Re: [Chrysler300] 300C vapour lock?

["John L. Chesnutt" <chesnutt@xxxx>]

A vapor lock does not appear to be the problem with your 300C. Your engine
stalls at idle.
It sounds like you are flooding out at idle which could be due to the needle
and seat not shutting off the fuel.
.
Laurence G. Johnson is on the right track. Check the fuel level in the
carbs.

Your original needle and seat were all brass. Carter Carburetor redesigned
the needle so it would not leak. They put out a General Service Bulletin No.
531, March, 1960 - Subject: NEW RUBBER TIPPED FUEL INLET NEEDLE AND SEAT
Part 25-392 Used on Carburetors for Chrysler Corp. The Conventional (Bass
on Brass) - had leakage past the needle caused by Dirt Particles, The New
Rubber Tip Needle fixes that problem "because of its resilient sealing
surface the needle tip will make a tight seal even with fuel contamination
by iron oxide and other dirt particles. "

In 1960, the suggested list price for Part 25-392S was $3.29.

I purchased my 300C in July 1958 and had the very same problem you
experience. I replaced the needle and seats in both carbs. That fixed the
problem.

John & Arlys Chesnutt, Portland, OR.
----- Original Message -----
From: "Oddvin Skråmestø" <ragtopman@xxxx>
To: <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Friday, September 13, 2002 2:25 PM
Subject: [Chrysler300] 300C vapour lock?


> Hi.
> This summer we have had the hotest summer ever here in Norway, several
days with temperatures over 82F. Driving my 300C in this temperature, the
engine stalls when idling, like stopping at traffic lights etc. After a
minor stop or driving at a slow section on the road, the car hesitates when
accelerating. It seems like a fuelpump failure, but only when hot. At
startup cold, and at continuous high speed driving the car acts normal. When
the car stops, it give me a hard time trying to make it run. I have never
had this kind of trouble before, and I have also driven the car at high
temperatures before too. Can a fuelpump start to fail when hot? Or is the
heat making a vapour lock at the pump. The pump is 12 years old, could this
be the first sign of wear?.
> I'm planning to install an electric fuelpump to assist the original, and
to help filling up the carbs after the winter rest.
> What brand and type should I buy? Anyone with experience on this?
>
> Thanks.
>
> Oddvin Skråmestø
> Norway.
>
>
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