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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
Fuel gauges are not meant to be precision instruments. You might want to fill up a 2 gallon can and drive the car until it runs out of fuel to see how low the gauge will go before it's really empty. Use the 2 gallons to get back to a filling station.
I once spent three working days trying to get a 1972 Chrysler to read full when it's full, half when it's half and quarter tank when the tank has a quarter amount of fuel. The customer did not want to accept anything else, but in the end all I did was to get close, not exact.
It is possible that the fuel float in the gas tank is "drowned", that is, the plastic float might have a slow leak and some fuel found its way inside. This will cause the float to submerge slightly and give you a low reading. To check this you will have to remove the float unit from the tank.
In any case, if you feel up the job (not easy) remove the float unit from the tank and manually move it up and down while checking the meter reading. You can bend the wire holding the float to correct misreadings.
Personally, I wouldn't bother, just be aware that when the reading is low, feel safe that you still have enough fuel to get to the next filling station.
1. Fill gas tank
2. Record odometer reading
3. Drive car as usual until 1/4 full.
4. Fill gas tank and record how many gallons it took to fill it again.
5. Record new odometer reading and subtract original reading.
6. Divide miles driven by gallons used.
To determine fuel mileage, you don't need to know the tank size. Fill the tank and write down the odometer reading. Drive a few days, then fill it again. Write down how many gallons it took to do that. (gallons are right on the pump at the station). Subtract the miles you first wrote down from the reading when you filled it the second time. That's how many miles you drove. Divide that number by the gallons you used and that tells you how many gallons it took per mile. So, if you drove 100miles and used 10 gallons, your mpg is 10. The capacity of the tank is not how many gallons you can use before you run out of fuel. All tanks have a space below the fuel pickup that contains one to three gallons of fuel you can't use. So, if planning a trip etc, figure your "range" on how many gallons it takes to fill it up from a pre-determined low reading on the gauge. ignoring the actual capacity. One tip: it's good practice to never permit any vehicle with an electric pump go much below 1/4 tank. The pump is cooled by the fuel in there and running low will cause it to run hot and shorten it's life.
With the information you've provided, one cam only imagine that you are obviously over filling the tank.
So this leads me to suspect that maybe (just maybe) your gas gauge is saying you are on empty, or 1/4 tank or a 1/2 tank whatever, etc. And you are wanting to make sure it is full.
I presume it always says this and that perhaps you need to have the sending unit replaced inside your fuel tank.
Otherwise, if all things are in working order and you meant to say that the Pump Nozle that the service station uses (where you fuel up) is not shutting off when your tank is full.
One of two things are happening,
In the case of a pump handle that has an auto lever, either they have a faulty pump nozle, in which case you need to talk with them about this.
It is a manual Nozle, in which case you are holding the lever personally and are over filling your tank...
It would be advisable to look up the total fuel capacity of your tank and make a note of approximately how many gallon are in it before fueling up.
This way, if you know there are say around 5 gallons and you have an 15 gallon tank.
Adding even 10 gallons you would be running the risk of over flowing since you are only estimating say 5 gallons at the beginning, maybe it is 5 1/2 or even closer to 6. Therefore only about 9 gallons could be added without over flowing...
Hopefully you'll have found something useful in this.
hi it can really only be two things, first is the fuel sender on the pump inside the tank it could be stuffed or sticking causing a false reading, second it can also be a faulty fuel gauge on the dash.
Find out how many gallons your fuel tank holds. Once it falls below a 1/4 tank and starts to shutter. Proceed to the nearest gas station and fill up. If you fill it up with 12 gallons and your tank holds 12 gallons then your fuel gauge is off. So it should be reading empty instead a 1/4 tank.
I had a similar problem only I was lucky enough that my gas gauge started working after it got lower than a 1/2 tank. It ended up being the float inside the tank. I ended up paying around $90 for the fuel float and it started reading the gas level correctly. But after 2 weeks and some severe cold weather, my engine wouldn't recieve any gas, ended up being the fuel pump. In buying the new fuel pump, along came a new float attached. So if your planning on replacing the float, go ahead and replace the whole pump, it will save you time, money, and hassle after its all over with.