Fuel Capacity and Range and MPG readings

[trace30]

Originally Posted by aero77

All it states is replaced part number 94460-4Z000 Sender Assy-Fuel and part number 31150-4Z050 Tank Assy-Fuel Completed on 11/5/12. That's it nothing follows.

I wonder why they replaced the entire fuel tank assembly; that's a $765 part? Seems like the sender unit should have fixed it if the cluster electronics are ok? Any comment on that?

[trace30]

Originally Posted by trace30

I wonder why they replaced the entire fuel tank assembly; that's a $765 part? Seems like the sender unit should have fixed it if the cluster electronics are ok? Any comment on that?

And it is a very unique design to begin with:

[aero77]

Originally Posted by trace30

I wonder why they replaced the entire fuel tank assembly; that's a $765 part? Seems like the sender unit should have fixed it if the cluster electronics are ok? Any comment on that?

They had already replaced a sending unit on the first attempted fix with same results, still inaccurate. However, when they changed the combination tank and sending unit somehow miraculously it was fixed. TA DA.

All I know is that for 2 months my first few bars were depleting after 8-10 gallons and that was very fustrating. Can't compute MPG, not being able to go longer distances without always going to a gas station, and the biggy not knowing how much fuel you actually have at any given day.

Now the first bar drops after 30-40 miles, I can now use the vehicle to its fullest capacity. I only share this information with the rest of the world since it appears my vehicle been the first to do so. Yes, there is a fix. Maybe Hyundai engineers can ask my service center what they did? Recall??? Who knows???

MIles driven on full bars.JPG

miles left on full bars.JPG

[johndixs]

Aero77, is your hand calculated mpg still lower than car-indicated mpg by 3-4 mpg?

[trace30]

Originally Posted by aero77

They had already replaced a sending unit on the first attempted fix with same results, still inaccurate. However, when they changed the combination tank and sending unit somehow miraculously it was fixed. TA DA.

All I know is that for 2 months my first few bars were depleting after 8-10 gallons and that was very fustrating. Can't compute MPG, not being able to go longer distances without always going to a gas station, and the biggy not knowing how much fuel you actually have at any given day.

Now the first bar drops after 30-40 miles, I can now use the vehicle to its fullest capacity. I only share this information with the rest of the world since it appears my vehicle been the first to do so. Yes, there is a fix. Maybe Hyundai engineers can ask my service center what they did? Recall??? Who knows???

Attachment 57858

Attachment 57859

It is a very strange situation. We need to figure out if there is any part number/manufacture date differentiation on the original sender unit and tank versus what they replaced it with. That is the only unknown. I have not seen a post by anyone who has not had a problem with this from the factory; perhaps the answer is ALL the sender units used at factory assembly are defective and they used a new lot number to repair your unit the second time. I just can't fantom why the tanks would be defective but we just don't know at this point.

[aero77]

Originally Posted by johndixs

Aero77, is your hand calculated mpg still lower than car-indicated mpg by 3-4 mpg?

Yes, about 4 mpg

Eco on - 26.8
Eco off - 26.2

I know it's another thread but this is related to this fuel gauge issue.

[johndixs]

Aero77,
Concur that the two issues are quite probably related. My car indicated mpg is optimistic by 2.5-3.0 mpg compared to hand calculated numbers.

I have a Scanguage II mounted on the top of the steering wheel cover, and the OBD outputs for both instantaneous mpg and average mpg do not agree with the car data presented on the center display. The differences are rather large. Really makes one wonder, as those parameters were in very close agreement on my previous vehicle. Is this situation a sub plot associated with the top level story of incorrect EPA test reporting?

[Mattmilw]

Originally Posted by johndixs

Aero77,
Concur that the two issues are quite probably related. My car indicated mpg is optimistic by 2.5-3.0 mpg compared to hand calculated numbers.

I have a Scanguage II mounted on the top of the steering wheel cover, and the OBD outputs for both instantaneous mpg and average mpg do not agree with the car data presented on the center display. The differences are rather large. Really makes one wonder, as those parameters were in very close agreement on my previous vehicle. Is this situation a sub plot associated with the top level story of incorrect EPA test reporting?

Just wondering, how do the Scangauge numbers compare to hand calculated mileage numbers?

[johndixs]

Matt,

Scanguage mpg is lower than manual calc, by 4-5 mpg. Makes no sense, of course, unless the Scanguage coding has an error, or if there are some very basic software problems with the on board calculation. The Nav system GPS miles/ hour compares perfectly with the speedometer, so I am assuming the raw mileage calculation is accurate.

[KenDude]

Originally Posted by aero77

Both tanks took 15 gallons. MPG tank 1 26.2 and tank 2 26.8. I am very happy with results for fuel indications and MPG now. I can finally use the vehicle as advertised. I hope they fix all of them.

You must be driving a lot of highway my friend because it mixed driving i'm struggling to get even 21mpg on my 2.0T FWD.

I will ask my dealer if there is a certified "fix" now for the problem.