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Replace the fuel pump

Tiny
MISSYG
  • MEMBER
  • 2005 MAZDA 3
  • 4 CYL
  • 2WD
  • AUTOMATIC
I need instructions on how to replace the fuel pump on 2005 mazda 3 2.3 liter. The check engine light came on several months ago (about 6-8) and I took it in for routine maintenance and had them check it out. I was told the fuel pump was getting "sluggish". For a couple of months now the car has been hard to start after putting gas in and is now stalling at times when sitting at traffic lights, etc.
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Friday, August 12th, 2011 AT 4:10 PM

6 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
The fuel pump would not trigger the CEL. What were the exact trouble codes retrieved? Fuel pump will cause a check engine light if the fuel pressure is low enough especially on a 2005. They set codes for fuel system too lean on idle and off idle. Here is how to replace the fuel pump guide with diagrams below to show you on our car.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

You will need to remove the tank. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

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Friday, August 12th, 2011 AT 4:20 PM
Tiny
MISSYG
  • MEMBER
  • 4 POSTS
I don't know what the trouble codes were. The mechanic just said that they checked it out and the only thing that showed any sign of a problem was the fuel pump. I didn't feel the need to replace it right then and figured I would wait until I had to replace it. Now I do not have the money to take it in to the repair shop to have it done and thought I would try it myself. I have a friend who replaced hers with a video on youtube.
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Friday, August 12th, 2011 AT 4:35 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Most parts stores provides free scanning services. Go get the code and we shall see what needs to be done.

Replacing a component without understanding what is wrong could be a waste of time and money.
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Friday, August 12th, 2011 AT 4:39 PM
Tiny
MISSYG
  • MEMBER
  • 4 POSTS
OK. If I get a code you will know what the code means? What I'm asking is are the codes universal, meaning everyone uses the same ones?
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Friday, August 12th, 2011 AT 4:45 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Yes, OBD-II codes are universal. It will tell us what component/system is at fault. We can go along the codes to diagnose and rectify the problem.
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Friday, August 12th, 2011 AT 4:48 PM
Tiny
MISSYG
  • MEMBER
  • 4 POSTS
Ok. I will get that done as soon as possible and let you know. It may be later this afternoon.I think I will call the Mazda dealership I took the car too before and see if they will give me the codes.
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Friday, August 12th, 2011 AT 5:01 PM

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When a fuel pump goes out it can do so one of two ways either it can quit and stop working or it can fail intermittently causing the engine to stall or not start.

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