2004 XJ8 Fuel Gauge problem
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2004 XJ8 Fuel Gauge problem
When I fill up the car, the next day, have been getting a reading of empty, and the light comes on. Drive for a bit, and the gauge goes all the way up. Sometimes, when driving, the same thing happens. My dealer says it is the fuel pump which has a sending unit, and a seperate sending unit (which is called the jet pump assembly), and that either or both can be bad. He wants to do both for a cost of $1,000 (2.25 hours labor), which sounds and will be really expensive.
I read in the original motor trend and consumer reports test of this car that this was an issue on their test cars. I just came out of warranty in December, only 22,000 miles on the car.
Any suggestions, does this sound right?
Thanks Mike
I read in the original motor trend and consumer reports test of this car that this was an issue on their test cars. I just came out of warranty in December, only 22,000 miles on the car.
Any suggestions, does this sound right?
Thanks Mike
Last edited by GGG; Aug 13, 2012 at 01:42 PM. Reason: typo in thread title
Joined: Jun 2007
Posts: 2,076
Likes: 40
From: Pompino Beach , FL
RE: 2004 xj8 fuel guage problem
they can diagnose which ones is faulty at the dealer.. but most people like to put in both.. due to them being so fragile. there made of plastic and dont relly last too long.. the terminals on the resistor part can get all rusty.. i usually charge 2 hrs including diag.. but 2.25 isnt that far off
Joined: Jan 2008
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From: 33498
RE: 2004 xj8 fuel guage problem
4 hours is robbery.
You can tell if problem is sender or instrument pack.
Put keyin ignition, hold in trip button and start car, keep holding trip for 5 seconds and should say test mode on instrument pack.
Release trip button and with each press it will show different things on pack. Keep pressing until you see raw fuel 1. Once you see this keep driving until gauge drops. When dropped look at reading then press trip again. This will show raw fuel 2. A reading of 15 or 255 is the bad one. Raw 1 is right side raw 2 is left. If both readings stay normal, and gauge shows empty then your instrument pack is likely bad.
You can tell if problem is sender or instrument pack.
Put keyin ignition, hold in trip button and start car, keep holding trip for 5 seconds and should say test mode on instrument pack.
Release trip button and with each press it will show different things on pack. Keep pressing until you see raw fuel 1. Once you see this keep driving until gauge drops. When dropped look at reading then press trip again. This will show raw fuel 2. A reading of 15 or 255 is the bad one. Raw 1 is right side raw 2 is left. If both readings stay normal, and gauge shows empty then your instrument pack is likely bad.
Junior Member
Joined: Nov 2006
Posts: 10
Likes: 0
Rem
Had a similar problem. Gauge would drop to nothing, light would come on and display would warn of low fuel. After several attempts at repair it turned out to be the REM (rear electrical module). Problem hasn't come back.
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Junior Member
Joined: Dec 2011
Posts: 22
Likes: 2
From: bedford,tx
fuel gauge problem
4 hours is robbery.
You can tell if problem is sender or instrument pack.
Put keyin ignition, hold in trip button and start car, keep holding trip for 5 seconds and should say test mode on instrument pack.
Release trip button and with each press it will show different things on pack. Keep pressing until you see raw fuel 1. Once you see this keep driving until gauge drops. When dropped look at reading then press trip again. This will show raw fuel 2. A reading of 15 or 255 is the bad one. Raw 1 is right side raw 2 is left. If both readings stay normal, and gauge shows empty then your instrument pack is likely bad.
You can tell if problem is sender or instrument pack.
Put keyin ignition, hold in trip button and start car, keep holding trip for 5 seconds and should say test mode on instrument pack.
Release trip button and with each press it will show different things on pack. Keep pressing until you see raw fuel 1. Once you see this keep driving until gauge drops. When dropped look at reading then press trip again. This will show raw fuel 2. A reading of 15 or 255 is the bad one. Raw 1 is right side raw 2 is left. If both readings stay normal, and gauge shows empty then your instrument pack is likely bad.
Last edited by David Cupp; Jun 14, 2012 at 02:37 PM. Reason: not enough info..
Junior Member
Joined: Dec 2011
Posts: 22
Likes: 2
From: bedford,tx
fuel gauge problem
i did all the above, however i couldn't get 'test mode' to come up. inst. problem?..gauge shows 3/4 full and works fine below that level. just won't show full. can't seem to figure out if it's the inst. cluster or fuel pump sender. and ideas? also, is it possible to put in new fuel pump and sender myself? are they inside or outside the fuel tank? are there other pumps that would last longer/ and fuel senders as well?
Last edited by David Cupp; Jul 22, 2012 at 08:39 AM. Reason: looking for answers
Junior Member
Joined: Dec 2011
Posts: 22
Likes: 2
From: bedford,tx
i hold in the trip button, put key in ignition, start my car, continue holding in trip button for 5 sec. plus...and nothing happens. am i doing this procedure wrong? my gas gauge ,when tank is full shows between 2/3 and 3/4 full until it goes below that level, then it works fine. it's embarrasing and such a nice car should have a gas gauge that is ..well, cheaply made, that it won't work right.
Veteran Member
Joined: Nov 2009
Posts: 3,145
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From: The beautiful Mornington Peninsula in OZ
fuel gauge problem
Try searching for fuel gauge faults on this forum.
A Jag Tech here has said that these fuel gauge faults are due to corroded contacts on the sender unit(s) in which case I would think that is repairable.
The sender is located with the fuel pump in the fuel tank-there may be two senders I am not sure.
A Jag Tech here has said that these fuel gauge faults are due to corroded contacts on the sender unit(s) in which case I would think that is repairable.
The sender is located with the fuel pump in the fuel tank-there may be two senders I am not sure.
Junior Member
Joined: Dec 2011
Posts: 22
Likes: 2
From: bedford,tx
i did all the above, however i couldn't get 'test mode' to come up. inst. problem?..gauge shows 3/4 full and works fine below that level. just won't show full. can't seem to figure out if it's the inst. cluster or fuel pump sender. and ideas? also, is it possible to put in new fuel pump and sender myself? are they inside or outside the fuel tank? are there other pumps that would last longer/ and fuel senders as well?
Member
Joined: Jul 2012
Posts: 30
Likes: 5
From: Orlando
I had a similar issue with my '04 S-type that I sold. I had the fuel pump die on the interstate and the Ford dealer replaced one of the fuel pumps. About 4 months later the car died again and the other pump went out. My warranty covered both, but between the time that the first pump was replaced and the second is when the fuel gauge would not show full, only 3/4 full. And at times when a little less that a quarter left in tank, the gauge would drop to empty. I mention this only because it wasn't the instrument cluster that was my issue, it was the sending unit and fuel pump. my guess is that the gauge would not work at all if it were the instrument cluster that was your issue, but I'm no expert.
Junior Member
Joined: Dec 2011
Posts: 22
Likes: 2
From: bedford,tx
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Senior Member
Joined: May 2010
Posts: 349
Likes: 12
From: FL
Where is the REM? located I am having the same problem
Senior Member
Joined: May 2010
Posts: 349
Likes: 12
From: FL
What did you do or the dealer in reference to the REM (rear electrical module)?
Did you have to replace it or it is something that can be done to remedy the annoying gauge drop
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