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Erratic Fuel Gauge
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CF Beginner
Joined: Jan 2007
Posts: 2
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Erratic Fuel Gauge
I have a 1999 2-door 4wd Tahoe. I just had the fuel pump replaced and when I got the truck back, the fuel gauge is now erratic. It moves back and forth like the blinker was on or something, but not back and forth too far , just slightly. It doesnt jump all over the place and its not too noticable during the day. When I am driving at night and the gauges are lit up, it almost looks like its vibrating back and forth extremely fast like a humming bird almost. Now the mechanic even replaced the 1st new fuel pump assembly w/sending unit and the same thing is happening. It even does this with the truck off and the key turned to the on position. It didnt do this before I had the pump replaced and now no one can figure it out. Any help would be greatly appreciated. Thanks...
CF Junior Member
Joined: Aug 2006
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RE: Erratic Fuel Gauge
are you sure you have the correct pump and sending unit cos a 99 Hoeis different than99 pickup truckyou probably have a new body style sending unit in there that uses different oms/volt??
to make sure just go back to parts store lookup 98 Tahoe part number and check to see if thats the same part you have in ur truck
to make sure just go back to parts store lookup 98 Tahoe part number and check to see if thats the same part you have in ur truck
CF Beginner
Joined: Jun 2007
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RE: Erratic Fuel Gauge
ORIGINAL: gamato
I have a 1999 2-door 4wd Tahoe. I just had the fuel pump replaced and when I got the truck back, the fuel gauge is now erratic. It moves back and forth like the blinker was on or something, but not back and forth too far , just slightly. It doesnt jump all over the place and its not too noticable during the day. When I am driving at night and the gauges are lit up, it almost looks like its vibrating back and forth extremely fast like a humming bird almost. Now the mechanic even replaced the 1st new fuel pump assembly w/sending unit and the same thing is happening. It even does this with the truck off and the key turned to the on position. It didnt do this before I had the pump replaced and now no one can figure it out. Any help would be greatly appreciated. Thanks...
I have a 1999 2-door 4wd Tahoe. I just had the fuel pump replaced and when I got the truck back, the fuel gauge is now erratic. It moves back and forth like the blinker was on or something, but not back and forth too far , just slightly. It doesnt jump all over the place and its not too noticable during the day. When I am driving at night and the gauges are lit up, it almost looks like its vibrating back and forth extremely fast like a humming bird almost. Now the mechanic even replaced the 1st new fuel pump assembly w/sending unit and the same thing is happening. It even does this with the truck off and the key turned to the on position. It didnt do this before I had the pump replaced and now no one can figure it out. Any help would be greatly appreciated. Thanks...
I noticed that in a reply from Black 5.3 that there are two different style sending units for the '99 year model. Have you been able to confirm that this was your issue? btw, the parts books that I have seen also called for a MU149 for the '98 models, but again perhaps the sending unit is different?
CF Beginner
Joined: Jun 2007
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RE: Erratic Fuel Gauge
I have a 2000 tahoe and the gas gauge started doing the same thing but after awhile it now goes from empty with the idiot light on to full then half full then quarter tankand all over the place. Its almost like I have a magic refilling gas tank. I have not had the fuel pump replaced so I know it not that.
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Joined: Jun 2007
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RE: Erratic Fuel Gauge
ORIGINAL: jhale
I have a 2000 tahoe and the gas gauge started doing the same thing but after awhile it now goes from empty with the idiot light on to full then half full then quarter tankand all over the place. Its almost like I have a magic refilling gas tank. I have not had the fuel pump replaced so I know it not that.
I have a 2000 tahoe and the gas gauge started doing the same thing but after awhile it now goes from empty with the idiot light on to full then half full then quarter tankand all over the place. Its almost like I have a magic refilling gas tank. I have not had the fuel pump replaced so I know it not that.
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CF Beginner
Joined: Mar 2010
Posts: 2
Likes: 0
Erratic Fuel gauge
I have a 1999 2-door 4wd Tahoe. I just had the fuel pump replaced and when I got the truck back, the fuel gauge is now erratic. It moves back and forth like the blinker was on or something, but not back and forth too far , just slightly. It doesnt jump all over the place and its not too noticable during the day. When I am driving at night and the gauges are lit up, it almost looks like its vibrating back and forth extremely fast like a humming bird almost. Now the mechanic even replaced the 1st new fuel pump assembly w/sending unit and the same thing is happening. It even does this with the truck off and the key turned to the on position. It didnt do this before I had the pump replaced and now no one can figure it out. Any help would be greatly appreciated. Thanks...
