When i drive my van a 98 r reg escort 55 1.8d the fuel gauge moves to empty even though i have just filled it up, when dont accelerate it moves back towards full but cant decide where it wants to be, it wont work as normal...
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Re: fuel gauge problem
Yes the sending unit is defective, to replace it remove the back seat cushion, under it u will find a sheet metal plate, remove this plate and u will find the access plate on the top of the fuel tank, undo the retaining ring with a brass drift or wood mallet (don't use anything with iron or steel u may cause a fire), remove the sending unit/fuel pump module and reverse to reinstall. Be careful to not break the fuel module connector on the top of tank, also make sure you have less than 1/2 tank of gas or it will spill all over when u remove the sender.
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If your fuel gauge is showing you in accurate readings this is normal to all vehicles that are not used to fill-up gas full regularly but sometimes the cause of the inacuracy is due to faulty float valve in the gas tank you need to replace it
It's not the transmission, because you wouldn't see the space that the transmission fluid fills, and it's doubtful that it's the brake fluid, the brakes will act up all the time (stop lights, etc) if that were the case, so it must be the powersteering fluid. If your car is sort of a pain to steer around corners, the slower you go, the harder it is to move the wheel to turn, and you hear a sort of whiney noise when you get into a deep turn, or are turning slowly, that would for sure be powersteering.
suspect it could be tank unit this is similar to a ball valve in a toilet .float arm moves up or down depending on fuel level sends reading to gauge situated in fuel tank sometimes part of the fuel pump
see if there is any acces to the fuel tank cover under the rear seat, if it is then remove the screws and remove the sending unit sending unit inside the tank most likelly it will be bad, but if you don't feel like doing it, then take it to your mechanic but seems to be the sending unit inside the tank wich is the sensor trigering your gage is not good and need to be tested and replaced