- Warm up your engine
- Turn it off
- Remove air cleaner
- Choke valve should be open – if not it could be stuck on the fast idle. Open the throttle a small amount which may allow it to open.
- Pump your throttle to wide open watching the inside of the carburetor bore.
- You should immediately see a stream, or streams of gas squirting in the throat. 1 barrel will have 1 stream, 2 & 4 barrels will have 2 streams. Some 4 barrels will pump gas in both primary & secondary bores. These will have 2 accelerator pumps.
Possible issues:
- Main discharge could be missing the check valve (check ball, or check weight)
- Passage from the pump well to the main discharge may be plugged.
- Accelerator pump well may not be filling up completely.
- Check valve is dirty, or missing (check ball usually). Some carburetors don’t use a check valve. They are filled over the top of the accelerator pump well.
- Accelerator pump deteriorated, or it’s the wrong pump.
- Accelerator pump installed incorrectly.
