How do I check the accelerating pump on the carburetor?

After stopping the engine, make a visual check of the accelerating pump connecting rod and lever; if they are bent or twisted, replace them. Then turn the throttle lever and make sure fuel is smoothly injected from the injector located in the primary port.

What should I do if the accelerating pump is not functioning properly?

Check the pump piston and replace it if necessary.

What is done after adjusting clearance "A" on the carburetor?

Install the carburetor on the engine and check the engine speed.

Where is the accelerating pump injector located?

In the primary port of the carburetor.

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Nissan Micra Carburetor Accelerating Pump Inspection & Adjustment - EF & EC-17

Carburetor inspection and adjustment procedure with accelerating pump check figures

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Carburetor inspection and adjustment service procedure covering throttle and accelerating pump.

AI caption June 2005 · Photo 117 of 412

This is a page from a factory service manual section covering carburetor inspection and adjustment (continued). Step 4 instructs the mechanic to install the carburetor on the engine and check engine speed after adjusting clearance "A" (throttle valve clearance), accompanied by a diagram (SEF050D) labeling the carburetor body, fast idle adjusting screw, and throttle valve. The main topic is the ACCELERATING PUMP: step 1 directs a visual check of the accelerating pump connecting rod and lever after stopping the engine, with replacement if they are bent or twisted; an illustration (SEF051D) labels the accelerating pump connecting rod, lever, and piston. Step 2 says to turn the throttle lever and verify fuel is smoothly injected from the injector located in the primary port; if the accelerating pump is not functioning properly, the pump piston should be checked and replaced if necessary. A third illustration (SEF052D) shows the injector location viewed down the carburetor throat. The page carries the section footer "EF & EC-17" (Engine Fuel & Emission Control). A reader learns the procedure for verifying accelerating pump operation and fast idle adjustment on this carbureted engine.

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Frequently asked questions

How do I check the accelerating pump on the carburetor?: After stopping the engine, make a visual check of the accelerating pump connecting rod and lever; if they are bent or twisted, replace them. Then turn the throttle lever and make sure fuel is smoothly injected from the injector located in the primary port.
What should I do if the accelerating pump is not functioning properly?: Check the pump piston and replace it if necessary.
What is done after adjusting clearance "A" on the carburetor?: Install the carburetor on the engine and check the engine speed.
Where is the accelerating pump injector located?: In the primary port of the carburetor.