AC fuel pump date code research data

[Scott S.]

Re: AC fuel pump date code research data

Jim,

"GF" would be July 1966 with a May 1966 casting date.
I once owned a NOS "4657GF" pump but it had 6 hash marks.

Dave,

The casting mark shown in Jim Bensko's photo (picture #3 in post #3 above) reminded me of something I noticed on the back of my instrument cluster a while back. I didn't know whether it was "99" or "66", or what it meant, but it makes sense now. It looks the same as the casting mark in Jim's third picture, except for the number of hash marks.

A "66" with 8 hash marks would be an August 1966 casting. As the second picture shows, the assembly stamp is December 8, 1966. This is the original instrument panel from my Jan. 11, 1967 car. The dash cluster has been restored, but the ink-stamp date was covered to preserve it.

[John L.]

Re: AC fuel pump date code research data

David
Per your request:
I have what I believe to be the original fuel pump on my 1965 late april built, HE engine was built April 12th 1965 (owned since 1970, 35K miles) and pump rebuilt in the late '90s by me.
it is stamped 4657DE (I assumed April, 1965). Picture attached
MVC-002S.JPG

[David L.]

Re: AC fuel pump date code research data

John,

I would agree that it was original. The fuel pumps were installed in St. Louis not in Flint where the engine was made.

Dave

[Scott S.]

Re: AC fuel pump date code research data

Dave,

If the casting mark on the back side of the instrument panel face is the same date-stamping code/system as used on the AC Delco fuel pumps, wouldn't this mean that AC Delco also manufactured the instrument cluster housing itself? Did AC Delco manufacture all of their own parts, or did they obtain some parts from from other manufacturers? The large rectangular sticker on the back of the dash cluster says "AC - Made in U.S.A." at the bottom.

Are there any other parts that use this same date code marking, with "year inside a circle" and 1-to-12 hash marks indicating month?

[David L.]

Re: AC fuel pump date code research data

Scott,

I have had a few 63-67 dash clusters over the last 30 years but I have never noticed that there were made by AC. I sold them years ago. The casting date code format is definitely the same (year inside a circle of 1 to 12 radial hash marks). If AC could make fuel pumps I don't see any reason why they could not have made the dash cluster housings as well. Since the casting date format is the same I would say they did.

Dave

[Terry M.]

Re: AC fuel pump date code research data

Hi David,
My original fuel pump (HF40482) is from my 1967 427 Corvette (build date of November, 1966).
Terry

[Terry M.]

Re: AC fuel pump date code research data

I know I have posted it on here before. I just hope it will let me do it again.

LN40708 from my 1970 LT! January 29, 1970 on the trim tag.

It will be fun with all these Terry Ms here.

[David L.]

Re: AC fuel pump date code research data

Hi David,
My original fuel pump (HF40482) is from my 1967 427 Corvette (build date of November, 1966).
Terry

Terry,

The "HF" date code (August 1966 in my opinion) seems to fit with the Nov. 1966 build date but there are still "veteran" NCRS members that say that fuel pumps are not date coded. I wonder how many more examples it will take? I believe it will take decades before fuel pump date codes are added to the judging guides.
Thanks for your information.

Dave

[Terry M.]

Re: AC fuel pump date code research data

Terry,

The "HF" date code (August 1966 in my opinion) seems to fit with the Nov. 1966 build date but there are still "veteran" NCRS members that say that fuel pumps are not date coded. I wonder how many more examples it will take? I believe it will take decades before fuel pump date codes are added to the judging guides.
Thanks for your information.

Dave

The challenge regarding fuel pump date codes is reading them on the judging field. Many Judging Manual Teams would not bother to add the date codes because they can not be judged. The reluctance may have nothing to do with whether the individuals believe they are date coded or not.

[Ronald L.]

Re: AC fuel pump date code research data

Scott,

You see this year inside a circle on AC Spark Plug dates boxes generally after 1967, depending upon the box supplier.

[David L.]

Re: AC fuel pump date code research data

I know I have posted it on here before. I just hope it will let me do it again.

LN40708 from my 1970 LT! January 29, 1970 on the trim tag.

It will be fun with all these Terry Ms here.

Terry,

Yes, you did post your photo in another thread and it is STILL hard to read.
First of all the last digit on your fuel pump looks more like a "9".
My 1972 Corvette Parts Catalog lists GM # 6470110 (type 40709) for 69-72 Corvettes w/SHP 350 engines.
I don't think I have ever heard or seen an AC 40708 fuel pump.

In my study (the very 1st post) there are two 40709 pumps:
"LH40709" ("LH" = Dec. 1968) in a 1970 Corvette "V0114CTU" (Jan. 14, 1970)
"LH40709" ("LH" = Dec. 1968) in a 1970 Corvette "V0702CTK" (July 2, 1970).
It does seem odd that two 1970 Corvettes have the same pump with the same "LH40709" stamping made in December 1968. I wonder is AC rotated their fuel pump stock like the supermarkets so future Corvettes restorers would not be confused.

Have you ever looked at your "LN40708" pump with a good magnifying glass and good lighting?
It looks to me like it POSSIBLY could be "LH40709" but I could be wrong.

Dave

[Loren L.]

Re: AC fuel pump date code research data

I have what I believe to me the original 40083 fuel pump on VIN #23561.
It is INTERNALLY dated 65 with 4 marks. There is NO SUFFIX code on the flange of the pump.

Enclosed is research data that I have collected for many years studying the stamped date codes on factory installed AC fuel pumps.
_____________________________________________

AC re-buildable pumps (w/screws)
______________________________________________

"4657" , "64" casting year w/3 hash marks (Mar. 1964)

"4657KE" (Nov. 1965), "65" w/10 hash marks (Oct. 1965)

"4657KE" (Nov. 1965), "65" w/9 hash marks (Sept. 1965)

"6842KE" (Nov. 1965), "65" w/?? hash marks. NOS pump

"6942LE" (Nov. 1965), from 1966 Chev. 283 "T1222GA"
(Dec. 22, 1965)

"4657EF" (May 1966), "66" w/3 hash marks (Mar. 1966)

"4657EF" (May 1966), "66" w/4 hash marks (April 1966)

"4657GF" (July 1966), "66" w/5 hash marks (May 1966),
NOS pump

"4657GF" (July 1966), "66" w/6 hash marks (June 1966), NOS pump

"4657JF" (Oct. 1966), "66" w/10 hash marks (Oct. 1966)

NOTE: I have a few "rebuilt" pumps that have dates that do NOT match because the rebuilders did NOT bother to match up the tops and bottom as these parts were mostly interchangeable.

______________________________________________

AC crimped type pumps (non-rebuildable)
______________________________________________

"FF40433" (June 1966), Early 1967 Corvette (VIN # 183)

"HH40669" (Aug. 1968), 1969 Camaro Z28, "V0912DZ" (Sept. 12, 1968)

"AI40503" (Jan. 1969), Service pump for 67 Corvette

"DI40658" (April 1967), Pump from my non-original 1966 Corvette engine. Possibly from an "early" 1967 Camaro as pump # 5656858 was replaced by # 6440524 as per 1967 Camaro AIM (revision record, 2/1/67).

"FG40433" (June 1967). Original pump on 1967 Corvette 327, VIN # 22049, engine dated June 29, 1967.

"CG40433" (Mar. 1967), Believed to be an original 1967 Corvette 327 pump from a friend on mine in Richmond, VA.

"LH40709" (Dec. 1968), Seems a bit too early for a 1970 LT1. "V0114CTU" (Jan. 14, 1970).

"DJ40726" (Apr. 1970), Original pump from 1970 Z28 made in Apr. 1970 (Nasty Z28 website).

"DJ40726" (Apr. 1970), from 1970 Z28 (Nasty Z28 website).

"?J40726" (???, 1970), from a 1970 Z28 made in Feb. 1970 (Nasty Z28 website).

"LI40726" (Dec. 1969), from a 1970 Z28 (Nasty Z28 website).

"LH40709 (Dec. 1968), Seems a bit too early for a 1970 engine stamped "V0702CTK" (July 2, 1970)

"8K40709" (8th day of 1971), 1071 LT1 eng. "V330CGZ"
(Mar. 30, 1971)

"19K40770" (19th day of 1971), 1971 LS6 "T0227CPW" (Feb. 27, 1971).

"219K40956" (219th day of 1971), 1972 Coupe (May 10, 1972).

"215K40769" (215th day of 1971), Seems a bit late for a
1971 eng. "V1201CJK" (Dec. 01, 1970).

"197J40726" (197th day of 1970), from 1970 Z28 (Nasty Z28 website).

_____________________________________________

I would appreciate it if anyone that still has the original AC fuel pump from his or her Corvette/Camaro/Chevelle/Nova post the appropriate information on this thread.

I am totally convinced that AC fuel pumps have a STAMPED date code incorporated into the stamped AC part number starting in 1965. I have never found a STAMPED date code on a 1964 or older AC fuel pump except on rebuilt pumps made with random parts.

I hope the non-believers will at least keep an open mind to my stamped date code theory.

Dave

[John H.]

Re: AC fuel pump date code research data

Scott,

I have had a few 63-67 dash clusters over the last 30 years but I have never noticed that there were made by AC. I sold them years ago. The casting date code format is definitely the same (year inside a circle of 1 to 12 radial hash marks). If AC could make fuel pumps I don't see any reason why they could not have made the dash cluster housings as well. Since the casting date format is the same I would say they did.

Dave

Dave -

That's correct - AC manufactured the complete midyear instrument cluster assembly; St. Louis added the switches, lighter, radio capacitors, and the harness.

[Terry M.]

Re: AC fuel pump date code research data

I may have to get it out again. Those pictures were retrieved from the virus damaged hard drive, and they are not the best quality. My engine is V0114CTU, but the engine assembly date will have little more than a general relation to the fuel pump date since the fuel pump was installed at St Louis. Perhaps the data you have is the correct number from earlier. What are the chances you have data from the same assembly dated engine, even if they did make say 50 or 100 LT1 engines on January 14?

It is hard to believe a fuel pump would have been around for two years before being installed. Even if that date were the raw casting date, and I doubt it is, two years is a long time.

[David L.]

Re: AC fuel pump date code research data

I have what I believe to me the original 40083 fuel pump on VIN #23561.
It is INTERNALLY dated 65 with 4 marks. There is NO SUFFIX code on the flange of the pump.

Loren,

I firmly believe that your "40083" pump with the internal April 1965 casting date is an original. I do not know when AC added the 2-letter suffix to the 40083 pumps.

Dave