Gas overflow

[rock69012001]

First, I hope this is a right place to ask this question. Can anyone tell me how I can fix this problem I have with my gas overflowing from the gas filler? It doesn't overflow out the overflow vents. I have to put gas in very very slow in over for the gas not to back splash out the gas filler, and filling my tanks up can get up to 15 to 20 minutes doing the stop and go thing of filling my tanks. Thanks for your help in this matter. Kevin

 

[Reel Poor]

Re: Gas overflow

Sounds to me like the vent is stopped up. Disconnect the vent hose from the fuel tank and blow it clear. It's also possible that the fill hose is kinked or restricted, not allowing the fuel to flow into the tank.

 

[JUSTINTIME]

Re: Gas overflow

has to be vent or a kinked hose

 

[tashasdaddy]

Re: Gas overflow

i have the same problem, i have to get the filler knozzle at just the right angle to fill without splash back, or cut off. the guy who designed my boat obviously had never fueled a boat. it's in the splash well under the where all the cables come thru the transom. you have to get he knozzle thru the wiring harness and controll cables. just plain stupid.

 

[JB]

Re: Gas overflow

Let's try this in the Boat Forum

 

[tommays]

Re: Gas overflow

My vent line was installed wrong right from the factory it had a full 360 deg loop in it :^

In general the vent and fill are in the rear of many tanks and and require the boat to be very level to work as the fuel will be at the rear of the tank blocking the vent if its NOT level


Tommays

 

[salty87]

Re: Gas overflow

provided you've checked your vent as indicated above and there are no problems, there are after-market devices to prevent gas from spilling out the filler.

iboats sell this...
http://www.iboats.com/mall/index.cg...=158974866&list_time=1161030542&view_id=37945

 

[QC]

Re: Gas overflow

When filling, even slowly, can you see fumes or hear the vents actually venting? If so, probably not a vent issue.

Like tashasdaddy, I have to have the filler nozzle just right or it will splash out and kick off. You should try upside down, sideways, in a little, out a little, basically anything to get the filler to go at a reasonable rate without kicking off. My guess is that you'll find a combo that works it this is not a vent problem.

BTW, welcome to iboats!

 

[Boatist]

Re: Gas overflow

Make sure the vent itself is open and not plugged. A very common problem is the way the vent hose is routed to the vent. The vent hose needs to slope from the vent to the tank with no sags. If it has a sag anywhere where fuel will stay in the line then the vent line is plugged with fuel. Any fuel in the vent line should run down into the tank.

The fill cap must be above the level of the tank and again the hose should not have any sags in it. The fill cap should be higher that the vent. If the fill hose does not have enough height above the tank or the slope of the hose is pretty flat to the tank then it will fill slow.

 

[Bondo]

Re: Gas overflow

My vent line was installed wrong right from the factory it had a full 360 deg loop in it
Tommays

Actually,........ That's the Right Way to do it...........

The Vent Line should go from the Hull vent fitting, looping Up,+ Then Down to the Tank..........

That Way,...... When Water Splashs into the Vent fitting, it runs Up the Loop,+ Back Out.........
I made the Mistake of going Directly Down to the Tank,+ had Serious Water in the Gas Issues.......
Putting the Loop back into the Vent Lines Cured it.......

The Trick of it is,........
Make sure the Loop is UP from both the Tank,+ the Vent............

 

[Boatist]

Re: Gas overflow

I totally disagree with a loop in the vent line. What will happen is the down side of the loop will get fuel in it when you over fill the tank or when the tank is full in rough seas. Now you have fuel in the loop and when you fill the tank the air that should go out the vent line is blocked by the fuel and will have to go out the fill line forcing fuel back up the fill line with the air excaping.

With the fuel cap on and a temperature rise like a summer day the pressure in the tank will also force the fuel in the down side of the loop up the vent and out into the water or on the ground.

If the fill hose seals over the fill opening then the air is forced out the vent line as it should be but the fuel in the bottom of the loop will also be forced out the on to the ground if on the trailer or worse yet if in the water into the water. This means a unsafe contition for you boat and other boats in area. It means polution and dead fish. If caught it means big fines for polution and paying for the clean up. You are not alowed to spill one drop of gas in the water.

If you fuel vent is installed correctly with a screen no water will get in unless you kid or ememy puts a hose over it and turns it on.

 

[rock69012001]

Re: Gas overflow

With the fuel cap on and a temperature rise like a summer day the pressure in the tank will also force the fuel in the down side of the loop up the vent and out into the water or on the ground.

The above quote is what happens to my boat inthe summer months. So, when I fill up, it takes a long while, then the spillout, gas all over, then clean up. So, after trying some of these ideas, I still have the same problem.

Any other ideas? Thanks, Kevin

 

[JUSTINTIME]

Re: Gas overflow

did u check ur vent lines and anti syphon valves?

 

[Bondo]

Re: Gas overflow

While this Isn't the greatest Picture,.....

If the Vent Line is run as I've shown,......

It'll keep the Water from entering the Tank from Splashing on it,....
(And Believe Me,... It WILL take on Water in normal boating activities, That little Screen Doesn't Stop Anything)
And,.... Due to the Top of the Loop being at the Top,....
There's NO water, or Gas laying In the Vent Line.......

You may not Agree,....... But This Is a Fact........

 

[bruceb58]

Re: Gas overflow

As Bondo said, the loop needs to be above the level of the vent itself. Unfortunately, many smaller boats don't have the room above the vent to allow this and that is why they don't loop the vent hose.