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#1
10-20-2010, 08:45 PM
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Fuel Sender / Gauge
Is there ANY way to bring some accuracy to the Fuel Indicator!? If there's one thing about my car that annoys the hell out of my is my phantom quarter tank of fuel.
__________________
RIP: 80 300SD RIP: 79 450SEL 2002 E430 4matic (212,000km) 2002 ML500 'sport'  ____________________________ FACEBOOK: PANZER450 
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#2
10-21-2010, 09:35 AM
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I had this problem sometime after installing a NEW sender unit. to ascertain if it was sticking i removed and cleaned the delicate resistence wires and the guide rod ,sprayed ly with a silicone based lubricant and all is well. i assume there is accumulated moisture in the fuel tank causing micro rusting. in my 111 i simply added some ATF to fuel and it worked
mak 300se 103
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#3
10-21-2010, 09:40 AM
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Yes - cleaning the sender unit can help.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#5
10-21-2010, 11:20 AM
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cleaning is all you can do, even in the best case , I dont think they are very accurate , the mechanism design limits it being precise
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#6
10-21-2010, 07:31 PM
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Out of curriosity can someone tell me the socket size to remove the fuel sender from a W123 wagon?
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#7
10-21-2010, 08:52 PM
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I cleaned mine and nothing changed. Even though everyone said the sending unit was the issue. Granted its been proven it can be. So of course start there. But it not, remove the gauge cluster.
Easy to do, just search for directions. Once you get down to the fuel cluster and its removed you may see some resistors and a potentiometer (small dial). At least this is how it is in my 91 560SEL. After soldering EVERY part of the cluster I have gone back and just done the resistors and the pot again. Every time I solder it gets better. But I think the pot and resistors are shot. If I look at the uncoated side of the board it looks baked. Others have noted that also. Also the gauge may be more accurate when just starting out then as things get warm the gauge may jump up to a higher level. So since I can no longer get it any better, next step is to replace them. But one thing was clear, cleaning the sending unit did nothing and soldering the cluster did lots. So logic would say that sometimes its the cluster. After all, re-soldering stuff work very well for most VDO stuff it seems.
__________________
1991 560 SEL / 185k miles 1992 750il / 17k miles - project car
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