Fuel pump date code? David Liukkonen

[Randy C.]

Re: Fuel pump date code? David Liukkonen

Kevin,

Your ORIGINAL 1972 Corvette (May 10, 1972) fuel pump stamped "219K40956" (where I believe "219K" = the 219th day of 1971 or August 7, 1971) seems to fit in with my fuel pump date coding theory where E=1965, F=1966................and K=1971. Somewhere between 1969 and 1971 the AC fuel pump date code system changed from the 2-letter date code to the 3-number & 1-letter date code. Thanks for your input.

Dave

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The AC fuel pump on my '71 base engine auto (trim tag date E14, engine pad C11S104001 V1201CJK) is stamped 215K40769. I bought the car when it was nearly 8 years old but I always thought the fuel pump was original. Am I hearing now that the "K" means calendar year 1971? I could go with model year 71..........!

For my car, I thought that the "215" on the fuel pump stood for the 215th day of 1970 (8/3/70), which is consistent with some other dates under the hood (intake manifold H190, A/C compressor 081202, and fan H70, for example). Nearly all of the dates under the hood are AUG and SEP 70 dates, except for the starter and master cylinder, which are late JUL 70 dates. I always thought these dates were kind of "ancient" for a car built on DEC 14, 1970, but then there was the stop in production for a couple of months in mid-SEP to late NOV which could explain those "ancient" dates.

Any thoughts on my fuel pump? Thank you!

Randy C.

[Warren F.]

Re: Fuel pump date code? David Liukkonen

David,

My fuel pump from my 1971 LS6 Corvette has stamped on its flange
19K40770

I will have to swap cars on the Kwik Lift to see the other 1971 LS6 cars fuel pump stamping.

[Warren F.]

Re: Fuel pump date code? David Liukkonen

It looks like typical monthly production is approximately 2600 cars, however for September it looks to be 1014 cars, 0 in October and then only 449 for November. The rest of the months look typical.

[David L.]

Re: Fuel pump date code? David Liukkonen

David,

My fuel pump from my 1971 LS6 Corvette has stamped on its flange
19K40770

I will have to swap cars on the Kwik Lift to see the other 1971 LS6 cars fuel pump stamping.

Wayne,

According to my date code theory your fuel pump may be dated the 19th day of 1971 (Jan. 19, 1971). What is the engine assembly date? The AC 40770 fuel pump (GM # 6470309) was used on 1970-1972 Corvettes
w/4BC (454) models accroding to my 1972 Corvette parts catalog.

Dave

[David L.]

Re: Fuel pump date code? David Liukkonen

-------------------------------
The AC fuel pump on my '71 base engine auto (trim tag date E14, engine pad C11S104001 V1201CJK) is stamped 215K40769. I bought the car when it was nearly 8 years old but I always thought the fuel pump was original. Am I hearing now that the "K" means calendar year 1971? I could go with model year 71..........!

For my car, I thought that the "215" on the fuel pump stood for the 215th day of 1970 (8/3/70), which is consistent with some other dates under the hood (intake manifold H190, A/C compressor 081202, and fan H70, for example). Nearly all of the dates under the hood are AUG and SEP 70 dates, except for the starter and master cylinder, which are late JUL 70 dates. I always thought these dates were kind of "ancient" for a car built on DEC 14, 1970, but then there was the stop in production for a couple of months in mid-SEP to late NOV which could explain those "ancient" dates.

Any thoughts on my fuel pump? Thank you!

Randy C.

Randy,

What you are "hearing" is only theory. Nothing is cast in stone. I am still collecting data but at this point it time it appears that the "K" possibly siginifies the year 1971. You said you bought the car when it was nearly 8 years old. It is very possible that the fuel pump was changed during the first 8 years after it was made. Time will tell if my fuel pump date code theory makes any sense.

Dave

[David L.]

Re: Fuel pump date code? David Liukkonen

I have a 40248 65 396 pump that was on the car since 74 I believe as a re-built unit, it has no number? A B or perhaps an 8. see pic attached...

A 40366 66 427 pump I have has 9H40366.

Any ideas???

I think I have to find that guy I went to grad school with that worked up there...

Ron,

The 1965 Corvette (396) fuel pump, GM # 6415962 (AC # 40248, I assume), appears in my May 1965 Chevrolet parts catalog but not in my Oct. 64 or Jan. 65 parts catalogs since the 396 made it's debut in the middle of the 1965 production year. GM # 6415962 was discontinued in August 1967 and replaced with GM # 6416245 (AC #40366) which is the 1966 Corvette 427 fuel pump.

I tend to think that your "40248" fuel pump is an original. The "4657" fuel pumps made before 1965 did not have the 2 date code letters while those made in 1965 do have these 2 date code letters. Your "40248" pump was probably made in late 1964 or possible early 1965 for the "new" 1965 Corvette 396 engine. Can you even rebuild a "40248" pump? The "4657" pumps can easily be taken apart and rebuilt since they are assembled with screws.

I believe that your "9H40366" 1966 Corvette 427 pump is dated the 9th day of 1968 but only time will tell if I am correct.

That's my opinion.

Dave

[Warren F.]

Re: Fuel pump date code? David Liukkonen

Wayne,

According to my date code theory your fuel pump may be dated the 19th day of 1971 (Jan. 19, 1971). What is the engine assembly date? The AC 40770 fuel pump (GM # 6470309) was used on 1970-1972 Corvettes
w/4BC (454) models accroding to my 1972 Corvette parts catalog.

Dave

Engine assembly stamping T0227CPW

[Ronald L.]

Re: Fuel pump date code? David Liukkonen

That stop in production was "the" famous strike against GM if memory serves correct. A lot of people suffered through that time.

We need to see more pump to car dates to get a trend. Julian date coding is typical on automotive parts, just I do not recall it at GM in that time frame. Normal is what we see on starters, alternators, distributors, etc.

Could be a lot of things, the line or cell it came off of plus a month with part numbers differentiating the year.

[Mike E.]

Re: Fuel pump date code? David Liukkonen

Mike,

You are certainly entiltled to your opinion. How many other 1965 & newer AC fuel pumps have you studied in the past 20 years? 10?, 25?, 50?

David--
Exactly what are you saying to me with that response? I replied regarding only three fuel pumps. I said nothing about any other 65 and newer fuel pumps. Those that I mentioned were all on 71 LT-s, one on an early-post-strike car that had almost all parts dated July-September 1970, and another on a 30k-mile car built 148 cars from the end of production, with primarily June and July 1971 parts. If the "H" stands for 1968, help me understand what the LH then stands for, and how those two original pumps, on cars so far apart, as well as on a car in between, are all stamped LH. I'm very open to learning, and am very willing to be proven wrong. My primary study has been on compnents on over 1000 original 62's over the last 35 years, and I've written a number of articles on dating of cars/parts, so I'm only a Johnny-come-lately to the 71's.

[David L.]

Re: Fuel pump date code? David Liukkonen

I seem to have more support with my friends on the Nasty Z28 web side.
I started a thread yesterday entitled "Factory installed 1970 Z28 ans SS350 AC fuel pumps" and have got quite a bit of positive response during the first full day. If you are open minded about date codes on 1965 & newer AC fuel pumps you may find it interesteing.

[David L.]

Re: Fuel pump date code? David Liukkonen

David--
Exactly what are you saying to me with that response? I replied regarding only three fuel pumps. I said nothing about any other 65 and newer fuel pumps. Those that I mentioned were all on 71 LT-s, one on an early-post-strike car that had almost all parts dated July-September 1970, and another on a 30k-mile car built 148 cars from the end of production, with primarily June and July 1971 parts. If the "H" stands for 1968, help me understand what the LH then stands for, and how those two original pumps, on cars so far apart, as well as on a car in between, are all stamped LH. I'm very open to learning, and am very willing to be proven wrong. My primary study has been on compnents on over 1000 original 62's over the last 35 years, and I've written a number of articles on dating of cars/parts, so I'm only a Johnny-come-lately to the 71's.

Mike,
All I asked was how many 1965 and newer AC fuel pump have you studied and now I know the answer.
Dave

[Ronald L.]

Re: Fuel pump date code? David Liukkonen

Is that the web link? nastyz28 dot com?

There is support where people chip in with a photo, go out and crawl under the car and take a peek, ans then there is the other stuff.

From the two threads here for 65 we have one data point
66 a couple a 4H and the 6H I have.

Then there was some 67 to 71 info from some seemingly very important time periods in GM history.

I do not think we have broken the code. How many pumps do you have VIn data for to tie into a timeline?

[Tom F.]

Re: Fuel pump date code? David Liukkonen

Gentlemen:

I received the following e-mail from a friend who worked for Airtex for over twenty five years. He reported the following.


AC had a system I never paid real attention to it because I was more concearned with the part number so I could interchange. There were 2 sets of numbers on the flange. One on each side of the rocker arm. One was the part number, the other was a coded date. AC bought a lot of product from Carter, as I recall. The Feds were really strict on fuel pump manufactures and they had to code their product for recall purpose. The product could cause explosion, fire, ect. and had to have a code date in order to sell in the USA.

[Ronald L.]

Re: Fuel pump date code? David Liukkonen

25 years gets us back to 1985. I know by the 90's everything was seriously date coded for those same purposes mentioned.

Issue is we need to go back 20 more years...

[Tom F.]

Re: Fuel pump date code? David Liukkonen

You may have misunderstood the thread. It was referring to AC mechanical fuel pumps that were being purchased from Carter. To identify the product manufacturer, additional letters or an alpha number were placed on the flange along with the part number.