Posted by docmirror on February 05, 2019 at 12:58:10 from (107.213.165.255):
In Reply to: snowblower carb posted by gotmyfarm! on February 05, 2019 at 12:01:02:
Gas should not leak from anywhere. Most probable cause is a stuck float bowl in the flow position(all the way down, leaving the needle open).
try this:
1. Turn upside down. Locate the main mixture screw(shown in pic at the very bottom), with a gland nut and washer.
2. Unscrew the main mixture screw, including the spring and set aside.
3. Using a wrench, loosen the gland nut. Remove the nut and washer.
4. Gently pry the float bowl up and off the body of the carb. There will be a thin rubber seal around the edge of the float bowl, note the orientation of the rubber seal on the carb body.
5. You will see the float, and also the articulating pin that allows it to pivot up and down. There is a small tab with a needle valve attached or under that tab.
6. Pull the pivot pin sideways and set aside. Carefully lift off the float asm. The needle valve may come with it, or may remain inside the seat in the carb body.
7. If the needle has not come with the float, remove it from the brass(maybe) seat. Inspect the needle for damage on the tip, or corrosion anywhere along the shaft.
8. Spritz some carb cleaner down into the seat well.
9. Clean the float, inside the float bowl, and inspect the pivot pin, and pivot pin holder for corrosion. This must all be very clean. Be gentle with the float.
10. Once everything is clean, put the needle, and float back in place, and secure it with the pivot pin. The float will pivot up and down.
11. Test now. With the carb upside down, the float will press the needle into the seat and close off fuel flow. Try to blow into the fuel line port of the carb. You should not get any air flow.
11b. Turn the carb over, correct side up. Blow into the fuel line port again. The float should have pivoted, opening the needle and seat, and allowing air to flow. Repeat step 11 again, to insure it closes.
12. Install the rubber ring on the carb body base where the float bowl will attach.
13. Install the float bowl to the carb body, make sure you do not disturb the seal.
14. Install the gland nut, and if there was a washer install that back in the same orientation.
15. Install the main mixture screw and spring. Tighten all the way in, and then turn it back out 1-1/2 turns.
16. Set the carb back on the snowblower, attach the fuel line, open the fuel valve with fuel in the tank. You should NOT have fuel leaking out the back or front of the carb.
17. If that is all good, attach the nuts to the carb, install the air cleaner and throttle and choke lines.
18. Start the engine. You may need to leave the choke off to start as it is likely flooded with fuel.
19. Once the engine starts, you may need to adjust the main mixture on the bottom of the float bowl. Adjust inward until the engine begins to die out, then adjust it back outward for smooth running.
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