AC fuel pump date code research data

**Ronald L.** · February 25, 2011, 01:15 PM

Re: AC fuel pump date code research data

Dave, 3 digit year and letter code is essentially confirmed you are spot on. Working on the transition and the two digit codes now...

It does look like both 2-letter and 1letter/1-3 number were used in 1968 calendar year which just might make sense....even though some may not like the date codes on their parts (include me in that bunch) it is what it is.

**Jim B.** · February 25, 2011, 01:17 PM

Re: AC fuel pump date code research data

David--here is another data point for you. Not a factory installed pump, but a NOS 4657 pump with its (presumed) original box. Stamped 4657GF, with a 66 and five hash marks. Hope this helps.

Attached Files

**David L.** · February 25, 2011, 02:50 PM

Re: AC fuel pump date code research data

Originally posted by Jim Bensko (42995)

David--here is another data point for you. Not a factory installed pump, but a NOS 4657 pump with its (presumed) original box. Stamped 4657GF, with a 66 and five hash marks. Hope this helps.

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. There also should be a date code on the box usually on one of the flaps. The box date could be significantly different because it's obviously made by a totally different manufacturer but it should be somewhat in the same time frame. At the time I sold my NOS 4657 pumps in the 1980's I did not record the date code on the box.

Dave

**Ronald L.** · February 25, 2011, 04:43 PM

Re: AC fuel pump date code research data

Jim's picture of the box flap shows 11-65.

**David L.** · February 25, 2011, 04:57 PM

Re: AC fuel pump date code research data

Ron,

I guess I should have looked at the photo of the AC box.
It's pretty obvious. November 1965 is in the same time frame as far as "over the counter" parts go for Jim's July 1966 fuel pump.

And who was it that said AC fuel pumps were not STAMPED with a date code after 1964?

Dave

**Domenic T.** · February 26, 2011, 02:07 AM

Re: AC fuel pump date code research data

Dave,
Good job. I looked in the shop and have one of the AC rebuildable pumps that I couldn't find in any of my books.
Any idea what it is? It is chevy or at least works on one.

All I can find is the 4661 on it.

I have a carter that looks similar but think it is for a chevy marine engine. I don't think any chevy's came with a carter or did they?

DOM

Attached Files

**David L.** · February 26, 2011, 11:02 AM

Re: AC fuel pump date code research data

Dom,

My 1963 Chevrolet Parts Catalog (Oct. 62) lists GM # 5621629 as a fuel pump for 58 PASS. (283)(exc. F.I.) and 58 Ser. 3 (truck) (8 cyl.) as is described as follows: "(stamped 4430 or 4661)". I sold my 1958 parts catalog years ago.

Is there a year casting (like "58") with some hash marks in the hole above the outlet?

Dave

**Domenic T.** · February 26, 2011, 01:02 PM

Re: AC fuel pump date code research data

Originally posted by David Liukkonen (3775)

Dom,

My 1963 Chevrolet Parts Catalog (Oct. 62) lists GM # 5621629 as a fuel pump for 58 PASS. (283)(exc. F.I.) and 58 Ser. 3 (truck) (8 cyl.) as is described as follows: "(stamped 4430 or 4661)". I sold my 1958 parts catalog years ago.

Is there a year casting (like "58") with some hash marks in the hole above the outlet?

Dave

Dave,
No I looked in the hole and didn't see anything but I will try to clean it and look again.

With your experience on these, what does the 4661 and other #s mean?

Also do the HP pumps differ by fule line size?

I purchased a kit for this pump from LIcorvette and was going to use it on a 63 /300 HP and wonder what the difference was in the 340 HP pump?

DOM

**David L.** · February 26, 2011, 02:43 PM

Re: AC fuel pump date code research data

DOM,

Try using a Q-tip with lacquer thinner or some other solvent.

The "4661" is part of the AC part number. I would ASSUME that the full AC part number is 5594661.
Example: GM part # 5621665 is a AC 4657 pump and is shown in the assembly manuals as 5594657.

Enclosed is a couple of photos of a copy of the instruction sheet from a NOS 4657 fuel pump which shows how is can be converted to fit other applications.

Do fittings for a 3/8" fuel line fit into your "4661" pump?

Dave

Attached Files

**Domenic T.** · February 26, 2011, 03:49 PM

Re: AC fuel pump date code research data

Dave,
Funny you said Q tip, I was in there with one and MEK instead of laquer thinner.
I unscrewed the fitting and the hole is the same size as the one that I cleaned looking for the #s. Found none and maybe this pic will show the inside where I cleaned.

It looks like it would take a larger fitting.

DOM

Attached Files

DSC00489.jpg (66.3 KB, 644 views)

**Philip C.** · February 26, 2011, 11:44 PM

Re: AC fuel pump date code research data

Originally posted by David Liukkonen (3775)

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

Hello Dave I have an NOS in the box 6842 HE with 65 and 8 lines for you list. Phil 8063 (409 pump if I recall)

**Domenic T.** · February 27, 2011, 12:04 AM

Re: AC fuel pump date code research data

Dave,
The 3/8 fitting fits just fine, is that the difference between the HP and the standard?

DOM

**David L.** · February 27, 2011, 01:03 AM

Re: AC fuel pump date code research data

DOM,

I do not know when AC started putting the 2-digit year casting w/hash marks on their pumps. I assume your pump was probably made in 1958 or so.

I don't know if your pump will work on your 1963 without reworking the fuel lines. Do the inlet and outlet threaded holes on your pump line up like the 4657 pump (see photo) or can you modify your pump so that they do?

Dave

Attached Files

002 (Small).JPG (23.5 KB, 581 views)

**David L.** · February 27, 2011, 01:09 AM

Re: AC fuel pump date code research data

Originally posted by Philip Castaldo (8063)

Hello Dave I have an NOS in the box 6842 HE with 65 and 8 lines for you list. Phil 8063 (409 pump if I recall)

Phil,

August 1965 ("HE) and August 1965 ("65" w/ 8 hash marks).
Sounds like the the pump was made in August 1965 but I'm sure the non-believers would disagree.

Is there a date code on the AC box?

Dave

AC fuel pump date code research data

AC fuel pump date code research data

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