My fuel gauge isnt working at first it wasnt working due to the fuel tank sending unit which was replaced. After that it was working perfectly fine after a while it suddenly started to not work. it will work for a moment and the service now lights and fasten belts chime and light come on then it will switch to the washer fluid lights on and the fuel gauge wont work. i believe the problem could be electrical but have no clue

SOURCE: 91 deville fuel gauge flashes "E"

It seems that you are low on fuel based on you saying 70 miles in the range gauge. If this problem does not happen with 3 gallons of fuel or more then it is normal. The range is calculated on your average MPG and gallons of fuel in the tank. When the car gets to around 2 gallons it does not chance miscalculating your miles to empty and leave you on the side of the road. At this point he tank will read "E" to let you know it is time to fuel up. The flashing "E" is simply cadillac's way to get your attention that you are in fact low on fuel and need to take action. Hope this helps.

SOURCE: fuse check ,now car dead

check body fuse and interior lights fuse. If body fuse blows certain interior light STAY ON and kill the battery, therefore NO START snd s dsrk dash. Firrst we have charge the battery. Replace blown fuses. Now why did the fuse blow ? I found plenty of dimes in the cigarette lighter socket. Rear ones too. Hope it helps

SOURCE: Erratic Gas Gauge

You need to remove the tank and replace the fuel pump as the sending unit is part of the pump assembly.

SOURCE: fuel gauge works but it says check fuel gauge on

no that would not cause a smog failure

SOURCE: Car goes berzerk

did it do this befor the other parts were replaced. sounds like some wires touching or grounding out.