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Message: <blockquote data-quote="GOM" data-source="post: 109046" data-attributes="member: 17510"><p>Also consider that the accelerator pump enriches the fuel mixture when the governor opens the throttle quickly (as when the load on the engine suddenly increases.) The accelerator pump "squirts" a tiny stream of fuel into the carburetor throat to get the engine transitioned to the higher load condition. If it is weak or not working at all, the engine probably will run relatively well under no load, but, as you indicated, needs to be eased into a heavier load condition gradually or it will bog down or stall altogether. The accelerator pump is a small plunger pump inside the carburetor, actuated as I recall, by an external linkage on the side of the carburetor facing you as you look at the engine. You might be able to see if it is functioning by disconnecting the throttle linkage and WITH THE ENGINE NOT RUNNING looking down the carburetor throat with a mirror as you quickly move the throttle from closed to open to see if a small stream of gas appears from the side of the throttle bore. Never get your hands or eyes near the top of the carburetor when the engine is running to perform this test because a lean running engine can backfire quite a tall flame straight up when accelerated quickly. Ethanol in our modern fuel tends to degrade soft parts like the accelerator pump diaphragm or plunger on many of these older machines. Just one more idea to consider.</p></blockquote><p></p>

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