From what you have just advised, I can identify your Fuel Pump as being an
S.U model LCS as identified by the 4644/1 SU part number that is cast onto
the main body of an LCS model pump. The 4644/1 is the part number of just
the aluminium body and not the total fuel-pump ( I don’t know significance
of the “L” underneath the 4644/1 but its always there)
The K6 is the date-code for when the fuel pump assembly was completed by SU,
thus before delivery to Jaguar to use. In this case K = 1953 and 6 = June,
so your LCS fuel pump was made in June 1953.
In June 1953 SU was only making LCS model fuel pumps to their specification
AUA31 (under their new terminology or specification PP31 under the older S.U
terminology - PP = Petrol Pump).
Your car S674106 has a build-date of early July 1953 (don’t know day, but
10th LHD OTS built in July), so that is totally consistent with your June
1953 dated fuel-pump being your XKs factory original.
What I cannot confirm is whether your fuel-pump remains it its original
condition or not, as these pumps are fully rebuildable with use of either
original parts or later upgraded/revised parts.
An LCS model fuel pump to AUA31 specification was originally fitted with
SINGLE-CONTACT-POINTS however these were discontinued in about 1955 and
updated with 100% interchangeable DOUBLE-CONTACT-POINTS, thus the otherwise
exactly the same LCS fuel-pump assembly was now considered to be to AUA57
specification (this format now well established, so never to the older PP
If your fuel pump has had new points fitted at some time in its life (common
maintenance job) then it will probably now have DOUBLE-CONTACT-POINTS
fitted, but you never know - you do still see AUA31 specification fuel-pumps
still with their original Single-Contact-Points. (Personally, as points
are hidden under the Black Cap and cannot be seen and in operation SOUND the
same, I would prefer having better functioning Double Contact points fitted,
a product improvement made by SU in 1955.)
Otherwise the AUA31 or AUA57 SU model LCS fuel-pump continued unchanged for
the rest of XK120, XK140 and first few 1957 XK150s, with the only
identifiable variable being the YM date-code stamped on the short-side of
one cast-aluminium end-LID.
But as noted previously, the original ‘long’ COIL BODY can be replaced with
a post 1960 ‘short’ COIL BODY, the two cast-aluminium LIDS can be replaced
with the post 1962 pressed-steel LIDS, and the FLAT-BLACK CAP can be
replaced with the STEPPED-BLACK CAP from a post 1957 AUA52 specification
fuel pump as fitted to XK150 1957-60. There were 6-volt versions of these
LCS fuel-pumps identifiable externally by having a BROWN CAP instead of
Sorry to be long-winded to your simple question, but there is some general
interest in this subject.
Roger Payne - XK140MC OTS; E-Type 4.2 S.1 OTS; DSV8.
From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of
Sent: Thursday, 10 July 2014 7:09 AM
Subject: Re: [xk] Fuel Pumps
In reply to a message from Roger Payne sent Tue 8 Jul 2014:
What is the YM code explanation for K 6 stamped on the
short side of the top aluminium lid on one of these pumps.
Pump is a 4644/1 L
The original message included these comments:
Rob - and others interested in this thread.
When fitted with the cast-aluminium lids, one lid only received a YM
date-code stamp on a short-side. When the pressed steel lids were fitted
Cohasset, MA, United States
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