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-   -   A Simple Gas Cap Story (https://www.goldwingfacts.com/forums/5-general-motorcycle-discussion-forum/586577-simple-gas-cap-story.html)

plain 10-09-2015 07:14 PM

A Simple Gas Cap Story
 
When I got home from work today, my '94' 1500 A/SE was making this buzzing bee noise. I was pretty sure the sound was somebody else's fault down the block so I had my Top Hand come out and look and she is the one who figured it out. I don't hear well enough to triangulate. It was at the filler pocket on the fairing. Specifically the gas cap. Anyway to rub salt in the wound when I whined about it to her she says, "Are you low on gas?" . Now I have to admit I kind of dig my heels in when it comes to her mechanical advice whether it is right or not but I had to admit to her this time that "Yeah I need gas. The tank is almost empty."
So before I relinquish my last vestige of male pride and admit she may have found the problem, I wanted to ask has anyone else had an issue with the cap buzzing when their tank is low? When I removed the cap the buzzing stopped so I am pretty sure something in there is not sealing like it did 10 or 20 years ago but can't find any info in my Clymer book nor anything specific about gas caps here. At least for about a hundred threads. Any ideas or remedies or will i be reduced to groveling to my wife for a solution?
Oh yeah the tank had maybe 3-6PSI? on it by my educated guesstimate, when I loosened the cap. Thanks Bros............

plain

Ken Bergen 10-09-2015 07:30 PM

Your fuel tank sits over your hot engine and has to vent as it heats up after parking, completely normal and nothing to worry about.

1potter1 10-09-2015 08:52 PM

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From my observations and information from GW mechanic it is not normal for the fuel tank to build up suction pressure.
Though I'm not sure if the earlier 1500s had the fuel tank vent tube on the fuel cap but the later 1500s are designed with vent system through a red vent tube coming off the top of the fuel cap.
What causes some bike to have the build up in pressure in the fuel tank is when the rubber diaphragm vent hole in the fuel cap gets off center and does not allow proper venting of your fuel tank through the red vent hose.
If you look up in fuel side of the gas cap you will see the orangish color rubber diaphragm with a hole in the center. To make sure you are getting the proper venting through the fuel cap and vent hose take a small screw driver and make sure that diaphragm hole is in the center of the gas cap or inline with the vent hose.

This pressure can also cause hard starting and I would venture to bet that this build up in pressure has led to some of the issue with the petcock valve going bad do to the over pressures on the fuel systems.

Aloha Tom 10-09-2015 10:40 PM

some like to soak the cap in Seafoam overnight, then blow it dry with a small can
of compressed air/computer dust-off stuff

Plus what the above post said about alignment

AZgl1800 10-09-2015 10:59 PM

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On both of my 1500s, I used a very small drill and put a hole in the cap just inside the sealing edge.
Problem solved.

rpeters549 10-10-2015 11:53 AM

Quote:

Originally Posted by AZgl1800 (Post 4256089)
On both of my 1500s, I used a very small drill and put a hole in the cap just inside the sealing edge.
Problem solved.

I am thinking I still want to remember to do this. Maybe tomorrow when Shabbat is over.

DaveO430 10-10-2015 06:18 PM

Quote:

Originally Posted by Ken Bergen (Post 4255785)
Your fuel tank sits over your hot engine and has to vent as it heats up after parking, completely normal and nothing to worry about.

Exactly, completely normal, there is nothing wrong with it so don't be trying to fix it.

plain 10-10-2015 06:26 PM

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OKAY! Thanks All! Now she'll never know I didn't know... :)

rpeters549 10-10-2015 08:17 PM

I have had that pressure cause an erratic idle for a few minutes after a real quick stop. I will firstly check that diaphragm alignment. For the past 10 years I have been 'fixing' the potential issue by loosening the cap a few degrees after installing. If it's lined up I will go for the mini-drill.

1potter1 10-11-2015 05:57 AM

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Look at the center of the gas cap in the picture, you'll see the orangish flat rubber diaphragm with a hole in the middle. What causes the tanks to hold the excessive pressure is when this small hole gets off center and doesn't allow the proper ventilation while riding.
I'll say it again, if you have a later model 1500 with Honda engineered vent system with red vent hose out the top of the fuel cap, you should not get the vacuuming effect after riding or when you open the gas cap.
Since purchasing my bike 3 years ago and putting on about 30K miles, keeping the vent hole aligned has eliminated the vacuuming (or boiling) effect on my bike.
If you find the vent hole is aligned in the gas cap then check for a pinched line in the red vent hose.

For me this fix eliminated the hard starting after warm.
This fix could possible prevent the failure of other components in the fuel system such as the fuel pump and petcock from the stress working outside their limits against the extra vacuum pressure?


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