![]() Next, race the motor for a moment and again observe the pressure reading on the gauge. Start the motor without racing it, and observe the pressure at idle speed. ![]() To test for fuel pressure, attach a pressure gauge to the output side of the fuel pump. If the seat is not too badly worn or damaged and is clean, the fuel level may be corrected by bending the lip of the float arm until the level is correct. As the valve becomes worn, the fuel level rises. Fuel level is controlled by both the float valve and the fuel pump pressure. High fuel pressure can account for high fuel levels, so the fuel pressure should be checked to make sure it is not excessive for any speed. This allows the pump to deliver fuel and see where the needle valve shuts it off. Make sure to drain down the fuel level in the bowl to about half. Power the electric fuel pump and check the fuel level with the top off the carb. Make sure the engine’s ignition system is OFF. You would bypass the mechanical fuel pump and run a line from a fuel tank directly to the carb inlet fitting. To do this you would have to set up an electric fuel pump (use a pressure regulator to keep within specified pressure range) to supply gas to the carburetor. Also, fuel levels will drop up to 1/4″ under high speed operation.Īnother method of testing the float level and needle valve is to perform the test without the engine running. It is also recommended that the fan belt should be loosened or removed for the test as the blast of air from the fan can affect the reading of the test. Note that the car should be level for this test. If a gauge like this is not available, a steel rule may be used instead, measuring from the top edge of the bowl, with its cover removed, to the top of the fuel itself. The level shown in the gauge is the same as that present in the fuel bowl. The engine was allowed to run at idle speed. A special gauge was used to check for fuel level (see Figure 3) which was placed in the fuel drain plug hole of the carburetors. The level of the fuel should be set to a distance of 15/32″ below the machined surface at the top of the fuel bowl (with the engine running at idle speed). ![]() The fuel level settings for the 97 or 81 Stromberg are 15/32″ minimum and 17/32″ maximum. Adjustment for altering the fuel level is made by bending the lip at C. The place to measure the fuel level is indicated at B. The idle fuel system for one of these dual Stromberg carburetors is shown below in Figure 1. A single fuel chamber is used and air is taken through one air passage. There are separate sets of venturi tubes, main metering systems, idle systems, throttle plates and pump discharge nozzles, and accelerating pumps. This carb was combined with the dual intake manifold so that each venturi fed half the cylinders of the engine. A slightly smaller version known as the “81” (Stromberg EE-7/8) was used on the smaller 60hp V8 engines from 1937 to 40. ![]() Stromberg identified it as their Model EE-1. Beginning in 1934 production, Ford started using the Stromberg dual carburetor commonly known as the “97” which referred to the nominal venturi size of 0.97″ diameter. Ford used the Detroit Lubricator single barrel carburetor on the early V8 engines for 19.
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