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Old 01-10-2018, 10:39 AM   #1
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Erratic Fuel Gauge

Class A Freightliner chases. Fuel gauge has begun to float from full to empty, to half & quarter. All over the place. Anyone have an issue like this. It began when someone stole one of my fuel caps. The cap has been replaced but problem still exists. HLM
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Old 01-10-2018, 11:01 AM   #2
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Did you loose a my fuel when you lost the cap? Possible someone stuck a hose in your tank and screwed up the sensor?!
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Old 01-10-2018, 04:24 PM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

I would check the connections at the sending unit on the fuel tank.

Good luck, happy trails, and God bless!
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Old 01-11-2018, 08:48 AM   #4
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Originally Posted by gerdutch View Post
Did you loose a my fuel when you lost the cap? Possible someone stuck a hose in your tank and screwed up the sensor?!
No fuel was missing - the campground where I suspect the gas cap was taken is wide open which would be very hard for someone to steal fuel and not be noticed.
My first analysis was IF the tank is pressurized then one cap missing would screw up the readings. Strange that this would happen same time cap was missing.
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Old 01-11-2018, 08:53 AM   #5
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Quote:
Originally Posted by gerdutch View Post
Did you loose a my fuel when you lost the cap? Possible someone stuck a hose in your tank and screwed up the sensor?!
Or dropped the hose into the tank interfering with the sending unit float.

lesmyers- Welcome to IRV2. Post the make and model of your RV, someone may be more familiar with a problem specific to your RV.
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Old 01-11-2018, 08:54 AM   #6
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Ground at gauge, connection at gauge, wire to sending unit, connection at sending unit, sending unit itself. The tanks breath so any cap will work.

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Old 01-11-2018, 08:55 AM   #7
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2010 Freightliner chassis here, and I'm having the same issue. No definitive diagnosis yet but right now I'm leaning toward the sensor/sensor connections because in my case at least, the needle still goes through times of reading accurately.
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Old 01-12-2018, 09:49 AM   #8
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Originally Posted by OLYLEN View Post
Ground at gauge, connection at gauge, wire to sending unit, connection at sending unit, sending unit itself. The tanks breath so any cap will work.

LEN
Thanks for the info. I will have to have my mechanic check on the connections. One other post says they are having the same issue themselves. My gauge does read correctly some times. Its reading full currently which is correct. HLM
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Old 01-12-2018, 10:09 AM   #9
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Originally Posted by muleman1 View Post
2010 Freightliner chassis here, and I'm having the same issue. No definitive diagnosis yet but right now I'm leaning toward the sensor/sensor connections because in my case at least, the needle still goes through times of reading accurately.
Hey Muleman, I now have the tank full and the gauge is reading accurately. I have some connections to check out to determine if that is the issue. I will get back to you if that truly is the case, HLM
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