gas overflow

[bassfishin5]

I have a 79 ranger that this problem just recently started happening. It is an 18 gallon tank that empty. When I went to pour my pre-mixed gas/oil in the gas intake I get to about 2-3 gallons and it overflows out of the same intake I was pouring into, as well as the vent. I know the gas tank is empty because I can pick up one end of it. Ive tried adjusting the height of the trailer tongue to see if it was a gravity thing. I can actually hear the gas being poured into the tank, but then it starts overflowing at some point. I don't like being limited to 3 gallons of gas if I want to be out on the water for 8 hours. I have tried bouncing the back of the boat on the trailor and that seems to work to get the gas down into the tank, but it is just so much work. I don't have time to put in 1/8 of a gallon increments. It almost seems like a pressure think but I don't even know if this is possible. Any help would be greatly appreciated.

 

[sportsmanphil]

Re: gas overflow

You said you could lift the tank so I assume there is decent access. Have you removed the fill hose and checked for obstructions?

 

[FlyinGuy1017]

Re: gas overflow

Had the same problem once. Get a funnel and go slower. It'll stop the 'glug' effect in the tank.

 

[Bondo]

Re: gas overflow

Ayuh,... Sounds like the Vent is restricted...

 

[bassfishin5]

Re: gas overflow

I've checked the fill hose and no obstructions. How would you check for vent obstructions, remove the hose and check it? I guess I just dont understand how, even if there was an obstruction in either the vent hose or the fill hose it would overflow out of both. Even after some already makes it all the way into the tank.

 

[sportsmanphil]

Re: gas overflow

Check for a low spot in the vent hose.

Basically the vent hose attaches to the top of the tank. If the hose droops low somewhere between the top of the tank and the actual vent, it could have trapped fuel sitting in it. If the vent got fuel in it some time in the recent past (something that could have happened by over filling or on the water) then it could be trapped in that low spot (assuming that one is there) As you fill the tank the air pressure that should push out the vent cannot because there is fuel sitting in a low spot.

That is the only way I can think that gas could back flow in the fill and vent at the same time with minimal fuel in the tank.

 

[a70eliminator]

Re: gas overflow

Sounds like your vent tube somehow got pushed down into the bottom of the tank, thats the only way fuel can be coming back through it.