CONDITION

     PROBABLE CAUSE

     CORRECTION

Gas pours out when the engine is running.
Note 1: often removing the carb from the manifold & shaking it hard a couple of times will effect a cure.
Note 2: if procedure in note 1 doesn’t cure it, the problems is almost always dirt or bad gas getting into the carb. Carb will then need to be disassembled to fix it.

1) Charcoal cannister is saturated with gas.
2) Vent valve is not functioning correctly.
3) Kinked hoses in venting system.
4) Stuck or blocked check valves in the vent hoses or elsewhere in the system.
5) Gas tank vent is blocked.
6) Gas line located too close to a heat source (such as a radiator hose or exhaust manifold).

1) Replace the charcoal cannister.
2) Replace the defective valve or fix other cause of it
3) Replace the kinked hoses with correct kind.
4) Replace the check valves.
5) Fix it or replace the gas cap if vent is in the cap.
6) This causes the fuel to expand & be forced past the needle & seat. Also, fuel can boil in the carb if there are improper or missing gaskets or spacers between the carb & manifold. A heat riser stuck in the closed position will also cause boiling and flooding.

Gas pours out when engine is turned off.

1) Dirt stuck on tip of the needle & seat.
2) Idle speed is set too fast.
3) Idle solenoid is not functioning.
4) Fuel pump pressure too high.
5) Fuel pressure is fluctuating or “pulsing” (common on Colts, Mitsubishi & other Chrysler imports).
6) Float is heavy or sunk.
7) Gas is very gummy, old, or has too much alcohol or other chemicals in it.
8) Sugar in the gas.
9) Choke not working.
10) Needle not seated properly during initial fill.
11) On Mikuni carb, the overturn ball fell out of place.
12) On carbs with externally adjustable float levels.

1) Clean the tip off carefully or replace the needle & seat and clean the entire fuel system out.
2) Reduce the idle speed to factory specs. If it will not idle slowly, the mixture is set too lean, or the idle solenoid is not functioning right, or there is a vacuum leak somewhere (usually not in the carb).
3) Check for power & ground up to the solenoid. Check the operation of the solenoid. Look for dirt stuck in the solenoid or the passageways to it.
4) Check pressure. Use a regulator to control the pressure or put on a new pump (don
5) Control pulsing with a regulator.
6) Replace float. Is often caused by spit-back up through carb.
7) Clean bad gas out of carb. Clean out of fuel system. Use only good quality gas.
8) Clean out the entire fuel system.
9) Check cause of choke failure, choke pull-off failure, or loss of heat to the choke.
10) Try tapping the fuel inlet or needle & seat area with the handle of a screwdriver. If this doesn
11) This is caused by the carb being overturned or turned on its side. Remove top and reinstall the ball.
12) Excessive adjustments have caused the seal to break. Replace the seals.