Hello everyone!

It seems that my 2010 XK might have a fuel leak and I can't find the actual leak or cause. NO fuel spillage can be detected via visual or smell yet the fuel level display and range ticks down at a WAY faster than normal pace. I will lose about 6 extra miles on a 12 mile trip. Has anyone heard of any weak links or common issues with this year/model regarding this type of issue?

Appreciate any help as I haven't been able to find any information online so far.

Thanks!

Brian

 

If you can't smell it or can't see it then you don't have a leak. Are your tail pipes black , does it idle normally. Can you check your water temperature. Do you have any codes. Have you changed brands of fuel.

 

Running rich?

 

Use OBD - such as an elm327:
1. check goes CL (closed loop) very soon after starting
2. then check fuel trims

If, for example, it stays OL (open loop) you'll have terrible MPG.

 

Hopefully I have answers to all of your questions and I REALLY appreciate the help!!

My tail pipes do indeed have some black on them. I will try to attach a picture to this post.
Idle is normal and smooth. Coolant temp per Torque Pro via OBD is 188 degrees. No codes and I tend not to use the same brand or gas station when I fill up but I always use premium.

I’m not sure how to check for closed loop and I’m not sure what the proper fuel trim settings should be. I will post the test results below as well as the fuel trim results.

Fuel Trim Bank 1 Long Term: 7.81%
Fuel Trim Bank 1 Sensor 2: -1.56%
Fuel Trim Bank 1 Short Term: 1.56%
Fuel Trim Bank 2 Long Term: 7.81%
Fuel Trim Bank 2 Sensor 2: 1.56%
Fuel Trim Bank 2 Short Term: 2.34%


Test report:
------------------
MID:$01 TID:$82
- O2 Bank 1 Sensor 1
Max: 65.535 Min: 0.3
Test result value: 0.967
PASS
----
MID:$01 TID:$83
- O2 Bank 1 Sensor 1
Max: 126Ohm Min: 0Ohm
Test result value: 39Ohm
PASS
----
MID:$01 TID:$9a
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$9b
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$9c
- O2 Bank 1 Sensor 1
Max: 720ms Min: 0ms
Test result value: 420ms
PASS
----
MID:$01 TID:$9d
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$9e
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$02 TID:$85
- O2 Bank 1 Sensor 2
Max: 65.535V Min: 0.35V
Test result value: 0.962V
PASS
----
MID:$02 TID:$86
- O2 Bank 1 Sensor 2
Max: 120ms Min: 0ms
Test result value: 20ms
PASS
----
MID:$02 TID:$9f
- O2 Bank 1 Sensor 2
Max: 65,535ms Min: 10ms
Test result value: 2,490ms
PASS
----
MID:$05 TID:$82
- O2 Bank 2 Sensor 1
Max: 65.535 Min: 0.3
Test result value: 0.848
PASS
----
MID:$05 TID:$83
- O2 Bank 2 Sensor 1
Max: 60Ohm Min: 0Ohm
Test result value: 39Ohm
PASS
----
MID:$05 TID:$9a
- O2 Bank 2 Sensor 1
Test incomplete or dependant test failed
--
MID:$05 TID:$9b
- O2 Bank 2 Sensor 1
Test incomplete or dependant test failed
--
MID:$05 TID:$9c
- O2 Bank 2 Sensor 1
Max: 720ms Min: 0ms
Test result value: 409ms
PASS
----
MID:$05 TID:$9d
- O2 Bank 2 Sensor 1
Test incomplete or dependant test failed
--
MID:$05 TID:$9e
- O2 Bank 2 Sensor 1
Test incomplete or dependant test failed
--
MID:$06 TID:$85
- O2 Bank 2 Sensor 2
Max: 65.535V Min: 0.35V
Test result value: 0.928V
PASS
----
MID:$06 TID:$86
- O2 Bank 2 Sensor 2
Max: 120ms Min: 0ms
Test result value: 40ms
PASS
----
MID:$06 TID:$9f
- O2 Bank 2 Sensor 2
Max: 65,535ms Min: 10ms
Test result value: 2,670ms
PASS
----
MID:$12 TID:$cf
-
Max: 0 Min: 41,024
Test result value: 61,465
FAIL
----
MID:$21 TID:$88
- Catalyst Monitor Bank 1
Max: 15V Min: 0V
Test result value: 3.11V
PASS
----
MID:$22 TID:$88
- Catalyst Monitor Bank 2
Max: 15V Min: 0V
Test result value: 2.99V
PASS
----
MID:$35 TID:$a1
-
Max: 160° Min: 0°
Test result value: 71.27°
PASS
----
MID:$35 TID:$a2
-
Max: 11° Min: 0°
Test result value: 0.02°
PASS
----
MID:$35 TID:$a3
-
Max: 10° Min: -10°
Test result value: -0.86°
PASS
----
MID:$35 TID:$a4
-
Max: 10° Min: -10°
Test result value: -0.86°
PASS
----
MID:$35 TID:$a5
-
Max: 160° Min: 0°
Test result value: 115.57°
PASS
----
MID:$35 TID:$a6
-
Max: 11° Min: 0°
Test result value: 0.64°
PASS
----
MID:$35 TID:$a7
-
Max: 10° Min: -10°
Test result value: -1.15°
PASS
----
MID:$35 TID:$a8
-
Max: 10° Min: -10°
Test result value: -1.15°
PASS
----
MID:$36 TID:$a1
-
Max: 160° Min: 0°
Test result value: 70.88°
PASS
----
MID:$36 TID:$a2
-
Max: 11° Min: 0°
Test result value: 0.05°
PASS
----
MID:$36 TID:$a3
-
Max: 10° Min: -10°
Test result value: 2.29°
PASS
----
MID:$36 TID:$a4
-
Max: 10° Min: -10°
Test result value: 2.29°
PASS
----
MID:$36 TID:$a5
-
Max: 160° Min: 0°
Test result value: 116.04°
PASS
----
MID:$36 TID:$a6
-
Max: 11° Min: 0°
Test result value: 0.5°
PASS
----
MID:$36 TID:$a7
-
Max: 10° Min: -10°
Test result value: 1.19°
PASS

 

Should have a status value for closed/open loop etc. If OL it'll be bad mpg as it dare not do other than run rich.

Ignore MID/TID.

Trims, parked, hot engine, at idle & again at about 2500rpm.

You could out of curiosity also get a passenger to look when driving (or record data, if it will).

It's worth doing brim-to-brim fuel fills & hand calculate mpg as a sanity check.