Can' blow through the gas hose which connects to the motor

[John Drew98]

I replaced the bulb on the gas hose and had gas in the tank. Before connecting the bulb I tried to blow on the hose going into the tank but could not. Is there a backflow valve which prevents me for doing that or should there be no restriction?

 

[tomhath]

The check valve would be in the bulb.

How much gas in the tank? It would take a fair amount of pressure if the tank is full or nearly so.

 

[John Drew98]

That's probably what it is. I put in about 3 gals. Thanks

 

[dingbat]

Is there a backflow valve which prevents me for doing that or should there be no restriction?

There should be an anti-siphon valve useless your using a portable tank

 

[fishrdan]

If there is an anti-siphon valve as dingbat mentioned, you won't be able to "blow" through the hose and into the tank, since it has light spring seating a check ball. Something like a 2-3# spring to keep the fuel tank from siphoning, but light enough spring for the fuel pump to overcome the spring a pull fuel. When you try to blow in the hose, you're seating the check ball with more force.