Pressurized fuel tank


Information and questions on GL1100 Goldwings (1980-1983)
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imadamine
Posts: 37
Joined: Sun Aug 09, 2015 6:14 am
Location: lebanon
Motorcycle: 1981 GL1100I Interstate

Pressurized fuel tank

Post by imadamine »



Guys i've noticed on my GL1100 81 the fuel tank is getting lots of pressure when the weather is hot! Whether the bike is stationary or on the go, when I open the fuel cap it blows away and can feel fuel fumes getting out! What could be the problem?


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RBGERSON
Posts: 3233
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Pressurized fuel tank

Post by RBGERSON »

clogged gas cap vent ..clean the vent...soak in vinegar over night then blow off..or drill a small hole through the cap. new cap?
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB
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imadamine
Posts: 37
Joined: Sun Aug 09, 2015 6:14 am
Location: lebanon
Motorcycle: 1981 GL1100I Interstate

Re: Pressurized fuel tank

Post by imadamine »

No its the old cap! Do you mean to soak the cap in vinegar?
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Johnyy Smoke
Posts: 722
Joined: Sat Nov 26, 2011 6:44 am
Location: Se Minnesota
Motorcycle: 1980 GL1100
Vetter. "Its like Deja Vu all over again".

Re: Pressurized fuel tank

Post by Johnyy Smoke »

Yep, soak the cap overnight in white vinegar. Then use plenty of air to clean it out.
Clogged vents can lead to fuel pump failure over time. Also can cause leaking carbs. Regards, Johnny
indianakid
Posts: 255
Joined: Sun Sep 26, 2010 5:28 pm
Location: United States
Motorcycle: 83 GL1100 I

Re: Pressurized fuel tank

Post by indianakid »

hi imadamine,

the gas cap is designed to maintain pressure in the tank from 2inhg vacuum to 2 psi pressure. so the pressure relief you hear when opening the cap is normal. 2psi is normal pump pressure so it wont be pressurizing the carbs any more than the pump. and the negative pressure relief valve will allow air to enter the tank when the vacuum is greater than 2inhg (very little) i made a post a while back to help wing owners understand how the cap works so they wont go drilling holes in them.

here it is.................

viewtopic.php?f=19&t=30077&p=173534&hil ... ap#p173534

good luck.


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