09 on. - Earthing. - jc2

How are the fuel pump and fuel gauge sender earthed and if it is separate earth point,where is it?

Reply | Report as offensive | Link
Mon 8 Jun 2015 18:52
1.24 Fiesta-09 on. - Earthing. - old-school-tech

I would assume as most vehicles are the earth will be via the wiring loom into the fuel sender unit.

Very few vehicles have seperate earth points for individual components thesedays.

Reply | Report as offensive | Link
Mon 8 Jun 2015 19:49
1.24 Fiesta-09 on. - Earthing. - elekie&a/c doctor

The fuel pump will be earthed to the chassis/frame at some point.The fuel gauge sender unit does not have an earth.

Reply | Report as offensive | Link
Thu 11 Jun 2015 09:35
1.24 Fiesta-09 on. - Earthing. - jc2

Is the tank plastic or plastic coated metal?The sender must have an earth-presumably common with pump as there is only one wire to the sender.

Reply | Report as offensive | Link
Thu 11 Jun 2015 19:45
1.24 Fiesta-09 on. - Earthing. - elekie&a/c doctor

The tank is plastic.The fuel pump and sender can't work together through 1 wire.What problem do you have with the car??

Reply | Report as offensive | Link
Thu 11 Jun 2015 20:11
1.24 Fiesta-09 on. - Earthing. - jc2

I never said they did but I believe they share a common earth;the problem is an intermittent shut down of the engine caused by the pump stopping and I have noticed that when this happens,the fuel gauge goes to zero-this leads me to believe that a bad earth causes both to fail.

Reply | Report as offensive | Link
Thu 11 Jun 2015 20:23
1.24 Fiesta-09 on. - Earthing. - elekie&a/c doctor

In common with many modern cars,the fuel tank sender has no earth to it .Both wires from the level sensor go back to the instrument cluster.

Reply | Report as offensive | Link