![]() Since January 1 of 2011, CARB and the EPA have required that all portable fuel systems manufactured for use with outboard motors follow a near-zero-emissions policy. Purchasing the correct length fuel line is critical to allow for the larger bend radius required with CARB/EPA fuel lines versus the older “rubber” fuel line assemblies. This additional layer causes fuel line assemblies to be less pliable and more susceptible to permanent kinking. In 2009 fuel lines and primer bulbs were redesigned to include a barrier layer to prevent evaporation. EPA Mandated Changes to Fuel Lines and Primer Bulbs Similarly, when there is an increase in the temperature, the fuel volume increases.EPA compliant primer bulb/fuel line assembly. Thus, when there is a drop in temperature, the fuel volume reduces and causes errors in fuel indication. The Specific Gravity (SG) or density of the fuel is inversely proportional to the temperature. ![]() The main problem with this system is that it cannot compensate for the temperature. 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. The current flow in such a circuit depends on four factors.
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