My fuel gauge is saying my vehicle is low on fuel, and I go to fill up, it only takes 13-15 gallons. I know these vehicles have a 22.5 gallons. So what can I do to get the fuel gauge to read properly?
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.
SOURCE: mercury mountaineer fuel gauge
its either the sending unit or the gauge or the unit inside the gas tank
SOURCE: 2004 Mercury Mountaineer fuel gauge not working
The most likely failure that will cause your problem is the fuel level sender in the gas tank. The sender will cause both the fuel gauge problem and the check engine light to be turned on. The sender will need to be replaced to repair the problem.
SOURCE: Where is the fuel filter located at on a 2006 Mercury Mountaineer
it should be on the inside of the frame rail
SOURCE: where is 2005 mercury mountaineer fuel filter
Fuel filters can usually be found on the drivers side under carriage about middle of the vehicle. There should be a canister type filter with 2 metal lines connected to it. One on both sides of the canister. you will need to disconnect both lines and the bracket that holds the filter in place and install the new filter. I do suggest that you remove the fuel cap to try and relieve some of the fuel pressure built up in the lines before disconnecting the filter so you won't be sprayed too much with fuel. If you have any other questions please do not hestitate to ask.
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SOURCE: 2006 Mercury Mountaineer Fueling Problem When
This is caused by the fact that the air that must be expelled from the tank when you fill it in has no other place to go but thru the nozzle pipe - most likely because the air tube to the carbon cannister is closed by the valve or the cannister itself is clogged. The easiest way to fix that is to just take out the tube to the cannister and leave it in the open - but you will loose some fuel thru evaporation (what the cannister was designed to prevent).
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