[Chrysler300] Gas Tank Pressure!! - reply

["John J. Hertog" <crossram@xxxxxxxxxxxxx>]

Hi Mike, 

 

300F's use a NON-VENTED  gas cap, as the tank is internally vented thru a
vent tube.   Vented gas caps are for tanks that are not otherwise vented.
However, the 300F does have a vent tube and something must be wrong in the
venting department if there is any pressure, be it positive or negative
pressure, being built up inside the tank !

 

I suggest you look at your 1960 service manual, page 27 of the Fuel System,
fig.40. ;  it clearly shows the venting system. 

 

Mike, I have no idea why you should end up with positive pressure in your
tank.  That is just plain weird.  Maybe some other list member will have
some idea as to what THAT is all about. 

 

However, I do suggest that you check out your tank venting system. If you
get under the car, you will see (or should see), on the driver's side of the
gas tank, that there is a metal tube that runs the length of the tank, from
the rear by filler neck, to the front of the tank.  It terminates by the
left side strap that holds the gas tank in place, and then there's a short
piece of rubber hose that connects it to another short piece of metal tubing
that attaches to the underbody of the car, close to where the rear shock
absorber mounts to the body.  

 

You should be able to remove the gas cap, and then blow air through that
venting system backwards - perhaps something is plugged up or clogged. 

 

But I am mystified as to why you'd have positive pressure in the tank. 

 

John Hertog

Sag Harbor NY

 

 

 

  _____  

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Ron Waters
Sent: Sunday, July 23, 2006 12:45 PM
To: Michael Reed
Cc: Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Gas Tank Pressure!!

 

Is this why you would need a vented gas cap ?

Ron

----- Original Message ----- 
From: "Michael Reed" <mrreed@cablespeed. <mailto:mrreed%40cablespeed.com>
com>
Cc: <Chrysler300@ <mailto:Chrysler300%40yahoogroups.com> yahoogroups.com>
Sent: Sunday, July 23, 2006 6:25 AM
Subject: [Chrysler300] Gas Tank Pressure!!

> My "F" is experiencing something I find odd (and a bit disturbing), Hoping
to find an answer from my fellow 300 owners.
>
> I stopped at a gas station about 5 miles from home yesterday to purchase
some gasoline. When I twisted the gas tank cap to remove it, there was
enough pressure in the tank to almost blow the cap out of my hand. I put
about 6 gallons of gasoline in, and drove home. When I got home I removed
the cap again, and again there was already a significant amount of pressure
in the tank. This has happened at least one other time this year, and a few
times last year - but this doesn't occur every time I remove the cap
immediately after driving (short or long distance).
>
> I could understand if there was a vacuum in the tank -- but not pressure!
And after only 5 miles!
>
> Any ideas, anyone?
>
> Mike Reed in beautiful Lake Odessa, Michigan
>
>
>
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