I recently purchased a 64-66 fuel pump for a SHP (365 or 375HP), model #40083 only to notice it also has a "KL" after the numbers located on the flange. Looks like "40083KL". What's the "KL" mean? Thanks in advance.
-
-
Re: '64-'66 Fuel Pump Model #40083KL
Good question! I'll be curious to hear the answers on your question. I always thought that was a re-builders ID but that was just a guess on my part. -
Re: '64-'66 Fuel Pump Model #40083KL
The 40083 pump was no longer used in production after 1965. The use of the supplementary date codes did not start until some time in 1965, so the presence of the 2 alpha characters on a 40083 pump means that it may be a service replacement.
The decryption of the alpha codes on AC fuel pumps is not perfected, at least for the early years. For years subsequent to about 1970, some of the theorys seem to make sense, for an informative discussion of the subject, follow this:
https://www.forums.ncrs.org/showthre...david&uid=4934
A more accurate way to determine the age of your fuel pump is to open it and examine the casting clock which appears in one of the valve chambers of the main body.
Following is a photo of a 40083 pump body cast in June 1971:
Last edited by Joe C.; December 21, 2010, 06:14 PM.Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
You may be right. I took a pic of the inside, if you are correct I have a May '71 fuel pump. Still can't relate to the "KL". Thanks for the insight.Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
It would be good to see a picture of the entire pump from the top. The size of the numbers in the stamping as well as the color of the material in the top do not look like the originals, but maybe it is just the light. Des it have the two wings between the vertical part of the housing and the angled part as original?Bill Clupper #618Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
Thanks for writing. I have it apart at the moment trying, unsuccessfully so far, to detach the pump diaphram rod from the pump arm. Attached pics should help in validating the originality. Tried to get plenty of light in pics, believe the color may be misleading due to it being painted black before I got it. More cleaning in the forecast. Any help identifying what year vette this is correct for would be greatly appreicated. ALSO, any insight as to the correct position of the diaphram and pump arm that leads to detaching them would also be greatly appreciated.Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
Have two of these, one original 64 other is a 67 replacement. Neither has the casting clock however they both have a date (of a sort) on the inside. See the "64" at top left and just before number in center. The 67 has same thing.
Now your font, 40083, is not what is on either of mine, they are both size consistent.Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
It has all the correct features of the production 40083. I suspect the letters are a service code. The oem pumps were not used after 1966 as far as I know, in '67 GM switched all Chevrolet (for sure) and I think the entire proct line over to the crimped style pumps. AC offered new and rebuilt units for some years, I suspect what you have is a "new" (late 1960's- early 1970's) My 4/69 AC Fuel pump catalog indicates that "new" pumps were still available as of 3/69, and I expect for a few years beyond. I agree with Alan, all the known originals I have seen have consistent sizing in the letters of the part number stamping.Bill Clupper #618Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
How do you be believe a judge view this pump on my '64 with a Nov 19, '63 production date?Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
One speculation (again, that's a guesstimate) of the suffix alpha characters is they they reflect a where built ID...Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
If they are paying attention, they should notice the font size differences as well as the suffix and score it as a service replacement. Correct part number, with non0typical suffix, produced with minor variances from the original for service replacement use.Bill Clupper #618Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
A dead giveaway with these pumps is the copper coated steel pivot pin used on originals and early service replacements. These pins are not used by rebuilders, and are not available in the aftermarket. If your pump has been rebuilt at some time in the past, then chances are that this pin has already been replaced. If not, a careful rebuilder will be able to save it and re-use it. The pins also feature a unique "X" mark on one end and a unique deformation at the other.
See my article in the Summer 2010 Restorer for more information.
To the OP: see my Restorer article where I address your situation. However, the answer you find there may not be to your complete satisfaction.
Many judges look only for the "AC" logo and the stamped part number on the mount flange. More experienced judges SHOULD be looking for the "crow's foot" reinforcements, and the double stepped pin boss, which are not found on reproductions. Original pumps had magnesium, not pot metal diaphragm housings and pump bodies. There is one additional nuance which has come to my attention after I wrote that Restorer article, which may be sufficient to separate the production originals from the very early service replacements. It has to do with the config of the "made in USA" script on the pump body. There are NO judges, to my knowledge, who know enough to look for this, nor would they make any deduct if they saw it.Last edited by Joe C.; December 25, 2010, 09:09 AM.Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
[quote=Joe Ciaravino (32899);527988]
" It has to do with the config of the "made in USA" script on the pump body. There are NO judges, to my knowledge, who know enough to look for this, nor would they make any deduct if they saw it."
What Jim is NOT pointing out can be partially seen in the second of Alan Drake's photos - the casting is different. In Alan's photo at about 2:00 o'clock, there is a bulge/projection/reinforcement right where the "IN" would be in "MADE IN USA". There is another one 180 degrees away on the other side. If NCRS' only negative rated (-1.1) Judge knows about it, I'm sure there are others.Comment
-
Re: '64-'66 Fuel Pump Model #40083KL
The "KL" is an assembly date code at the AC plant representing November 1972. The suffix alpha characters are common on production line 4657 fuel pumps on 1965 and 1966 models ("LE"= December 1965, "AF" = Jan. 1966). The 1963-1964 and probably some early 1965 4657 pump were stamped just with the 4 numbers "4657". See research in the link below.
https://www.forums.ncrs.org/showthre...0083+fuel+pumpComment
Comment