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carb is leaking the fuel out of the fuel bowls when it sits, you need to have the carb rebuilt or get a new one.
on the fuel line running from the tank to the carb.
A seal, or hose is leaking or you have a cracked carb. Check the fuel filter and make sure it's not loose or cross threaded.
Fuel injected or Carb?
It probably has to do with the following: The one way valve is leaking. It is probably located in the carbeurator. It is allowing the float bowl to empty back into the tank down the fuel line.
From the factory the only fuel filter on it is installed in the carb. Remove the fuel line from the carb. At that same location, remove that housing on the front of the carb. It's the large nut. The fuel filter is located in that housing. If it's not a "stock" car and running a Q-jet then an aftermarket one can be installed just about anywhere.
Running rich- either due to computer or faulty fuel injectors or carb. adjustment
Carb.? Weak or bad accelerator pump? Fuel Injected? Perhaps bad injectors (leaking)
first off clean the fuel tank, replace the fuel filter, take the carb apart and clean it and then blow it our with compressed air, replace the spark plug, change the oil in the bottom end, grease moving parts. The alternative to cleaning the carb is to use seafoam or carb cleaner to clean the carb as it's running. You can also decarbon the motor by running a concentration of gas, oil and seafoam into the carb
Your Engine is running to rich. Depending on the year and type of vehicle,would make troubleshooting easier. Bad float in carb, leaking injector, fuel pressure regulator, bad 02 sensor, mass sensor and more. Is running and coming out, or cranking not starting and coming out, all makes a difference to troubleshoot.
Carb.? At the front lower section of engine - follow the fuel line from carb. Fuel injected? In the fuel tank Carb.? At the front lower section of engine - follow the fuel line from carb. Fuel injected? In the fuel tank
Carb.? On the inlet fuel line to the carb.