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19th April 2010, 07:23 | #1 |
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fuel gauge slightly weird
is this normal? I park up with quarter plus in tank leave over night and then in the morning gauge has dropped and low fuel comes on, start driving and over the next 5 miles or so the gauge rises back up to where it was the night before!! I'm guessing that one of the tank sensors might be sinking overnight? As well question is which reading is correct.......
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19th April 2010, 08:03 | #2 |
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I don't think it is normal. When I first start my car, the light does come on and takes about 10 seconds to go out and the guage to show how much fuel is in.
Could be the sender unit needs an early cup of coffee. |
19th April 2010, 10:06 | #3 |
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When you get into the car before putting on the ignition push the trip reset button and the mileage and fuel level should read for a time.That should a least test it.
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19th April 2010, 11:36 | #4 |
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My car does this too, but i've only noticed it if I've been running under 1/4 of a tank. Since reading this forum I've not let it drop below 1/2 a tank, because I'm trying to look after the fuel pumps, so I don't notice it any more.
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19th April 2010, 15:37 | #5 |
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Running the trip screen's Diagnostic Mode under Test 6 may shed some light onto what's happening with each sender unit.
TC |
19th April 2010, 21:16 | #6 |
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spooky great minds think alike! just come inside from doing just that! both sender units show as giving good signal but one is showing very low even though the tank is getting on for half full!! I guess one only floats properly when there is some vibration on the move but sinks when parked?? not really worth messing with at the moment more pressing renovations to do as not had the car long
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19th April 2010, 21:48 | #7 |
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The float could be punctured, but I couldn't explain the variability in output. If any work has been done in the tank, the faulty float may not have been re-installed properly and could be rubbing on something. They are very sensitive to the innards of the tank.
As a matter of interest for keeping the diagnostic routine up to date, what did the screen display actually say? TC |
20th April 2010, 00:54 | #8 |
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If it's any consolation, my fuel gauge (2002 CDT 75 Tourer) behaves very like the one described.
Moreover, how much it shows seems to be linked in some arcane way to how I'm driving. If I'm driving economically - as I usually I am - it rises a little sometimes on a trip - as if to reward me almost for my good behaviour. But then will it fall suddenly and dramatically if I put my foot down - as if it is trying to tell me that if I drive like that for much longer I'll soon be out of fuel. I thought this phenomenon might be the product of some bored Rover engineers' errant creativity, but how knows. Cheers Leander |
20th April 2010, 06:23 | #9 | |
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Quote:
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20th April 2010, 14:49 | #10 |
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If you notice, the only people that report this "problem" drive CDT/CDTi's
This happens on my fathers 75 CDT and my ZT CDTi and a number of others. I'm not sure if this is down to BMW algorithms with the fuel gauge/tank range, but it appears to be normal behavior. |
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