Fuel pump problems - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 26 (permalink) Old 05-23-2007, 12:29 PM Thread Starter
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I have a 2003 3.0L, and about six months ago, the fuel pump relay was shorting out sometimes when I tried to start the car. I bought a new relay, and I would just switch out the relay if the car wouldn't start, and it would be fine. It actually only did it a few times, and it hadn't given me any trouble in months. Well, the other day, the car wouldn't start, and this time, it's actually the fuel pump that's bad. Has anyone else had problems with their fuel pumps?

My other question is, when I went to order a new one from the dealership, they have different ones listed for a roof mounted antenna, and a glass mounted antenna. I understand that they have different fuel pumps for the model year, but why would they have different pumps (for the same engine) associated with different antenna placement? I just found that weird.
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post #2 of 26 (permalink) Old 05-23-2007, 12:33 PM
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Maybe the glass mount to roof mount antenna happens to coincide with multiple changes made by Mazda during the production of the car, and the easiest identifying method for the Mazda parts catalog is the antenna.

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post #3 of 26 (permalink) Old 05-23-2007, 12:36 PM Thread Starter
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Good point, I hadn't thought about that
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post #4 of 26 (permalink) Old 05-23-2007, 01:59 PM
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From memory the fuel pump pressure is voltage regulated, not by vacuum. When the pickup screen disc gets clogged (From running it below 1/4 tank), the fuel pump doesn't get it's necessary fuel and starts raising voltage thinking it's a pressure issue due to lack of fuel volume, which could explain the relay burning up/shorting out. This also explains why the pump is now bad.

Ford has used this design of fuel pumps, very flawed, since the Ford Contour.

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post #5 of 26 (permalink) Old 05-23-2007, 02:16 PM Thread Starter
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Interesting, that definitely could be what happened. Thanks for the info
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post #6 of 26 (permalink) Old 01-22-2008, 02:55 AM
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Anyone know how difficult the fuel pump replacement would be?? Is it going to be neccesary to remove the rear seats??? Is it a simple top mounted type filter that jus require unbolting or is there mroe involved?
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post #7 of 26 (permalink) Old 01-22-2008, 09:33 AM
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Anyone know how difficult the fuel pump replacement would be?? Is it going to be neccesary to remove the rear seats??? Is it a simple top mounted type filter that jus require unbolting or is there mroe involved?[/b]
Alot of cars have access points within the cabin to get to the fuel pump, however when you seperate the lines from the fuel pump or just pull it out of the tank, fuel starts leaking out. I had quite a mess to clean up in a customers 240SX one time through taking the fuel pump out from within the vehicle. Since then, I have always dropped the fuel tank to remove the fuel pump.

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post #8 of 26 (permalink) Old 01-22-2008, 09:52 AM
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yea man..........i think im having the ame issue with my escort. runs fine at times. periodially it'll run lean. then the fuel will come back. under boost it breaks up sometimes. a code comes sayin Fuel pump driver module offline. which i beleive is because its straining to supply enough fuel. i changed both the fuel pump and FPDM. still does it. it aint the tune because i havent changed anything


so now i think it may be a clogged fuel filter.....stopping tsome of the fuel and the car senses the drop and faises fuel pressure from the pump so much that it reaches its limits and shut it out

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post #9 of 26 (permalink) Old 01-22-2008, 02:09 PM
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Where is the access point for teh fuel pump on the 6 though?? I'm going to have to do a DIY replacement and just need to know where/how to access it.
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post #10 of 26 (permalink) Old 01-22-2008, 03:16 PM
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the fuel fitler is in the tank on the pump. from what ive heard.....the factory say the fuel filter needs no replacing. the pump should be under the rear seat tho. i dont remember seeing an inline filter. but there may be one somewhere

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