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post #11 of 14 Old 06-23-2008
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Here's another crazy idea...if the vent hose has a belly in it that could hold some fuel, the pressure of filling the tank could cause the simultaneous symptoms you are experiencing. But this would only be for a brief moment until the 'belly' flushes its contents. You still need to do something to address this if it's true, because you'll spew deisel every time you fill up until the belly clears itself out.

This would be a recurring problem if the dip in the vent hose was low enough to 'refill' itself when you tack or get in a seaway.

Hope this helps.
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post #12 of 14 Old 06-24-2008 Thread Starter
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Thanks.

The vent hose appears to be tapped off the fill hose and when the fuel backs up because of the "dip" in the fill hose it vents the deisel.

I just have to fill very slowly or get the dip out of the fill hose
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post #13 of 14 Old 06-24-2008
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I would highly recommend moving the vent hose to the tank if you can. Where it is now is a PITA and not a great solution IMHO.

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post #14 of 14 Old 06-24-2008
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Nunzio,
Once you get this problem 'fixed' and know your tank is full, take dowel rod and stick it down into the filler vent until it hits bottom - it makes a pretty good accurate guage of when the tank is full. Keep track of engine hours and such and you can put additional marks on it to let you know how much fuel you really have.
I'm not mathmatically inclined, but other owners have Gemini's have calculated that one inch of fuel in either of our tanks (18 gallons each, 11.25 inches sq on the base) comes out to .625 gallons per inch on the dip stick - that's a whole lot more accurate than a needle waving from 1/4 to 1/2 tank.
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