Its conceivable you can diagnose the fault and identify the faulty sensor if you have the right equipment . Asking for internet guesses is unlikely to be productive. Since the left sensor is cheaper to buy Id gamble on replacing that first and then observe the result. As a preliminary step you may want to consider cleaning through abrasion the electrical contacts to the sensor units. Over time oxidation and dirt may prevent reliable transmission of electrical signals.
How do I measure the resistance levels
Before moving anything have you tried monitoring the data available via the hidden OBC functions IIRC function 6.0 lets you see the data being received from each fuel level sensor maybe this can help you infer which sensor is nuts
Use the OBD functions as already mentioned. httpwww.bimmerboard.comforumsposts114795 With the full tank I believe the reading should read a series of 6 digits which is the volume of fuel in the left and right side of the fuel tank in liters. For example when full it will read (280 330) (24 liters30 liters) when full. Only the left side of the tank should show a steady decrease in volume as you burn
Quote Originally Posted by jM2.me Only recently I found out that both fuel tank sections have level sensors so I decided to check readings using hidden cluster test functions. Surely enough I got a reading of 000278 for test 6.0 (its on bmw wiki). There is no reading from left sensor what so ever. How reliable are these readings Since left sensor shows no values can I be sure that its the drivers side
Quote Originally Posted by MalibuMafiaV Yeah I was going to suggest a Walbro 255. Ive had one sitting in my storage for like a year.... I really need to install it because at the moment I have fuel issues when at full boost high rpms..... Which I kind of find odd... I only have 42lb injectors... A year ago I too thought about buying walbro and replace pump only. Lucky I found great deal on new fuel
Its under 30 today again but I found some things probably bad things. I checked the resistance reading with multimeter. On M3 assambly that I have 60ohm resistance when tank is supposedly empty and 360ohm when full. When I first measured drivers side level sensor I got 67ohm. Doesnt sound right since I just filled it up with 12 gallons. First thing that threw me off was tubing which seems to be non-oem
Here is a final update. fuel light finally came on which meant it was the time to look at fuel pump and level sensors. As mentioned in previous post fuel level sensor on drivers side was stuck between feed line and feed line support. I disconnected the feed line which allowed me to take out the assembly out. Now here is a surprise the fuel level card looked like brand a brand new one not a single sign
First of all Id keep taking it back to the same dealer. If you think they lied mark the sensors. I think theyre easily accessible from under the rear seat. I dont think the sensors should read the same when the car is sitting still. Which sensor reads more depends on which way you turned before you shut the car off. If you turned left more fuel probably sloshed into the right tank and vise-versa...
I think I had a problem after getting the car out of winter storage with fuel indicator not reading correctly. I ran two tanks of fuel with bmw fuel additive and no problem. Ive since added another bottle and Ill probly add a bottle to a full tank when I put it up this winter for a time. It is rumored this helps the sensors. Hope so...
I had the same problem on my 540i. Sender on the fuel pickup side has probably gone out. If you have the high dash you can check the sender readings using the diagnostic mode. It could be something simple like a broken wire on the sender. Wait till the fuel is low then pull the sender out of the tank. If there are no broken wires you will need a replacement
Quote If you have the high dash you can check the sender readings using the diagnostic mode. You can do the same with the low cluster too. Its the same TEST 6...its just that that the read out is slightly different due to the low cluster not having the 20 digit alphanumeric display. The cluster needs to be UNLOCKED first then run TEST 6...and you can find out if one of the fuel level sensors is not
Quote Originally Posted by Burning2nd This is a reason why you should fill and empty the tank.. Useing the intire range of the sending unit..not just the upper half or Please expand on this statement. Are you suggesting that failing to run the fuel tank to empty (or near empty) causes the fuel level sensor to fail Sent from BimmerApp mobile app
(or near empty) causes the fuel level sensor to fail Sent from BimmerApp mobile app yep thats what im saying.. or at least if you want to look at it that way for the simplisity of the situation.. If you dont use the full range of the sending unit.. you will be replacing it.. fill the tank.. run it till the light comes on.. fill it... run it till the light comes on 196k 183k 121 465k on my 4 bmw
1 Youll have no problem. Gauge only function is to let you know the fuel level.
Go here for part numbers www.realoem.com . There are two sensors one for each side of the tank. The cluster electronics calculates the amount in each side and deflects the fuel gauge accordingly. I doubt it makes a difference whether you have aux heating but go here to see the oprions installed on your car httpwww.rubmw.ruvincodeeng
Quote Originally Posted by smolck This should help. httpforum.e46fanatics.comshowthread.phpt592414 Well it kinda does. SO I guess I will be replacing fuel pump (driver side) and level sensor (passanger side). Would love to see some info about how that works.
Mine was replaced and I had the same problem it would not peg. Would go just above 34. Was leaving on a trip when I discovered it with no time to fix before I left. On the trip I also found that it did not go down in a linear fashion. Also on the trip a break wear sensor fell off and was ground up by the wheel. That prompted a stop in California where the break sensor was replaced and they found a
I had the fuel sensor repair done today and had no problem with the gauge when filling up the tank immediately afterwards.
Quote Originally Posted by bbmertz I had the fuel sensor repair done today and had no problem with the gauge when filling up the tank immediately afterwards. So did the fuel gauge go all the way up or did it stop just before the full marker dashed line My car does that and I am not really sure if it needs the recall or not its a July built 550i.
My fuel gauge was replaced at the VPC about September 25 after doing bmw European delivery. When the tank is full it aligns perfectly with the full mark. It goes down in a linear fashion. It aligns perfectly with the empty mark the sensor reads that I have 0 miles to go before empty. If your fuel gauge does align perfectly on a bmw I would tell the dealer to get it fixed properly. What is the point
Many here have had success in treating malfunctioning fuel sensors with a couple of tanks with Techron fuel additive. It helps dissolve the deposits that cause the problem. Give it a try. It may take a few tanks but it does work. Make sure its Techron because other brands wont do it.
Update Intersting...the fuel gauge needle is very slowly creeping up towards the full mark and the range on the OBC is going up as well. Weird Sent from BimmerApp mobile app