Gas shoots out vent jet.

[johnrthomas]

I have a 1996 Merc 40hp. I rebuilt the carbs and when I pump the bulb gas shoots out the vent jet. Is somthing clogged, do I need to tear the carb apart or can I adjust something.

 

[sportsmanphil]

Re: Gas shoots out vent jet.

sounds like your inlet needles are not seating.

 

[verado7]

Re: Gas shoots out vent jet.

i second that .

 

[hkeiner]

Re: Gas shoots out vent jet.

After taking the carbs off again and fixing/adjusting the floats/jets and before reinstalling the carbs, turn the carbs upside down and blow into the fuel inlets. If you can blow air through the inlet, the jets are still not seating properly. This test may save you taking the carbs off a third time.

 

[johnrthomas]

Re: Gas shoots out vent jet.

Thanks for the help. I took it apart, cleaned it and it runs fine now.

 

[merc25rules]

Re: Gas shoots out vent jet.

I had this same problem...but my needle sits fine and my float lever seems to be working...i can not figure it out and am at wits end

 

[hkeiner]

Re: Gas shoots out vent jet.

If your motor has an erichener valve and it is stuck open, you will get fuel running into the lower carbs. Just a thought...