The difference in these two measurements can be then used to get a very accurate indication of fuel. As the capacitor is drenched in fuel, there is an increase in current, which is compared to a reference capacitor with air as a dielectric. This is because, at a given time, the dielectric constant can either be air, fuel, or a mixture of air and fuel. The first three of these factors (voltage, frequency, and plate size) remain fixed, and the only factor that changes is the dielectric constant. But you may need to change some parts anyway.The current flow in such a circuit depends on four factors. If you “top off” your tank, I recommend discontinuing this practice. Sometimes cleaning of the orifice in the throttle body through which the gas fumes are drawn from the charcoal canister might work, but I wouldn’t get optimistic about that one. The solution is to either change the charcoal canister or the purge valve/solenoid assembly. The two primary causes of this are (1) “topping off” the gas tank after the handle shuts off, and (2) malfunction of the “purge valve” or its solenoid, preventing the engine from evacuating the charcoal bed as the engine runs. If your charcoal bed becomes saturated with liquid fuel, it can prevent the gas tank from breathing in and allow a vacuum to develop in the tank’s air space that can cause the pump to be unable to maintain adequate pressure in the fuel line to the engine. The fumes captured by the charcoal bed are then drawn into your engine as it runs through a solenoid-operated “purge valve”. You have a line that runs through the activated charcoal and to a small orifice next to your gas fill hole that allows the tank to breath out without venting gas fumes to the atmosphere (the charcoal captures the hydrocarbon molecules) and to breath in as gas is pumped out as well. Your gas tank breaths in trough through the charcoal bed as the fuel is pumped out.
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