Blowing gas out the carburetor

Hi,

If it is dumping fuel out of the carburetor, the float is likely stuck or not properly set. The float is what stops the fuel from entering the carburetor when it reaches a specific level in the float bowl. If that is exceeded, then you will have flooding, and the pump will continue to add fuel and it will have no place to go.

Take a screwdriver handle and lightly tap on the side of the carburetor near where the fuel line enters. Sometimes that will release a stuck float.

If that doesn't help, here are directions for adjusting the float level:

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1985 Nissan-Datsun Truck PL720 2WD L4-2389cc 2.4L SOHC (Z24)
Float & Fuel Level, Adjust
Vehicle Power-train Management Fuel Delivery and Air Induction Carburetor Carburetor Float Adjustments Float & Fuel Level, Adjust
FLOAT & FUEL LEVEL, ADJUST
Fig. 10 Float level adjustment.

See pic 1

Fig. 11 Fuel level adjustment.

See pic 2

1. With engine idling, visually check fuel level through sight window of float chamber. Fuel level is correct if it is at indicator point. If fuel level is not correct proceed to the next step.

2. Invert float chamber to allow float to come into contact with needle valve, and measure clearance ``H, '' Fig. 10. Clearance should be as listed in the specifications chart. The top float position can be adjusted by bending float seat.

3. Adjust bottom float position so that clearance ``h'' between float seat and needle valve stem, Fig. 10, is as listed in the specifications chart when float is fully raised. Bend float stopper as required.

4. After adjustments in steps 1 and 2 have been made, make sure that when fuel is delivered to the float chamber, the fuel level is maintained at.91 inch, Fig. 11.

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Please understand, this is the first thing that comes to mind based on your description. The only other thing I can think of is if the float is bad (basically doesn't float and shut the fuel from entering). Let me know if this helps or if you have other questions.

Take care,
Joe