Fuel Gauge issues
#1
Junior Member
Thread Starter
Fuel Gauge issues
I recently picked up an E55 and the gas gauge has always read between a full tank and 3/4 of a tank. Never less or accurate.Sometime will read full tank sometimes 3/4... The previous owner told me that after they installed the tank update that the gauge never worked properly afterwards.
So I've been told this could be due to them installing the tank wrong and possible the floats sticking.
Does this sound likely or am i looking at a sending unit replacement? I plan on taking it apart tomorrow. Anything specific i should look for while im in there?
SO UPDATE
I took the tank apart and everything looked okay. Installed the pump and everything back in. Now it will only show between 1/2 and 1/4 of a tank..When i first put it back in it was showing my my fuel light was on and that it needed gas. So went to the pump and put 10 gallons in and it put it right at half a tank. Got out and pumped again until it stopped pumping and when i went back in still showing half a tank??? Any ideas??
So I've been told this could be due to them installing the tank wrong and possible the floats sticking.
Does this sound likely or am i looking at a sending unit replacement? I plan on taking it apart tomorrow. Anything specific i should look for while im in there?
SO UPDATE
I took the tank apart and everything looked okay. Installed the pump and everything back in. Now it will only show between 1/2 and 1/4 of a tank..When i first put it back in it was showing my my fuel light was on and that it needed gas. So went to the pump and put 10 gallons in and it put it right at half a tank. Got out and pumped again until it stopped pumping and when i went back in still showing half a tank??? Any ideas??
Last edited by Drew Durham; 01-09-2019 at 02:04 PM.
#2
Senior Member
Sounds like the float arm is getting held up by a hose or wire. I'd check the driver side tank float arm (on the filter) first. Be sure to post the fix when your done
Last edited by Pmarino; 01-03-2019 at 06:49 PM.
#3
Junior Member
Thread Starter
I know a few techs that work at MB and they all said they think its a float stuck from someone not installing correctly. I'll post pics and info on what i find tomorrow.
Last edited by Drew Durham; 01-03-2019 at 04:45 PM.
#6
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#7
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'99 and '05 E55 AMG
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#8
Senior Member
Sorry thought you were aware of what Barry posted.It's much easier to work on the fuel tank with minimal fuel in it. You're not going to be able to see much unless you siphon (or pump) out the gas first. It's a little easier to siphon with the car's airmatic fully raised It's a stinky and somewhat dangerous job (especially performed in a closed space). Gasoline vapors are quite explosive, please be careful.
Last edited by Pmarino; 01-11-2019 at 01:48 AM.
#9
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Alternatively, pull the panel on the passenger side of the trunk, jumper the fuel pump relay while you have a bleed line attached to the Schraeder valve on the front of the fuel rail in the engine compartment. This post has a pdf showing which two connectors to jumper (pins 30 and 87): https://mbworld.org/forums/w211-amg/...ml#post7284235
FWIW, last time I was lazy and drove my car til I had three bars on the fuel gauge and I still had way too much fuel in the tank when I pulled off the covers. Like pmarino says, drain that tank.
FWIW, last time I was lazy and drove my car til I had three bars on the fuel gauge and I still had way too much fuel in the tank when I pulled off the covers. Like pmarino says, drain that tank.
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Pmarino (01-11-2019)
#10
Senior Member
Alternatively, pull the panel on the passenger side of the trunk, jumper the fuel pump relay while you have a bleed line attached to the Schraeder valve on the front of the fuel rail in the engine compartment. This post has a pdf showing which two connectors to jumper (pins 30 and 87): https://mbworld.org/forums/w211-amg/668117-w211-e55-fuel-pump-relay-fuse-maintenance-2.html#post7284235