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#1
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Crap! Gas gauge acting funny again.
Well, after replacing the float sending unit in the tank of my '88 300CE it's acting funny again. I thoug it was fixed. When I'm getting low on gas, below a quarter tank it jumps back up to about a third of a tank. It seems to jump around between the acurate level and about a third of a tank. I thought I had the thing fixed. What could possibly be wrong? On advise from the MB dealer, I banged the dash a few times with my fist and the needle in the guage didn't budge. So he said it has to be the sending unit. Any advise?
Also, the low fuel light comes on when a quarter tank is remaining. Is this correct. It seems early. Thanks for you help. |
#2
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I thought this usually happens becuase of a bad ground connection in the trunk near the antenna?
Someone please correct me if I'm wrong. Thanks. |
#3
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If it was a bad ground then wouldn't it happen at more random times? Not just when it is below 1/4 tank? I am guessing sender, but I don't have knowledge of that specific car. I searched and found a thread "300CE fuel tank problems" but it is a little unclear what it is talking about. Might help you.
Mike
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra Last edited by mpolli; 04-27-2005 at 01:59 PM. |
#4
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Yeah, I have that too. Replaced the sender to no avail. Gave up.
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1986 300E 5-Speed 240k mi. |
#5
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I had a similar problem that resolved after using some redline fuel system cleaner, available at pep boys. since you replaced sending unit, your problem may be elsewhere.
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2005 Mercedes C230k sport sedan, 6 speed 1987 Porsche 924S - 968-engined track car |
#6
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Ditto. It wags all over the place below 1/2 tank, but the low-fuel light still comes on at the right time. I think it only happens while moving, so it seems it would be related to fuel sloshing around in the tank.
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1985 380SE Blue/Blue - 230,000 miles 2012 Subaru Forester 5-speed 2005 Toyota Sienna 2004 Chrysler Sebring convertible 1999 Toyota Tacoma |
#7
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I have a 1988 260E and the gas gauge works some of the time, then not at all for a while.
Any ideas? Thanks! |
#8
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Hmmm...lots of us have this bouncing gauge problem but I've never seen a fix posted. Our '91 bounces. Our '90 does not.
I swapped the sending units between the cars and it made no difference. I tightened the big ground on the driver's side of the trans and it helped some, but it's still not right.
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2012 E350 2006 Callaway SC560 |
#9
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I posted a fix that worked for me about 2 posts previously.
Quote:
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2005 Mercedes C230k sport sedan, 6 speed 1987 Porsche 924S - 968-engined track car |
#10
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I have fixed my 124 sending unit when the needle used to bounce around.
Pull unit out. Remove small nut on bottom and the outer cylinder will slide off. Inside you will see 3 parallel wires and a float. Squirt the wires with carb cleaner and reassemble. |
#11
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Small update. I have been putting 1/2 quart MMO into every other tank of gas for the last 2 months. The fuel gauge problem is almost completely resolved. I think MMO slowly cleans the gunk off the sender parts without having to disassemble and risk damage. It took 3 treatments to start seeing a change. I've used this stuff in rotary engines, which are somewhat delicate, so I have no qualms using it in a Benz. This may or may not work for your problem, but it can't hurt to try.
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1985 380SE Blue/Blue - 230,000 miles 2012 Subaru Forester 5-speed 2005 Toyota Sienna 2004 Chrysler Sebring convertible 1999 Toyota Tacoma |
#12
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it's a sender issue...... this has been a Mercedes issue for more years than you care to know about...
has not effect on the operation of the car... does kind of drive you nuts...I had it happen on a couple of Mercedes..I just used it as an opportunity to fill up the gas... Glad to hear MMO is helping.
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
#13
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Quote:
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2012 E350 2006 Callaway SC560 |
#14
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My 1991 300CE had the jumpy fuel needle usually between 1/4 and 1/2 levels. After reading the forum it seemed that there was no definitive fix even for those that replaced the sending unit. I started to occasionally use Techron and also keep the tank more often in the 1/2 to full area instead of my previous 0-1/2 full area and the problem went away.
glenmore 1991 300CE 1990 LS400 2000 C280 |
#15
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Mine does this as well on my W201. It has been posted on the 190Revolution forums that this is sometimes a ground in the cluster problem. Fixed by removing cluster and resoldering ground from the left side to the right side. Mine bounces under 1/2 tank, but if I tap the dash above the gauge it corrects itself for a few seconds. Basically long enough for me to see how much gas I have left. Mine will bounce all the way to a full tank and stay there when it only has 1/4 left! Too lazy to take the cluster out again as it is hot as hell outside....
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~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon..... |
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