Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 beta 3/9/83; site cca.UUCP
Path: utzoo!watmath!clyde!burl!hou3c!hocda!houxm!ihnp4!zehntel!hplabs!hao!seismo!harvard!wjh12!genrad!decvax!cca!heiser
From: heiser@cca.UUCP (Bill Heiser)
Newsgroups: net.auto
Subject: Re: Questions on Minor Quirks in a Mazda GLC
Message-ID: <374@cca.UUCP>
Date: Sun, 30-Sep-84 00:05:47 EDT
Article-I.D.: cca.374
Posted: Sun Sep 30 00:05:47 1984
Date-Received: Thu, 27-Sep-84 04:18:39 EDT
References: <2239@ihnss.UUCP>
Organization: Computer Corp America, Cambridge
Lines: 7

I don't have a Mazda, but I have a Honda Civic which also emits
the "tone" you described in your posting.  I traced it to the gas 
tank!  Apparently, pressure builds up in the tank and is not vented
properly.  The built-up pressure causes air to try to escape, causing
the humming tone...