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#568086 - 06/09/17 09:08 PM Tank Venting Question
hawkshaw Offline

Registered: 01/15/03
Posts: 531
Loc: Tennessee
My brother in law has a brand new Godfrey Poontoon boat. It has an outboard engine (Yamaha 90). The issue is it's pulling a vacuum on the fuel lines and the pump bulb is collapsing. It has the new EPA gas vapor system on it that has two check valves that only let pressure flow out but not in. When the boat uses fuel how is the loss of volume and subsequent negative pressure (vacuum) supposed to be compensated. The fuel cap appear to seal it off tight.


'99 Larson 206 SEI
The Hawk's Nest
1986 Fisher Hawk 3V with Mercury 35 Fishing Boat

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#568116 - 06/12/17 11:35 AM Re: Tank Venting Question [Re: hawkshaw]
Lowrider78 Offline

Registered: 01/31/04
Posts: 1832
Loc: Newton Ks
Loosen the tank cap and see if the problem stops.
That streak that howled by? That was me. Did ya like the roostertail? Big Blocks and Jets Forever
1978 Hawiian 20' Bowrider, 454, Dominator pump
1990 Magnum Mach 1 24' Cuddy Cabin Cruiser, 454, Bravo 1 drive.
1993 Suburban 454 tows the Mach 1 to water.
2001 Blazer 4x4 4.3L gets the Hawaiian wet.

#568118 - 06/12/17 01:10 PM Re: Tank Venting Question [Re: hawkshaw]
captkevin Offline

Registered: 10/02/03
Posts: 6988
Loc: Chicago, IL
If he bought it brand new I'd be letting the dealer make any repairs as to not compromise the warranty.
2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4


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