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Old 04-18-2014, 08:10 PM   #1
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Just wasted 3 hours trying to depressurize the fuel system...

Super easy 60,000 miles maintenance is screwing me hard. I just spent three hours - 1.5 of which was spent idling the engine - trying to depressurize the fuel system in order to replace the fuel filter.

The Haynes manual says to either pull the fuel pump relay fuse (fuse 12) or use the Schrader valve on the fuel rail to bleed it. Seeing as how mine does not have the Schrader valve, I opted for the fuse. I removed the fuse and started the engine. It idled forever. So I revved it for half an hour. No go. Decided I would try starting the engine first, then removing the fuse and realized that the fuse was gone. I then went to Autozone, driving six miles without a fuse.

So... what the heck do I do?


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Old 04-18-2014, 08:19 PM   #2
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Moved to the Technical Chat area


My 01' did the same thing. I just pop the clips off and look the other way so I don't sprayed with fuel. Not that much comes out. I'm pretty sure there is a different fuse or relay to pull that will work better but I can't remember what it was or where.
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Old 04-18-2014, 08:37 PM   #3
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If you'd left it rest for a hour, it will "depressure" by itself. When you disconnect the fuel rail passenger side, it may spit a dribble or so, but hey, the motor is cool and the gas will despense itself, but put a lil towel under it if ya want to when you pull the tube back.
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Old 04-18-2014, 10:21 PM   #4
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It won't run that long with no power to the fuel pump.
So you either pulled the wrong fuse or read the diagram wrong.
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Old 04-18-2014, 10:37 PM   #5
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I read the diagram properly, as far as I could deduce from online fusebox diagrams.

I will try again tomorrow. The Haynes manual made it sound like I would blow up if I tried to do the fuel filter without doing this exactly. Haha.
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Old 04-18-2014, 10:53 PM   #6
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http://www.fordservicecontent.com/Fo.../07focog4e.pdf

Now you have an owners manual.
Fuses are on page 158.
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Old 04-18-2014, 10:55 PM   #7
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What i did when I had to replace the fuel pump in my 2005 was unplug the wiring harness running into the fuel pump shut off switch under the kick panel on the passenger's side. ran less then 2 seconds before it lost pressure and died.
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Old 04-18-2014, 11:07 PM   #8
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Quote:
Originally Posted by iminhell View Post
http://www.fordservicecontent.com/Fo.../07focog4e.pdf

Now you have an owners manual.
Fuses are on page 158.
Yep, I pulled the correct one. Oh well!
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Old 04-18-2014, 11:27 PM   #9
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Looking at the wiring diagram, F12 powers the FP Relay. From the Relay it goes to the Inertia Switch and then back the the Fuel Pump.
So removing that Fuse should remove all power to the pump.

I know the car will run for a little while with no pump as it bleeds the pressure down. But 3 hours is much longer than it should, about 10 times too long.
That has me wondering is it's something else? And the only thing I can think of is the EVAP system.
If for some reason the system is open and fuel vapor is leaking into the intake or liquid fuel is being sucked through, then the car could potentially run much longer.
In the older Foci, the ones with ominous fuel pump problems, you could overfill the tank and the extra fuel would bleed back into the charcoal canister. When the EVAP was open it could suck that fuel out, or pass air though it to dry out the media. If you've ever seen a picture of the inside of a Focus Fuel Pump Module and noticed the black debris, that's where it comes from, the Charcoal Canister.


Guess what I'm eluding to is that if you're not just replacing the Fuel Filter for the hell of it and due to some problem; you might want to have a shop look at the EVAP and verify it's operating correctly.
But if your MPG in your sig is correct, I wouldn't expect the EVAP to be an issue. I would expect lower MPG's if it's bad.
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Old 04-19-2014, 01:21 AM   #10
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Quote:
Originally Posted by iminhell View Post
<snip>
Guess what I'm eluding to is that if you're not just replacing the Fuel Filter for the hell of it and due to some problem; you might want to have a shop look at the EVAP and verify it's operating correctly.

But if your MPG in your sig is correct, I wouldn't expect the EVAP to be an issue. I would expect lower MPG's if it's bad.
Thank you for the information. It seems that no matter what it is in my life, I come across issues that never happen to anyone else, nor has anyone else heard of such. Hah!

I am only replacing the fuel filter to keep on-schedule with the maintenance (60k, as suggested by the Haynes manual).

My fuel efficiency has dramatically increased since my authorization of the signature. The last five fuel tanks have been over 40, with my most recent one being 42.85. :)
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