Multiple fuel pump replacements
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Junior Member
Joined: Mar 2020
Posts: 1
Multiple fuel pump replacements
Hey everyone,
I have a 2007 expedition that we have had the fuel pump replaced several time already and I believe it is having issues again. My manuel gauge will drop to E along with the digital gauge giving me a - - - reading then appear normal but usually always drops mileage. Last week it also started driving rough and I’m at a loss and not willing to put much more money into as we have put 5K into it and this is an ongoing problem! Any advice would be much appreciated before I giving up on this thing.
I have a 2007 expedition that we have had the fuel pump replaced several time already and I believe it is having issues again. My manuel gauge will drop to E along with the digital gauge giving me a - - - reading then appear normal but usually always drops mileage. Last week it also started driving rough and I’m at a loss and not willing to put much more money into as we have put 5K into it and this is an ongoing problem! Any advice would be much appreciated before I giving up on this thing.
Senior Member
Joined: Jun 2010
Posts: 16,662
There are a few things that can contribute to this problem.
The first question is where were the replacement pumps purchased?
We don't know what kind of testing was done before the decision was made to just replace the fuel pump.
If for instance, all that was checked was fuel pump pressure ,which was found to be low or absent and an assumption was made the pump was defective without actually checking the entire system.
There is apparently more going on than what might have been suspected.
If insufficient power is not getting back to the fuel pump driver module , the pump can't do it's job.
If, there is a problem with the module , was it checked out?
A poor ground connection to everything back there can cause all sorts of problems including the reading you received. This problem requires someone with some electrical experience to thoroughly check ALL these things before condemning the pump.
Unfortunately a lot of good working fuel pumps get replaced because the checks were not done.
As far as advice, is there another shop you might consider ? Not knowing those circumstances , not wise to throw out suggestions that may not be capable to do.
I do think it's time to find someone that can do those checks and find the original problem and correct it.
Sorry for being so winded, some things just don't present themselves with simple answers.
The first question is where were the replacement pumps purchased?
We don't know what kind of testing was done before the decision was made to just replace the fuel pump.
If for instance, all that was checked was fuel pump pressure ,which was found to be low or absent and an assumption was made the pump was defective without actually checking the entire system.
There is apparently more going on than what might have been suspected.
If insufficient power is not getting back to the fuel pump driver module , the pump can't do it's job.
If, there is a problem with the module , was it checked out?
A poor ground connection to everything back there can cause all sorts of problems including the reading you received. This problem requires someone with some electrical experience to thoroughly check ALL these things before condemning the pump.
Unfortunately a lot of good working fuel pumps get replaced because the checks were not done.
As far as advice, is there another shop you might consider ? Not knowing those circumstances , not wise to throw out suggestions that may not be capable to do.
I do think it's time to find someone that can do those checks and find the original problem and correct it.
Sorry for being so winded, some things just don't present themselves with simple answers.
Senior Member
Joined: Jun 2010
Posts: 16,662
It's nice when you install a new part and everything works as it should.
However, a lot of new parts just are not up to snuff, and some of these things like gauge readings can be verified before buttoning up everything and condemning the part after installation is complete. Rough handling can and does alter some sending units and simple slight altering of the float arm can yield incorrect readings. The modules are somewhat intricate and delicate and don't tolerate rough handling very well.
However, a lot of new parts just are not up to snuff, and some of these things like gauge readings can be verified before buttoning up everything and condemning the part after installation is complete. Rough handling can and does alter some sending units and simple slight altering of the float arm can yield incorrect readings. The modules are somewhat intricate and delicate and don't tolerate rough handling very well.
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