pressurised fuel tank?


Technical information and Q&A applicable to all years and models of Goldwings
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Bynki
Posts: 10
Joined: Fri Nov 08, 2013 12:22 pm
Location: United Kingdom
Motorcycle: 1982 GL1100i

pressurised fuel tank?

Postby Bynki » Sun Mar 02, 2014 5:11 am



Hi guys, Anyone know if the fuel tank on a 1982 GL1100i should be pressurised? When ever I open the the filler it blows out at me. perhaps theres a air bleed hole somewhere thats blocked?

many thanks



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Sagebrush
Posts: 96
Joined: Tue Mar 09, 2010 5:47 pm
Location: Raleigh, NC
Motorcycle: 1981 GL1100
1982 GL1100
2001 GL1800 CSC Trike
2002 GL1800

Re: pressurised fuel tank?

Postby Sagebrush » Sun Mar 02, 2014 8:15 am

There is a vent in the gas cap. It allows air in to prevent a vacuum as gas is used up but will not allow air out. It acts like a check valve. If you are not experiencing the engine running poorly because of a vacuum buildup in the tank causing restricted gas flow then all is well.

Bynki
Posts: 10
Joined: Fri Nov 08, 2013 12:22 pm
Location: United Kingdom
Motorcycle: 1982 GL1100i

Re: pressurised fuel tank?

Postby Bynki » Sun Mar 02, 2014 8:38 am

many thanks Sagebrush. I've found that the engine floods when the cap is fitted so I'm putting it in an ultrasonic cleaner just in case the breather is blocked. (I also found a couple of tips on this forum relating to the same problem).
I'll keep you informed when I've found the cause/problem/ or sorted.

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ct1500
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Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: pressurised fuel tank?

Postby ct1500 » Sun Mar 02, 2014 11:00 am

What is the normal fuel pump pressure of an 1100, maybe 2 psi? The float valves if working correctly would certainly hold this pressure and most likely a good deal more.

The theory of pressure build up in tank blowing past float valves can be checked easy enough with a fuel pressure gauge attached in line. I will guess that it would take 5-10 psi to do this and if that much pressure were in the tank would blow the fuel cap off like a rocket when removed.
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Bynki
Posts: 10
Joined: Fri Nov 08, 2013 12:22 pm
Location: United Kingdom
Motorcycle: 1982 GL1100i

Re: pressurised fuel tank?

Postby Bynki » Tue Mar 04, 2014 5:48 am

Thanks CT1500, heres the update: I removed the carbs and checked the float needles, and yes one of them was not seating properly. So a good clean with some metal polish has put that right. I also ultrasonically cleaned the tank filler cap to ensure the small vents where clear, this also has rectified the pressure in the tank. It still builds up slightly, but nowhere near what it was doing. While I was in the carbs, I set the float hight and all seems fine with that too. The one thing that I did find was that the accelerator pump diaphragm had a tiny tear in it so I'm waiting on a replacement now. Hopefully all will be good once it's put back together. Thanks for all the people that took the time to answer me, I certainly helped.

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ct1500
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Re: pressurised fuel tank?

Postby ct1500 » Tue Mar 04, 2014 11:41 am

If your mixture screws have flags or stops on them limiting adjustment (new vehicle emission required when built) now is the time to disable them to allow full adjustment travel for future settings/adjustment.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

Bynki
Posts: 10
Joined: Fri Nov 08, 2013 12:22 pm
Location: United Kingdom
Motorcycle: 1982 GL1100i

Re: pressurised fuel tank?

Postby Bynki » Tue Mar 04, 2014 12:54 pm

Good idea, I'll do that, thanks. (Also in my last post, please read the last part as "it certainly helped". :D




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