![]() ![]() And this was on a standard 140 hp engine with a mechanical fuel pump and standard steel fuel lines. I have driven Corvairs across the desert in the middle of summer on very hot days and never experienced a vapor lock or heat soak problem. Vapor lock in a Corvair would be an unusual problem. The parts are shown on the following Clark's Corvair Parts page. If your insulators are missing this could be causing the carburetors to overheat as the cylinder heads reach normal operating temperature. Could this be a problem on your Corvair? The insulators and the associated gaskets are shown below.Įach thick insulator should be sandwiched between two paper gaskets under each carburetor. This would not be enough to insulate the carburetors from the cylinder head heat. Occasionally these insulators are left off following a carburetor removal, leaving only a thin paper gasket at the base of each carburetor. The plastic insulators between the carburetor gaskets at the base of each carburetor are intended to help block this heat transfer to the carburetors. It would occur if heat is able to transfer excessively from the hot aluminum intake manifold to the aluminum carburetor body, which could overheat the liquid fuel in the float bowls and other fuel passages within each carburetor. Heat buildup in the carburetors can cause a condition like vapor lock. Should a bubble form, the pressure from the tank can overcome the bubble, pushing any vapor on thru the system, exiting the carburetors as fumes. The fuel in the tank is usually a little cooler than metal tubes under the car being subject to heat radiating up from the ground. The note about putting a finger on the fuel pump with a bit of cold water, and then the car starts does not seem quite right.Įither of the cases mentioned above will usually be overcome with an electric fuel pump mounted near the tank, pushing the fuel. After a long hard hot run, the car is turned off, a situation called heat soak occurs, the fuel then boils away, then the engine will not fire up. When the bubble actually hits the fuel pump, the pump is unable push a non liquid form of gas, the fuel in the carburetors run dry, the engine does not run.Ī second form is if the carburetors actually get so warm that the fuel boils away. As the rear fuel pump lessens the pressure (partial vacuum), the atmospheric pressure on the fuel in the tank tries to push the fuel toward the engine. With the car stopped over a very warm asphalt parking lot, the fuel forms a bubble in the line under the car. This happens in Corvairs, but usually the vapor bubble is formed in the fuel line under the car. Depending on where the vapor form exists in the fuel lines, could cause the engine to not run do to lack of fuel. The term "vapor lock" refers to a heat build up in a fuel line, enough heat to cause the fuel to actually change from liquid form, to a vapor form. ![]()
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