Subject: Re: Gas Cap Woes
Author: Bill Cohoon
Date: Jan 5, 2005, 12:47 PM
Post ID: 1718158223
don't get the physics myself... I've had the same problem on several
bikes... but always assumed I was creating a vacuum, not pressurizing...
Bill
Greg Bender wrote:
| My tank has the screw on type gas cap. The original cap - even with a new gasket - allowed fuel to escape through the top vent holes. The fuel then ran down the tank...not to my liking. I purchased a generic vented gas cap from Dennis Kirk 4XVJGZBLKEEGJLA0WTISM4VMDK0NCIV0?catId=211&leafCatId=21105&skuId=h18199) and it seals perfectly. I never get any gas leakage from the cap. It allows air in, but it does not allow excess pressure to escape. Normally I wouldn't think this would be a problem, as I would expect a decrease in the fuel level to create a vacuum inside the tank...easily solved by letting fuel into the tank. However, I have found that excess pressure is built up inside the tank...and is especially noticeable when the tank is 1/3 full or less and/or when their is a great temperature difference between the fuel and the ambient temperature. When I release the gas cap, I can hear (and feel) air escaping out. Although I don't understand the physics of it, this actually starves the engine of fuel from time to time on my rides...the engine will come close to dieing and I have to loosen the cap to allow the excess pressure to escape. I think John Ulrich and/or Mark Etheridge may have suggested drilling a strategically placed hole in the inner workings of the cap, but I'm not sure where that location might be. Does anyone have any thoughts or suggestions for improvement? Regards, Greg Bender 1971 Ambassador 2000 Quota http://www.thisoldtractor.com/gtbender Your free subscription is supported by today's sponsor: ------------------------------------------------------------------- Get a Holy Bible for FREE! http://click.topica.com/caacYkCb1dfltb2ryAGf/PermissionData ------------------------------------------------------------------- |