 | Home > Puma (Tdci) > Low power between 4th and 5th |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16879   
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The pick-up is always the same place so it doesn't really matter where it is! It doesn't get lower as the fuel level drops.
The non-linearity of the gauge is due to the coil winding in the sender. My original (2007) sender started very slowly then dropped like a stone, the replacement (genuine) sender I fitted when rust split the original is perfectly linear and much better, 100 miles equates to any quarter of the tank. It makes me think LR may have improved them, or else it's totally random and I was just lucky with the replacement. |
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2nd Feb 2024 6:30pm |
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| roche1800 Member Since: 07 Apr 2020 Location: derbyshire Posts: 242 |
The update is as follows. The fuel gauge does not work, so when it’s running out it goes into a spluttering “safe limp” mode.
Putting more fuel in fixes the problem BUT now need to find the problem with the gauge or sender unit!! |
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6th Feb 2024 10:37am |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3209  
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I am not sure if it is an internet myth, but it comes from old days that have gone by. Especially on carburated petrol engines, the carb is generally full of fuel, so the fuel pump only need to replenish what is being consumed under that specific load, generally not a lot unless you have a fuel guzzler 😂 However when there is not enough fuel, the float in the carb will get low, and the demand on the fuel pump gets automatically higher, so there is more sucking, which could lead to pickup of contaminants that were building up while flow requirements were low. But nowadays all fuel systems have good filtration, and this should not be an issue anymore. But on the same low fuel topic, many euro5, hence dpf equipped cars will not regenerate the dpf when low on fuel, to conserve fuel. I do not know if the 2.2 is equipped with this feature. I always run mine itill the amber light (and the chime sounds) as that gives the least trips to the fuel pump  (conservation of fuel again). 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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6th Feb 2024 11:44am |
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| roche1800 Member Since: 07 Apr 2020 Location: derbyshire Posts: 242 |
The update is as follows for a fault code:
P0629 - 13 fuel pump A control Has anyone had this or know how to rectify the issue. Here is a photo from the garage:  Click image to enlarge |
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6th Mar 2024 4:10pm |
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| roche1800 Member Since: 07 Apr 2020 Location: derbyshire Posts: 242 |
The update is as follows for a fault code:
P0629 - 13 fuel pump A control Has anyone had this or know how to rectify the issue. Here is a photo from the garage: Click image to enlarge |
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6th Mar 2024 6:11pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19578
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These links may be of interest:
https://www.obd-codes.com/p0629 https://www.defender2.net/forum/post716817.html The second link may be of particular interest, as it is on here and as it’s a Defender may likely be the fix for the issue you have or at least some ideas. Based on a quick look for you.  Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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6th Mar 2024 10:43pm |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1765
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I’m pretty sure it’s either:-
1. The wiring from the tank fuel level sensor to the instrument cluster. 2. The instrument cluster connector 3. The tank sensor connector 4. The tank sensor 5. The instrument cluster. So you need to test the wiring first with a multimeter ( 2 wires) from Instrument cluster (IPAC) to tank sensor First test the sensor resistance from the IPAC connector, so unplug the connector and test across the two pins. See topic I’ve highlighted below as Martin provides pin details , resistance etc If not getting correct resistance then you need to check individual wires from sensor to ipac connector. Note you will need to drop tank to undertake wire continuity tests and sensor connector tests, and on a 90 it’s a difficult job. If the tests prove wiring, sensor and connectors are ok then you will need to get the Instrument cluster tested. Just found this topic on testing the sender wiring etc https://www.defender2.net/forum/post971540.html. Post from Martin states resistance for the 2.2 sender is 50 Ohms full, 1000 Ohms empty. |
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6th Mar 2024 11:26pm |
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| roche1800 Member Since: 07 Apr 2020 Location: derbyshire Posts: 242 |
The pump/sender had signs of swarf, replaced and codes cleared and everything is now perfect.
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26th Apr 2024 9:36am |
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