{Chrysler 300} RE: 1964 gas tank pressure?
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{Chrysler 300} RE: 1964 gas tank pressure?



My 300D does the same thing, pretty sure it is normal

 

 

Larry

 

 

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Justin I
Sent: Wednesday, July 6, 2022 10:46 AM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: {Chrysler 300} 1964 gas tank pressure?

 

Hi Everyone,

 

It's my understanding that '64 Chryslers did not have vented tanks, and hence require a vented gas cap.  It is also my understanding that vented caps contain one-way check valves to prevent the tank collapsing under vacuum, but do not let vapors escape, so the cap will not relieve pressure buildup.  I've recently been working on a '64 (new fuel pump and new fuel lines) and I am surprised by the pressure that seems to build in the tank, especially on a warm day.  It's enough to blow the gas cap out of your hand if you are not prepared for it; don't have a firm grip.  Is this normal?

 

Thanks for any comments.

 

Justin

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