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Old 05-19-2013, 12:19   #1 (permalink)
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2005 Mercury Montego fuel problem

Hello everyone! 1st post, hoping you guys can help me out.
Car just died going down the road and I have no power going to the fuel pump. I have power going to and coming out of the fuel pump relay, and even jumped the relay so power should be going to the pump but when I check the pump connecter I get no power on any of the 4 connecters. I read on here about a fuel pump module and fuel shut off switch?? Can anyone tell me were these are please?
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Old 05-19-2013, 12:38   #2 (permalink)
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Re: 2005 Mercury Montego fuel problem

The fuel pump shut-off switch is
located in the front passenger
footwell area in the right upper
corner.
To reset the switch:
1. Turn the ignition OFF.
2. Check the fuel system for leaks.
3. If no leaks are apparent, reset the
switch by pushing in on the reset
button.
4. Turn the ignition ON.
5. Wait a few seconds and return
the key to OFF.
6. Make another check for leaks.
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Old 05-19-2013, 16:59   #3 (permalink)
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Re: 2005 Mercury Montego fuel problem

Figure 3 has a diagram for the pump. | Repair Guides | Engine Control Systems (2005) | Engine Control Systems (2005) | AutoZone.com
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Old 05-20-2013, 07:24   #4 (permalink)
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Re: 2005 Mercury Montego fuel problem

Quote:
Originally Posted by R.S.LOGAN View Post
The fuel pump shut-off switch is
located in the front passenger
footwell area in the right upper
corner.
To reset the switch:
1. Turn the ignition OFF.
2. Check the fuel system for leaks.
3. If no leaks are apparent, reset the
switch by pushing in on the reset
button.
4. Turn the ignition ON.
5. Wait a few seconds and return
the key to OFF.
6. Make another check for leaks.
Thank you for that. I've reset the shut-off switch and tested it, it has power going in and coming out, but still no voltage to the pump. Should I be looking at the fuel pump module?? Where is that located?
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Old 05-20-2013, 08:11   #5 (permalink)
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Re: 2005 Mercury Montego fuel problem

According to this thread the module is in the fuel pump?
2005 Mercury Montego Fuel Pump - Need help please!
If I have no power going to the 4 wire plug on top of the pump, the module is not going to be my problem then, right?
By the way, gas gauge seems to work fine.
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Old 05-20-2013, 08:32   #6 (permalink)
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Re: 2005 Mercury Montego fuel problem

Okay, this is crazy. I just went to check the voltage again and jumped the relay and noticed a small spark and fuel started pumping out the disconnected fuel line under the hood. So I put the fuel relay and fuel line back on and it starts right up and revs for a second or two and I hear the pump running, but the car dies right away with a chug chug chug. Like it's running out of fuel but there's still pressure in the fuel rail and I hear the pump running for a few seconds after the motor dies. The only codes are for random misfire at start up. Checking the fuel pressure I have about 52psi. Any ideas?
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Old 05-20-2013, 13:21   #7 (permalink)
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Re: 2005 Mercury Montego fuel problem

Made a short video of what's doing........
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Old 05-20-2013, 18:01   #8 (permalink)
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Re: 2005 Mercury Montego fuel problem

Well, your video is marked as private. Is your tank full or on the low side?If you're pulling air in the suction of the pump, it'll act like it's out of gas with the pressure up where it belongs. You're fuel pressure gauge should have a vent port on it, vent it into a suitable container and jump out the pump, see if it sustains a steady stream or if you get spurts.
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Old 05-20-2013, 20:56   #9 (permalink)
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Re: 2005 Mercury Montego fuel problem

Sorry about that, changed to public. There is over a half a tank of fuel so no chance it's sucking air and it holds pressure after the key is off and I have a steady even flow.
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Old 05-21-2013, 16:34   #10 (permalink)
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Re: 2005 Mercury Montego fuel problem

I'd still run the pump and see if you have a steady flow, you have the tools and it's an easy go-nogo check.
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