I believe its build up on the sensor of the fuel sending unit. Since they changed from gold to silver the new unit seems to get some build up on it.

 

yeah like I said I get that you want a new car perfect, and yes it is a problem that needs to be addressed. But what I'm saying isn't that ford is right for not fixing it. I'm saying that it's a flaw in fords and I feel lemoning out the car would be a waste. I love my car, including its little flaws, and I'm not saying you or anyone who complains doesn't. But the chance is still possible that the same problem will happen in a new mustang. and it's also not a big flaw in the car like those cheap harmonic balancers in the 05-09s. That's why I would say just don't worry/stress about it. Not because it's ok for it to be messed up, but the hassle isn't worth it. You're getting a LOT of car for your money and the one thing that's messing up isn't particularly essential to the car like strings to a guitar. you're allowed to your own opinion buddy. but hey this is coming from someone who would love to own a 5.0. I'd take a 5.0 with a jumpy fuel gauge any day. But yeah I understand, you payed money for it and it should be perfect.

 

If this were the case, I'd assume more than two would be posting this same problem, and Ford would have fixed the OP's Mustang on the first go around. These rare types of problems can be a bad wiring harness, from the fuel sender to the guage cluster. Extreemly hard to locate. A pinched harness during assembly. I'm certainly no ASE mechanic, but since the sending unit and cluster have been replaced with no positive results in one case, then the next step would be to assume a wiring fault. This may explain why the dealership has not found it yet; tracing the wiring is a long and tedious job.
The best answer I've read on this post so far is to involve the Ford regional rep. Get them involved.

 

You know that there is a TSB on this issue, right? Mine had it right off of the dealer lot. They performed the TSB and I had no other issues with it.

 

The problem is, I know there is gas in the tank, BUT all sensors have been changed over the past few months and my worry is that there is something else under lying. If you go by the TSB on this issue, there is no guarantee that fuel can be drawn from the fuller side of the saddle tank.

The dealer has seen the issue first hand and is determined to fix it for me one way or another.

 

No it doesn't start to back up, and yes the guage goes red too. Something is screwed up.

 

I just pulled up my W/O from the other week which states:

Verified concern. Checked OASIS. RE&RE both senders. Observed connecting hose kinked. Assemble sending units and hose on floor found hose would hit sending unit float on R/Side causing guage to read full always. replaced gas tank unit. Guage reads 1/8 of tank and verified level in tank the same. Cross over hose distorted and hitting float on R/side sender.

This was hoped to have finally resolved the problem but it didn`t even last more than one tank of gas.

As I mentioned the TSB was performed. New cluster per Ford as this was a leading cause of the same issue in the SHO. Fuel pump replaced, senders replaced numerous times. This is why it is frustrating.

 

I had this problem on my old car.

 

I did not figure it would fix your car MustangGTpilot. You problem is deeper rooted than just the TSB. I was pointing it out for the other folks that might have this problem. Mine happened on the first tank of gas that was put in in. Luckily, the TSB worked for me. Goodluck with yours....

 

MustangGTPilot, as going for broke mentioned, you should definitely get Ford of Canada involved. You can contact them at 1-800-565-3673. They’ll be able to help you with this. Let me know if you need me as well.

Deysha

 

Thanks Deysha I will give you a holla if I need extra help.

 

I like that you called me Buddy

 

it's kinda my thing

 

No problem, MustangGTPilot!

Deysha

 

Well I just got her back. Another new fuel pump fitted, apparently this is revision 3 to the 2011 fuel pump assembly, and a new set of level sensors. Will see if this fixes the problem or I will not be a happy bunny!!!