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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