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Fuel Pump Fuse

fuel pump fuse

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#1 t3stin

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Posted 17 March 2014 - 11:53 AM

Last year the fuel pump fuse on my Mk1 focus would blow every so often, a simple change of the fuse and everything was fine. The fuse is now blowing more and more frequently and even when replacing the fuse if i try to start it back up immediately it just blows that fuse - I have to leave it at least 30 minutes before changing the fuse and starting her up and all is fine.

 

Obviously this is hugely inconvenient and I have read many of the topics on this subject but to be clear is a new fuel pump my only option?

 

Thanks



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#2 Nighthawk

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Posted 17 March 2014 - 12:44 PM

A fuse blows for a reason and simply replacing it every time is not a fix because one time it may not be the fuse that blows but the pump. The fuse should only be replaced once the fault has been found especially with being used with highly flammable liquid.

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#3 t3stin

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Posted 17 March 2014 - 02:22 PM

So are you saying it is the pump that needs replacing or where would I begin with finding the true fault?



#4 MiltyG565

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Posted 17 March 2014 - 02:29 PM

The fuse is there to regulate the draw on power. If it rises above a certain point, the fuse blows. It's a simple way to protect expensive components like fuel pumps. However, the fact that it's blowing so often would suggest that it's trying to draw more power than Ford say it requires. Why is that? Is it partially seized? You'll have to have a look to find out. Is it diesel or petrol?



#5 t3stin

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Posted 17 March 2014 - 02:40 PM

It's petrol - wouldn't have the first clue where to look so any pointers appreciated?



#6 MiltyG565

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Posted 17 March 2014 - 02:53 PM

It's petrol - wouldn't have the first clue where to look so any pointers appreciated?

 

Sorry buddy, I don't know that much about them. But if you tell me your model, I can try and find something out for you from the Haynes manual.



#7 t3stin

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Posted 17 March 2014 - 03:17 PM

it's a 2001 1.6 LX

 

I'm aware there was a recall on them briefly but assume this was never done.



#8 JW1982

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Posted 17 March 2014 - 03:50 PM

Your fuel pump is located in the fuel tank. To change the fuel pump it is necessary to remove the fuel tank.

Your problem is most likely caused by a defective fuel pump. You could first check the wiring for any damaged insulation or punctures. If the wiring is in good condition your only option is to install a new fuel pump.

#9 t3stin

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Posted 17 March 2014 - 03:54 PM

stupid question but where do i look for the wiring? 



#10 MiltyG565

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Posted 17 March 2014 - 03:56 PM

stupid question but where do i look for the wiring? 

 

 

The wiring for the fuel pump, or the wiring schematic? 



#11 t3stin

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Posted 17 March 2014 - 04:06 PM

 

Your problem is most likely caused by a defective fuel pump. You could first check the wiring for any damaged insulation or punctures. If the wiring is in good condition your only option is to install a new fuel pump. 

 

The wiring referred to by the above



#12 JW1982

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Posted 17 March 2014 - 04:20 PM

The fuel pump wiring should be under the rear seat. The wiring loom is routed through a rubber grommet to the fuel tank and connected to the fuel pump/tank sender assembly.

I have seen a few times that the rubber grommet was damaged. This caused the wiring loom to rub against sharp edges and resulted in damage of the wiring insulation.

#13 MiltyG565

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Posted 17 March 2014 - 04:22 PM

Sorry, I have no idea where the wiring for the fuel pump is.

 

Looking at a schematic for a Zetec SE 1999 Focus, the only component between the fuse box and the pump is an inertia switch. I have no idea what it does, but it might be worth having a look at that. Although it looks like a simple switch, so I'd be surprised if that was the issue. Is it Fuse F12 that keeps blowing?



#14 MiltyG565

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Posted 17 March 2014 - 04:23 PM

The fuel pump wiring should be under the rear seat. The wiring loom is routed through a rubber grommet to the fuel tank and connected to the fuel pump/tank sender assembly.

I have seen a few times that the rubber grommet was damaged. This caused the wiring loom to rub against sharp edges and resulted in damage of the wiring insulation.

 

My next guess was a short circuit, so that's possibly what it is.



#15 t3stin

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Posted 17 March 2014 - 04:43 PM

Thanks guys, may not be able to look into this until the weekend but appreciate the input!



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