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How is it that the previous contributor of the posed question has the nerve to submit an answer when he doesn't have the slightest clue as to what he is referring to?!?!? First, the FUEL LEVEL is actually measured through the use of a nifty little item called a FUEL LEVEL SENDER which is attached to one (sometimes two) floats which are usually attached to the fuel pump canister. Next, the PROPER answer to the posed question: The fuel tank pressure (FTP) sensor or inline fuel tank pressure (FTP) sensor is used to measure the fuel tank pressure during the EVAP monitor test on vehicles equipped with the Running Loss-type (returnless style) system. Also, when the PCM receives a signal that there is excessive fuel tank pressure, it will force the system to purge.

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Q: What does a fuel tank pressure sensor do?
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