>>> "'Ron Waters' ronbo97@xxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx> 10/19/2014 8:56 PM >>>
Wayne Graefen's 300C Restoration Handbook lists two correct fuel pumps for
the 300C: Carter M2503S and M2610S. The latter has a 'notched flange for
block face clearance'. The 300C uses the same fuel pump as a single 4bbl
392.
Ron
----- Original Message -----
From: "Ray Melton rfmelton@xxxxxxx [Chrysler300]"
<Chrysler300-noreply@xxxxxxxxxxxxxxx>
To: "chrysler300" <chrysler300@xxxxxxxxxxxxxxx>
Sent: Sunday, October 19, 2014 8:32 PM
Subject: [Chrysler300] Anything "special" about fuel pump for 1957 Chrysler
300C?
> Hello All --
>
> I have heard some talk but have never seen a clear declaration (and
> documentation) about the fuel pump for the 300C being somehow "upgraded"
> from the "regular" pump used on the single-carb models. Although it does
> make some sense that pump for the 300C/D would have to satisfy the
> higher flow demands of the dual-carb 392's, is there any clear
> documentation of this, or is it just an urban legend? If there are any
> differences, what are they? Different lever pivot point for longer
> stroke for greater volume/cycle = greater flowrate? Enlarged internal
> passages? Higher relief pressure? I have heard of a "notch" in the
> mating circle of the upper/lower parts of the "special" pump and indeed
> have in my possession two pumps with such a notch ground into them.
> However, the notches are clearly done by someone's grinder long after
> original manufacture; they do NOT look at all like they were part of the
> original casting. Both pumps carry a rebuilder's metal tag, and I
> strongly suspect that the notches were cut that way merely to allow the
> rebuilder to reassemble the halves in the original orientation -- the
> edges of the notches are shinier and sharper than anywhere else on the
> rest of the casting.
>
> Can anyone provide a definitive and documented differentiation,
> including the standard vs. uprated specs?
>
> If there is indeed a difference, where can one obtain the uprated pump?
> I never see such a thing offered anywhere.
>
> Related question: If it turns out that I have a lowly standard pump on
> my 300C, is there a way to get it upgraded to "300 specs"? Where can I
> get the parts to rebuild it, or where can I send my puny pump to get it
> rebuilt to upgraded specs?
>
> Another related question: Even if there is no such thing as an
> "uprated" pump, can anyone suggest where I could get my standard pump
> rebuilt, and at what cost? Or am I better off just trying to find a
> NOS or recently rebuilt one?
>
> And a final question that I perhaps should have asked near the beginning
> -- even if there IS a special uprated pump available for the 392 hemis,
> do I really NEED one for my non-racing application? I'm guessing that if
> I ever even attempted somewhat prolonged full-throttle application (like
> maybe tempting fate - and the Cokers, not to mention the troopers!)
> during a brief run to maybe 110 - 120 mph, if the fuel flowrate is
> insufficient, all it's going to do is lie down on the top end, right?
>
> Ray Melton
> Las Cruces, NM
>
>
> ------------------------------------
> Posted by: Ray Melton <rfmelton@xxxxxxx>
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