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Re: AC fuel pump date code research data
Dave,
You had a couple of mine from before...
40248 no codes
40366 9H if I recall, a service part
No other new news but it is the weekend and autorama is in town, go hot rods!Comment
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Re: AC fuel pump date code research data
Dave,
at one time (1978) it was on my 66 along with another that had a short life due to lousy alcohol in the gasoline but I have no idea if it was original, I doubt it, given 3 pumps in 30 years, most likely the original was changed in the first 10 years.
On the other question of the date before or after, it is BEFORE, so that brings up good point doesn't it???Comment
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Re: AC fuel pump date code research data
Ron,
I assume you are referring to your "9H40366" fuel pump.
The "9H" does not fit very well with the 2-digit letter date codes on other pumps made in 1968. The number/letter stamped date code did not really appear until 1971.
GM # 6416245 (AC # 40366) was discontinued sometime between June 1979 and Dec. 1981 so the pump was not made in the mid 1990's when the year code "H" was probably repeated.
I have no explanation other than a stamping error.
DaveComment
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Re: AC fuel pump date code research data
Considerable variation in AC fuel pump component dates and vehicle assembly dates can be expected based on AC business and production practices at the time. Essentially, box procurement, body casting, body machining and fuel pump assembly were batch processes rather than an integrated process as follows:- Boxes were supplied by local suppliers who carried the inventory at the supplier location and were "released" for shipment by AC as needed. As a result, the supplier could carry inventory to reduce their changeover cost at their disgression.
- Fuel Pump bodies were batch produced by setting dies in casting machines. Only high volume castings might run in dedicated equipment. The lower the volume the greater the batch size in terms of days supply to minimize changeover cost. High die maintenance, inherent with the die casting process, also impacts batch size. Also, first in first out inventory control was not always practiced.
- Fuel pump body machining was also , except for high volume part numbers, subject to a batch process influenced by volume.
- Since replacement and OEM products were produced on shared equipment there typically would be a minimum of one weeks requirements in the AC OEM warehouse on low and medium volume part numbers at any point in time.
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Re: AC fuel pump date code research data
Dave,
Using your theory, I was expecting H - 1968?
With a sample size of one, we do not know for sure when the alpha numeric system first started.
It always helps to see a print - that will show what was to have been stamped and how and will show when the method of stamping changed.
Working on it - we need more data...Comment
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Re: AC fuel pump date code research data
On the "63 fuel pump" thread there are photos of a NOS "4657" fuel pump with a "64" casting along with one hash mark (Jan. 1964) in a box dated "AUG.-63".Comment
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Re: AC fuel pump date code research data
Ron,
It may take years before we figure out what the "9H" on your "9H40366" fuel pump (65-66 Corvette big block) signifies unless some other members step up to the plate. It might be a stamping mistake, the 9th day of 1968, or something else but it's probably a service pump------maybe or maybe not.
Do you have any or know of any original 40466 pumps?
DaveComment
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Re: AC fuel pump date code research data
Dave,
I do not expect it will take that long if we get help from the source.
A service part is most probable given the service unique aspect of the part showed in the GM parts books in the late 60's. To test the theory its always good to see most fo the data falling upon normal week days>>>
Jan 9, 1968 is a Tuesday.
I do not have another 40366 and if you recall we had about the same response to this as we did the PCV valves for the early BB's, but given half of those TF and BG big blocks left St Louis 100 Cu. In. smaller...
you can't expect to get a good response, at least not wrap the basis of a theory around anyways.Comment
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Re: AC fuel pump date code research data
Ron,
I finally had a chance to do some research on your "40248" pump.
According to my 1970 Hollander both 40248 and 40366
pumps are classified as Hollander part # 301 in the "IDENTIFICATION - FUEL PUMP" section. Hollander #301 shows the following:
"Chev 6416245 AC40366"
"Corvette '65 - 8-396"
"Corvette '66 8-427"
My 1966 Hollander does NOT list a fuel pump for the 1965 Corvette 396 or 1966 Corvette 427.
My 1965 Chevrolet Parts Catalog (effective May 1965) lists GM # 6415962 as the fuel pump for the 65 Corvette (396). According to Chevrolet Parts History GM # 6415962 was replaced with GM # 6416245 in August 1967.
My 1966 Chevrolet Parts Catalog (effective Oct. 1965) lists GM # 6415962 as the 65 Corvette (396) pump and GM # 6416245 as the 66 Corvette (427) (exc. Sp/H/Per.) pump.
After all this I wish that I would have simply looked in my 1965 Corvette assembly manual, UPC L78, sheet C1. The fuel pump number listed is 6440248.
Why didn't you say your 40248 pump was an original 65 Corvette 396 pump? At least now I know to keep my eyes open for NOS 6415962 (AC 40248) pumps at the swap meets.
DaveComment
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Re: AC fuel pump date code research data
Dave, I am sure I did say it was a 396 pump, it was probably about mid last year...or it was in one of these other threads...Comment
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Re: AC fuel pump date code research data
Ron,
You may have mentioned this in another thread. I don't know if you have noticed but I tend be very "wordy" and in my posts and give a lot of specific references. You can NOT be vague in technical writing. Back in college liberal arts majors could be "wordy" and basically say nothing but engineers have to be very specific. You should always double check your work as well as check for spelling errors.
DaveLast edited by David L.; February 28, 2011, 01:50 PM.Comment
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Re: AC fuel pump date code research data
There is a 4657 pump currently on Ebay stamped "4657LD" (Dec. 1964). I received a reply on my question to the seller and it has a "64" casting with 10 hash marks (Oct. 1964) in the hole about the outlet. This would be correct for an "early" 1965.
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