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Ironmike
Ironmike, Ford Technician
Category: Ford
Satisfied Customers: 3301
Experience:  30 years ASE Master tech L1 . Ford master
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Ford Focus: Three times in the past two months the F9 fuse

Customer Question

Three times in the past two months the F9 fuse (fuel pump) on 2000 Focus has blown when car going uphill and turning right. Any suggestions about where the short might be?
Submitted: 1 year ago.
Category: Ford
Expert:  Ironmike replied 1 year ago.

greetings,

There is a good chance the fuel pump is failing. Let me know what the pump sounds like. You may be running the pump dry as the fuel sloshes away from the fuel pump. You may even have something loose in the tank causing this when the vehicle goes up hill RT. Not uncommon for a focus to need a fuel pump assembly at 120K, you actually did good to last this long.

I am not saying it could not be a wire shorting to ground in the harness but the pump failing is much more common. Make sure you change the fuel filter too

there was a recall that extended the coverage for the fuel pump for 10 years

lets start here

good luck

Customer: replied 1 year ago.
Hi Ironmike,

When the car has died, it has been instantaneous, like a light switch was flipped from on to off. There was no warning at all that anything was wrong, and then suddenly the car was no longer on and the F9 fuse blown. Would a faulty fuel pump assembly do something like this?

Thanks,

Roberta
Expert:  Ironmike replied 1 year ago.
Let me go over the schematics again.
Customer: replied 1 year ago.
Hi Ironmike,

Thanks for looking over the schematics. I'm hopeful that my car will be running reliably again soon.

Roberta
Expert:  Ironmike replied 1 year ago.

The fuel pump and the fuel pump relay are both on f9. I would expect the vehicle to lose power/hesitate if the fuel pump quit. since you said it is more like shutting off we need to consider what else is on the circuit.

The MAF sensor and both 02 sensors are on this fuse also. If the fuel pump draws to much it could blow the fuse which would shut down the MAF, that could cause a stall like the vehicle was shut off. You could make sure the MAF sensor and 02 sensor harness show no signs of rubbing. Lets make sure there are no possible shorts on these 3 components.

good luck

Ironmike, Ford Technician
Category: Ford
Satisfied Customers: 3301
Experience: 30 years ASE Master tech L1 . Ford master
Ironmike and 12 other Ford Specialists are ready to help you
Customer: replied 1 year ago.
Thanks, Ironmike!
Expert:  Ironmike replied 1 year ago.
thank you and keep me posted

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