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#568086 - 06/09/17 10:08 PM Tank Venting Question  
Joined: Jan 2003
Posts: 531
hawkshaw Offline
hawkshaw  Offline

Joined: Jan 2003
Posts: 531
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
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1986 Fisher Hawk 3V with Mercury 35 Fishing Boat
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#568116 - 06/12/17 12:35 PM Re: Tank Venting Question [Re: hawkshaw]  
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Posts: 1,834
Lowrider78 Offline
Lowrider78  Offline

Joined: Jan 2004
Posts: 1,834
Newton Ks
Loosen the tank cap and see if the problem stops.

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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 02:10 PM Re: Tank Venting Question [Re: hawkshaw]  
Joined: Oct 2003
Posts: 7,182
captkevin Offline
captkevin  Offline

Joined: Oct 2003
Posts: 7,182
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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