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fuel tank vent

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Topic author
tx210coastal
Posts: 1
Joined: Wed Aug 18, 2021 12:28 pm
Vessel Info: 1998 Wellcraft 210 Coastal. 4.3 mercruiser

fuel tank vent

Postby tx210coastal » Wed Aug 18, 2021 1:38 pm

I have a 1998 210 Coastal. I have been having issues with phase separation of the ethanol fuel. I'm attempting to locate the vent for the fuel tank. On the port bow, there is a thru hull vent that I assumed was for the fuel tank. But, when I trace the vent hose from the tank it runs up under the fuel cap. Is this the only vent for the tank? What would the thru hull vent fitting be for? I bought an inline dryer cartridge to install on the vent hose to try and eliminate atmospheric moisture from being drawn into the tank. But, if the only vent is under the gas cap, would it not be sealed from the environment?
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CptBill
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Vessel Info: Jester Toy
2002 270 Coastal, Twin Yamaha 4 stroke 250
330Larson Cabrio twin 5.7l EFI V.P duo props
2760 Regal commodore
40' pacemaker flush deck
2855 Bayliner, 25' Marathon aft cabin
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Re: fuel tank vent

Postby CptBill » Fri Aug 20, 2021 2:24 pm

Most of them vent either right at the top of fuel fill(if you take the cap off there will be a hole for the vent hose) Right near the fuel fill cap and some under the gunnel by the fuel fill cap. Try tracing the vent line from the tank if you can get to it
Never Ever Ever do anything that test your wife's memory :captain:
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The LA Professor
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Joined: Tue Jun 29, 2021 10:17 pm
Vessel Info: 1997 Wellcraft 23 Walk Around
1997 Evinrude 200
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Re: fuel tank vent

Postby The LA Professor » Mon Aug 23, 2021 10:45 am

I have a 1997 23' Excel. I think they are a very similar design.

Look in the area where the oil tank is. There is a hose running up to a through-hull on the side. That hose is the vent.

Mine was clogged with debris. Disconnected from both ends (tank and fitting), and used a shop-vac to get everything out.
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