gas tank vent

[spilon]

Hi all,
stupid question maybe,

I have a four winns 170 freedom, it starts like a dream and runs good, until it's put in neutral then it stalls out and will not re-start till its cool.
To me it sounds like it is starving for gas by the way it turns over.
so, looking into some past forms, I hear about vapor lock.

here is my question,
if I blow into the vent port, should it make the gas in the tank make a bubbling noise or should it just pass through un-restricted and push air back out through the fill line

and vise versa if I blow into the tank, should the air pass through the vent tube un-restricted

thanks
Steve

 

[alldodge]

Re: gas tank vent

Going to start with the questions your not asking first;
Engine runs like a dream until it is put in neutral - The OMC has an engine interuptor which interupts the ignition during shifting. If the interuptor malfuctions the engine dies. Has the circuit been checked.

Sounds like it is starving for gas - What do you mean by this? When its running does it have trouble running or does it act like it will not start because it needs gas?

Gas tanks have antisiphone valve and if the valve is sticking the engine will have some to great difficulity running.

The gas vent tube should allow air out easier then in, kind of a one way valve without much attitude . Air going in the tank fill should come out with more ease then the other way due to a flapper type valve.

 

[Boomyal]

Re: gas tank vent

No where do I see the vintage of your OMC mentioned. They never had 'engine interrupters' until 1982. Furthermore, your gas tank air vent enters the tank at the very top of the tank, so depending on how much gas you had in the tank, blowing into the vent would induce air above the fuel level and not cause bubbling. However, bubbling or not, there should be no resistance when you blow into the vent.