Go Back   Jaguar Forums - Jaguar Enthusiasts Forum > Jaguar Models ( Modern ) > XK8 / XKR
Sign in using an external account
Register Forgot Password?
Search

XK8 / XKR 1996 - 2006

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-25-2011, 07:53 PM
Member

 
Join Date: Aug 2011
Location: Las Vegas
Posts: 51
Thanked 1 Time in 1 Post
Default fuel gauge issue

New guy here!
Just got my 98 XK8. It has a few issues (I expect that).
My question, I have intermittent fuel gauge response.
I fill it up and it shows empty for a day or two then corrects. It also shows an error message that the range is faulty.
Would I look to connections at the tank sensor or elsewhere?
I appreciate any help.
Cheers
Willtoliv
Reply With Quote
  #2  
Old 08-25-2011, 11:30 PM
H20boy's Avatar
Veteran member

 
Join Date: Mar 2007
Location: Ft Worth, TX
Posts: 10,868
Thanked 742 Times in 580 Posts
Default

hmmm, glad my gauge is a little more reliable...I can't personally assist you on this one, but I think I've heard of a few guys around here with sender issues. Hang tight, you'll get some more replies soon.
__________________
Matt | 2003 XK8 CvTbl | 2005 SuperV8
My Jag Galleries



Go Texas Tech!


Reply With Quote
  #3  
Old 08-26-2011, 11:08 AM
Member

 
Join Date: Aug 2011
Location: Las Vegas
Posts: 51
Thanked 1 Time in 1 Post
Default

Thanks, this is a very impressive site. I'm looking forward to contributing.
Will
Reply With Quote
  #4  
Old 08-26-2011, 06:43 PM
Member
 
Join Date: Feb 2011
Location: San Francisco
Posts: 75
Thanked 2 Times in 2 Posts
Default

welcome to the club. before I bought my 2003 XK8 i thought that jaguar would have worked out all the screwy electrical problems they have ALWAYS had with their cars but, as most of us know, they haven't.

I've heard that the fix is to replace the sending unit in the tank. Apparently this is a simple thing to do if you have a coupe; if you have a convertible, i'm told you need to remove the fuel tank which not many people seem to want to do.

Be aware that if your fuel guage isn't reading correctly, your driver information center info is probably not right either - mine sure isn't. So don't rely on the RANGE or MPG info it gives or you just might get stranded by running out of gas.
Reply With Quote
  #5  
Old 08-30-2011, 09:55 AM
Senior Member

 
Join Date: Apr 2011
Location: Denver, Co
Posts: 102
Thanked 6 Times in 6 Posts
Default

Just to throw in here, mine started acting up just last week. Sometimes at vehicle start, it would peg way over full at the 2 o'clock position and take a couple of dances with the key on/off to get it to jump back down; sometimes it stays on empty. The range on the dash computer seems to show true, but I have started keeping the tank topped off just to be safe.

Question: If it is the sending unit on the tank, wouldn't that information be used to calculate the range, and thus show up as near zero when the gauge shows empty? This leads me to believe the problem is in the dash, not the tank, but then, I am fairly new to this
__________________

2005 XKR
2000 Jeep Wrangler lockers, lift, 33x12.5
Reply With Quote
  #6  
Old 08-30-2011, 11:08 AM
SeismicGuy's Avatar
Veteran Member

 
Join Date: Aug 2007
Location: Los Angeles
Posts: 2,355
Thanked 158 Times in 141 Posts
Default

You just have to end up accepting the fact that these cars have more tics than a cheap hotel room in New York. Among those that I have had are:
  • DSC warning that will come on randomly when starting the car and then go away after that
  • SRS light that was random and then stayed lit (this was recently resolved)
  • memory seat position circuitry that does not always bring things back to the correct position
  • low fuel warning light that came on one time AFTER completely filling the tank

I suspect a lot of modern cars that are filled with computer controlled sensors and servos have similar problems with quirky behavior but this seems especially true of our cars.

Doug
__________________
2005 XKR Convertible
Quartz/Dove
Los Angeles
Reply With Quote
  #7  
Old 08-30-2011, 11:33 AM
oldmots's Avatar
Veteran Member
 
Join Date: Jun 2008
Location: Chesapeake Bay area, Virginia
Posts: 1,433
Thanked 196 Times in 174 Posts
Default

I always try to remember that when participating on forums, tying the problem list to reliability of the car in general will give a distorted viewpoint. These cars are very reliable and well made, they are complex and things do fail, sometimes due to poor maintenance or other causes, sometimes due to design or build quality. Some of these cars are getting to be geriatric and you can only expect so much from an old high performance car that typically gets flogged a little more than some wagon family truckster.
__________________
05 XJ8 4.2
04 Audi A6 Quattro 3.0
06 XKR Coupe
04 Jeep Wrangler
09 Kawasaki Concours 1400
65 BMW R69S
67 Velocette Venom Thruxton
89 Honda GB500TT
Reply With Quote
  #8  
Old 08-30-2011, 04:30 PM
Senior Member
 
Join Date: Jan 2011
Location: Monmouth Co. NJ
Posts: 287
Thanked 18 Times in 18 Posts
Default

Oldmots, well said! Jack
Reply With Quote
  #9  
Old 08-30-2011, 06:28 PM
Member
 
Join Date: Feb 2011
Location: San Francisco
Posts: 75
Thanked 2 Times in 2 Posts
Default

.

Last edited by 2003 XK8; 08-30-2011 at 06:44 PM.
Reply With Quote
  #10  
Old 08-30-2011, 06:37 PM
Member
 
Join Date: Feb 2011
Location: San Francisco
Posts: 75
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by theweeb View Post

Question: If it is the sending unit on the tank, wouldn't that information be used to calculate the range, and thus show up as near zero when the gauge shows empty? This leads me to believe the problem is in the dash, not the tank, but then, I am fairly new to this
i don't think so. If I fill the tank and my fuel gauge stops at 1/2, the Driver's Info shows about 1/2 the range I would expect. If the gauge later creeps up the scale, the RANGE also increases on the Driver's Info display. Even if he gauge appears to be reading correctly and it has been zero'd, the Driver's Info always displays higher MPG than my manual calculation (the manual calculation is correct based on the gallons to fill the tank and the odometer).

I've had my gauge near the zero mark and the amber light come on and a fill-up took only 15 gallons (squeezing the pump to shut-off 4 to 5 times), so i really had almost 5 gallons still in the tank ....
Reply With Quote
  #11  
Old 08-30-2011, 06:43 PM
Member
 
Join Date: Feb 2011
Location: San Francisco
Posts: 75
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by SeismicGuy View Post

...I suspect a lot of modern cars that are filled with computer controlled sensors and servos have similar problems with quirky behavior but this seems especially true of our cars.
Quote:
Originally Posted by oldmots View Post

... you can only expect so much from an old high performance car that typically gets flogged a little more than some wagon family truckster.
without continung a difference of opinion, I'll just say that:

- if my jag had the quality of a $20k honda or toyota it would be an improvement; actually the same was true of my (now gone) 91 Sovereign and my 96 XJR .. c'mon - the state of the art in automotive technology in 2003 (!) can't make a reliable GAS GAUGE ?!?!?

- the '71 Chevelle SS i had as a kid was an old performance car, not my 2003 XK8; my car came from Beverly Hills and went back to the selling dealer in Hollywood for EVERYTHING including wiper blades - flogging and family wagons are in a different world ....
Reply With Quote
  #12  
Old 08-30-2011, 07:47 PM
Senior Member

 
Join Date: Apr 2011
Location: Denver, Co
Posts: 102
Thanked 6 Times in 6 Posts
Default

Quote:
Originally Posted by 2003 XK8 View Post
i don't think so. If I fill the tank and my fuel gauge stops at 1/2, the Driver's Info shows about 1/2 the range I would expect. If the gauge later creeps up the scale, the RANGE also increases on the Driver's Info display. Even if he gauge appears to be reading correctly and it has been zero'd, the Driver's Info always displays higher MPG than my manual calculation (the manual calculation is correct based on the gallons to fill the tank and the odometer).

I've had my gauge near the zero mark and the amber light come on and a fill-up took only 15 gallons (squeezing the pump to shut-off 4 to 5 times), so i really had almost 5 gallons still in the tank ....
This is of course your experience; I will attempt to take a picture of the fuel gauge at empty and the Driver's Info showing 280+ miles to show you mine. I think we are probably dealing with several causes that manifest in different ways.

As for the other comments on this issue vs. reliability, I can only say that in spite of the initial problems I had with the car and the subsequent "personality traits" that I now have adjusted to - like the exploding center console cup holder - I absolutely love this car and am thrilled every time I get behind the wheel. True.
__________________

2005 XKR
2000 Jeep Wrangler lockers, lift, 33x12.5
Reply With Quote
  #13  
Old 09-06-2011, 05:24 AM
Member
 
Join Date: Feb 2011
Location: San Francisco
Posts: 75
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by theweeb View Post
This is of course your experience; I will attempt to take a picture of the fuel gauge at empty and the Driver's Info showing 280+ miles to show you mine. I think we are probably dealing with several causes that manifest in different ways.
I guess it depends whether or not you still had gas left . If so, it sounds like maybe the Driver's Info works from the sender in the tank and your gauge is bad.

Quote:
Originally Posted by theweeb View Post
As for the other comments on this issue vs. reliability, I can only say that in spite of the initial problems I had with the car and the subsequent "personality traits" that I now have adjusted to - like the exploding center console cup holder - I absolutely love this car and am thrilled every time I get behind the wheel. True.
Yep - no self-respecting japanese auto maker would build a console like that. But don't worry, after you get it back together it will squeek like an old rocking chair every time you put your arm on it.

i find these cars easy to love and also easy to hate. After getting rid of my 1996, I was hoping to see improvements in my 2003 but, in a lot of ways, there's the same old crap ....
Reply With Quote
  #14  
Old 09-06-2011, 01:38 PM
Senior Member

 
Join Date: Aug 2011
Location: vero beach
Posts: 537
Thanked 39 Times in 33 Posts
Default

Quote:
Originally Posted by 2003 XK8 View Post
i don't think so. If I fill the tank and my fuel gauge stops at 1/2, the Driver's Info shows about 1/2 the range I would expect. If the gauge later creeps up the scale, the RANGE also increases on the Driver's Info display. Even if he gauge appears to be reading correctly and it has been zero'd, the Driver's Info always displays higher MPG than my manual calculation (the manual calculation is correct based on the gallons to fill the tank and the odometer).

I've had my gauge near the zero mark and the amber light come on and a fill-up took only 15 gallons (squeezing the pump to shut-off 4 to 5 times), so i really had almost 5 gallons still in the tank ....
That is a myth, you cannot fill the tank upto the same point you filled it up on you last fillup. Unless the tank is completely empty with each fillup and you are using a non-pressure fill hose.
The pressure varies inside your tank and the pump could cutoff at 9 gallons onetime and at 9.9 the next, making you think your gas mileage went up, when it did not. I know this because a friend of mine does the fuel validation for central Florida and one of the tests he does, is to fill a tank and see where the fuel pump shuts off and he does this for two reasons, one to check and see that the gas in the tank, matches the reading on the pump and that the pump does not overfill. He does this test 3 times and he says he rarely gets the same results.

So unless you had mythbusters fill your tank, I will trust what the car says. No offence is meant.
Reply With Quote
  #15  
Old 09-06-2011, 02:06 PM
Reverend Sam's Avatar
Veteran Member

 
Join Date: May 2010
Location: North Carolina
Posts: 3,682
Thanked 552 Times in 333 Posts
Default

I disagree with randy. Once you remove the filler cap the pressure in the tank equals atmospheric pressure. That friend that does the fuel validation for Florida might be noticing a difference of a tenth or two, but it's not going to vary by a gallon. And that has more to do with the foaming of the gas as it is squirted into the tank. The foam on top of the gas is highly variable, so the vacuum activated cutoff mechanism might pick up more foam one time and less foam the next. That's why after the pump cuts off I always give it a few seconds for the foam to settle down. Then I slowly put in more gas until the little cutoff hole is actually sucking in gasoline, not just foam.
__________________
2003 Jaguar XK8

That's not a decal. It's a real bird! Lucky timing.

Click RIGHT HERE to be taken to my YouTube channel. I have lots of videos which show how to repair and modify your XK8
Reply With Quote
  #16  
Old 09-06-2011, 03:33 PM
Senior Member

 
Join Date: Aug 2011
Location: vero beach
Posts: 537
Thanked 39 Times in 33 Posts
Default

Quote:
Originally Posted by Reverend Sam View Post
I disagree with randy. Once you remove the filler cap the pressure in the tank equals atmospheric pressure. That friend that does the fuel validation for Florida might be noticing a difference of a tenth or two, but it's not going to vary by a gallon. And that has more to do with the foaming of the gas as it is squirted into the tank. The foam on top of the gas is highly variable, so the vacuum activated cutoff mechanism might pick up more foam one time and less foam the next. That's why after the pump cuts off I always give it a few seconds for the foam to settle down. Then I slowly put in more gas until the little cutoff hole is actually sucking in gasoline, not just foam.
You misread what I said, I did not say atmospheric pressure. I was talking about the amount of pressure caused by the gas going into the tank.
Secondly, most people probably do not fill upto the cutoff hole.
Also, do you shake the car to get any air pockets out?

Also, I do not know what the test tank looks like, but I know him to be not prone to flights of fancy.

Last edited by randyb; 09-06-2011 at 03:54 PM.
Reply With Quote
  #17  
Old 10-20-2011, 11:10 AM
Senior Member

 
Join Date: Apr 2011
Location: Denver, Co
Posts: 102
Thanked 6 Times in 6 Posts
Default

. . . have not found the cause of this intermittent fuel gauge issue yet, but here is a (crappy) cell phone picture of the range computer working as it should even though the gauge shows empty.
Attached Thumbnails
fuel gauge issue-jaggasgageu-jpg  
__________________

2005 XKR
2000 Jeep Wrangler lockers, lift, 33x12.5
Reply With Quote
  #18  
Old 10-29-2011, 11:26 AM
Senior Member

 
Join Date: Apr 2011
Location: Denver, Co
Posts: 102
Thanked 6 Times in 6 Posts
Default

Yesterday this one happened, fuel gauge pegged way past full (did not know it could go that far). Fascinating problem....
Attached Thumbnails
fuel gauge issue-jagfuelgague-jpg  
__________________

2005 XKR
2000 Jeep Wrangler lockers, lift, 33x12.5
Reply With Quote
  #19  
Old 10-29-2011, 12:37 PM
OregonJag's Avatar
Senior Member
 
Join Date: Jun 2009
Location: Lake Oswego, OR
Posts: 341
Thanked 69 Times in 50 Posts
Default

My money says you've got a bad servo in the gas gauge or a loose connection to the instrument cluster as you stated in your first post. The info panel below the speedo would have a different line running to it and they both would use the same sending unit in the tank for fuel level info. If you use your "fuel used" information instead of the gas gauge aren't your fill ups mostly accurate?
__________________
'97 XK8 roaming the Pacific Northwet daily. 192k miles....
.. hey the sun's out . . . . .
Close the umbrellas and open the top! ...
Uh-oh, the rain's coming back ...
Reply With Quote
  #20  
Old 10-30-2011, 09:56 AM
Senior Member

 
Join Date: Apr 2011
Location: Denver, Co
Posts: 102
Thanked 6 Times in 6 Posts
Default

Quote:
Originally Posted by OregonJag View Post
My money says you've got a bad servo in the gas gauge
Thank you, that makes the most sense. Repairable? I will do a search...
__________________

2005 XKR
2000 Jeep Wrangler lockers, lift, 33x12.5
Reply With Quote
Old 10-30-2011, 09:56 AM
 
 
 
Reply



Tags
2003, 96, empty, fuel, gas, gauge, install, issue, jaguar, jaguars, problems, recall, sending, tank, unit, xk8, youtube



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 05:37 AM.

Copyright © 2010 Internet Brands, Inc. All rights reserved.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014 vBulletin Solutions, Inc. All rights reserved.
SEO by vBSEO ©2010, Crawlability, Inc.
JAGUAR and its logo are the registered trademarks of Jaguar Cars Limited. Jaguar Cars Limited is not affiliated with JaguarForums.com.