![]() Check valves at the pump's inlet and outlet control the direction of flow and the pressure within the pump chamber alternates between suction and pressure with every stroke. Mechanical fuel pumps are generally diaphragm pumps where the lever moves a diaphragm and an internal spring controls the mechanical pump's outlet pressure. From the mechanical fuel pump to the carburetor, the fuel line will absorb some heat from the hot environment surrounding the engine. Unless the fuel line is in close proximity to the exhaust system, gasoline gains very little heat as it moves from the gas tank to the fuel pump. The fuel systems in older cars commonly use a mechanical fuel pump mounted on the engine that is driven by a lever actuated by an eccentric cam on the camshaft. Using high-octane fuel when not necessary to control engine knock (pinging) can add a significant cost to running your vehicle and there are other solutions that work as well or better at a lower long-term cost. Try a couple of tanks of E0 to see if this improves your car's hot weather performance. See Ethanol-free gas stations in the U.S. Gasoline Volatility Information - Michigan Department of Agriculture and Rural Development Laboratory Division / Motor Fuels QualityĮthanol-free gasoline (ie, E0) is still available but usually as a high octane (91+) fuel.Gasoline Vapor Pressure Control - Cemda.Modern gasolines are comprised of a variety of hydrocarbon components, each with their own boiling points. Gasoline volatility is measured by its Reid Vapor Pressure (RVP). ![]() Petroleum companies vary the volatility of their gasolines according to the seasons as a trade-off between good vaporization and vapor lock. The vapor pressure of a liquid depends on its temperature and gasoline requires a low boiling point in order for it to easily vaporize once it is atomized by the carburetor. ![]() tires, paint, and interior component emissions, in other words, all emissions given off from a vehicle. This test is normally done in a sealed chamber and all emissions coming from the vehicle are measured. ![]()
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