Fueling problem

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Jim A

Every time I fill up fuel spills out the overflow air vent. I have been putting a dipper under it to catch the spill but it seems to be getting worst. I don't understand why, I am filling is slow. As soon as I see fuel come out the vent I stop. The last time I filled up the tank seem to just pump it back out after I was done. Does anyone have any ideas what wrong? Thanks, Jim
 
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John renfro

splash

hello Jim, it may be that your filler neck is mounted below the max capacity level of the tank. As you fill the tank you are developing a gas bubble in this expansion chamber and the fumes are pushing the fuel back out the filler. What boat do you have? What type tank? do you have two tanks hooked together with a fuel selector valve between them?One tank may not have a vent and is pressurizing the tank you are filling. john
 
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warren feldstein

me too,

This problem occurs if I fill closer than about 2" from the top of the tank.
 
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Victor Robert

Racor fuel trap

I had a problem with sputter from the breather while I was filling. This meant hanging over the side with a paper towel or creating a most unseemly sheen on the water (frowned upon in the pristine waters of the Keys). The solution was to add a Racor overflow prevention device to the breather tube, just before the through-hull. It is a simple blue translucent plastic ball (about 4") with a fuel line barb at the bottom (in) and another at the top (out). Inside is space for the fuel to go (instead of overboard) and a float valve to prevent overflow if the bowl should fill completely. After filling, any fuel in the bowl drains back down to the tank. Installing it is as simple as deciding where in the line it will go, cutting out about 5 inches of line, pressing the existing line onto the top and bottom barbs, and adding hose clamps. This solves the problem of sputter from the breather, but it may enhance the problem of backwash out the filler tube, since it may block the breather tube entirely. I always keep an eye on the fuel gauge, and know that when the needle just passes the Full dot I'm done. I don't wait for feedback at the filler tube.
 
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Jim Anzalone

Good advice, thanks

Look like I am not alone with this problem! Thanks for the great advice! Jim
 
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Don Alexander

My H 376

has the vent 6" BELOW the filler pipe so it is guaranteed to overflow every time I fill up. Needs an inverted "U" bend but there is no room. Thanks for the info on the Racor gadget.
 
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