Hi,

After filling my fuel tank to the very top, the fuel gauge in my
'01 ML320 (110k miles) reads a little above 3/4 of a tank. This
just started happening on long trip. Is there a reasonable way
to figure out whether the gauge is bad or the sender is bad?
.. or something else?

Thanks,

dac

__________________
dac

My '98 is doing the same thing...someone said that it requires replacing a $1,000 set of senors and pumps.

The accuracy at the lower end of the scale seems to be off by ~3 gallons. When the low level comes on, I seem to have ~6 gallons of fuel remaining. Is this the same for yours?

__________________
Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)

I thought that was fixed after 1999.
- There are threads on how to modify the float so tit doesnt get stuck. The float is on the fuel pump under the rear seat.
My 1999 would only go to 3/4 when full/ . I decided to go with the upgrade.
Replacing the Fuel pump (under $200 ish with my labor ) cured mine. I just filled up today..goes right to the Full Mark. Who told you about all that money and sensors ?

I also did the fuel lines and filter. it was about $300 total.

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Can't recall who said that, but it was on either this forum or the Benz Bin one. Perhaps that grand is the dealer doing the work. What is the fuel pump upgrade?

I am still learning about these as I have only had mine for less then a month.

__________________
Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)

the upgrade is a fuel pump that the float works.

and they made redesigned fuel lines and filter so you dont have to remove the seat to change the filter.

I dont know why, ya change it every 100,000 miles...so who cares...But I did it anyways... I did mine at 105,000.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles

Well, that's interesting info re: the fuel pump/float upgrade.

I had to have the fuel pump replaced about a year ago. Suddenly
it wouldn't start - no warning at all. I took it to the dealer (mistake)
and $750.00 later I had a new fuel pump, lines, filter.

I'll have to look for the threads on how to modify the filter.

Thanks,

__________________
dac

$750.00 vs my $300.

That's $450.00 for tuition.

I am confident they upgraded your lines and filter.
I hate to think they used the unreliable old style pump// but why else would it act that way...

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles

Any idea how would I be able to tell if the newer
style pump was installed?

Thanks

__________________
dac