Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 exptools 1/6/84; site ihnss.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!ihnp4!ihnss!warren From: warren@ihnss.UUCP (Warren Montgomery) Newsgroups: net.auto Subject: Re: Re: Questions on Minor Quirks in a Mazda GLC Message-ID: <2246@ihnss.UUCP> Date: Tue, 2-Oct-84 12:02:41 EDT Article-I.D.: ihnss.2246 Posted: Tue Oct 2 12:02:41 1984 Date-Received: Wed, 3-Oct-84 20:00:47 EDT References: <2239@ihnss.UUCP> <374@cca.UUCP> Organization: AT&T Bell Labs, Naperville, IL Lines: 32 (Actually about gas vapors in fuel systems) I got several responses to my posting describing a mysterious noise from the rear of my new GLC, suggesting fuel pump noises, or noises of gas fumes escaping in some way. I discovered the source of my problem one day while refuelling. Sure enough, as I started to loosen the gas cap it made exactly the same noise that it had been making before. Apparently the noise is due to gas fumes escaping from the fuel cap if you don't get the cap all of the way on. (It's highly likely that this is the source, since the fuel cap on my car requires a bit of effort to turn to fully closed.) Several owners of other japanese cars pointed to similar noises and at least one suggested the same cause (on an Honda accord, as I recall). The gas pressure problem seems to be even more noticable on this car than on my 79 Rabbit, which occasionally builds up substantial positive or negative pressure in the fuel system making it hard to open the cap. (Once there was so much pressure that gas started to leak from one of the hose connections in the filler spout). Is unleaded gas more volatile than leaded? How much pressure is safe, and are there any safeguards against excessive pressure. I never worried about pressure bursting the gas tank in my old Toyota, since it didn't build up much, but there seems to be quite enough pressure in the fuel systems of newer cars to create a hazard as they age. -- Warren Montgomery ihnss!warren IH ((312)-979) x2494