Carburetor spitting gas?

Question

have a 1976 evinrude 70 hp.at about half throttle the middle carburetor start to spit gas.place my hand over the carb. opening and the spitting stop.also the engine open on up and run good.amy advice will be helpful.may be reed values.also when i use the choke fuel shoots out of the same carb.thank you kindly,san

Answer 1

Float out of adj or trash in the needle seat>Something went in the reeds and is holding it open>

Answer 2

In a 2 stroke 70H.P Veinrude, the spitting of fuel back through the carb can be caused by excessive fuel - a carb problem- and/or a reed valve problem.  It can also be an early indicator of engine failure.... compression leaking by rings that are failing and are gouging the cylinder wall.  A problem which plaged the 3 cylinder Evinrudes.  So, carefully check each of these areas and make repairs as needed.  Good Luck!!!!

Answer 3

If its a reed valve motor, you could have a broken or completely fatigued red valve allowing reversion(leakage of pressure meant to be used for forcing air and fuel through the transfer ports) I would check the reeds too make sure they are all there and close completely. The only other thing that could be causing this is a stuck float in one of the carbs, allowing fuel to overflow through the jets even when they are not getting a vacuum signal

Answer 4

Any time you see a motor that is spitting gas back out of the carb you

have a reed problem.If it is only leaking gas then it is probably a carb problem.9 out of 10 times when you have fuel spitting out of the carb you will find that you have a broken reed valve.Good luck.