Internally Cast Fuel Pump Date Code

[Joe C.]

Here is a diamond similar to the one that Terry referred to in the thread: "Fuel pump date code? David Liukkonen"

[Terry M.]

Re: Not to Hijack Terry's Thread, but............

I think it is a different diamond -- mine is stamped. Joe's is cast. Mine is outside, Joe's is internal.

[David L.]

Re: Internally Cast Fuel Pump Date Code

Here is a diamond similar to the one that Terry referred to in the thread: "Fuel pump date code? David Liukkonen"

Joe,

Is that part of a "40083" AC fuel pump?

Is that a "71" casting near the 6 "dots"?

Dave

[Joe C.]

Re: Internally Cast Fuel Pump Date Code

Joe,

Is that part of a "40083" AC fuel pump?

Is that a "71" casting near the 6 "dots"?

Dave

Yes 6440083, and yes.
I assume that this pump was cast on the 324th day of 1965.
Do you know what the diamond P is ?
What does the "71" signify, and is that what tipped you that it's a 6440083 pump?
My best wild-assed guess is that the dots signify shift and/or time of day.

[Terry M.]

Re: Internally Cast Fuel Pump Date Code

Yes 6440083, and yes.
I assume that this pump was cast on the 324th day of 1965.
Do you know what the diamond P is ?
What does the "71" signify, and is that what tipped you that it's a 6440083 pump?
My best guess is that the dots signify shift or time of day.

Joe,
Ordinarily I would tell you that "71" means 1971, and the dots are for the month. I count six dots, so that would be June of 1971 -- but that date doesn't fit with the rest of your story.

[Joe C.]

Re: Internally Cast Fuel Pump Date Code

Joe,
Ordinarily I would tell you that "71" means 1971, and the dots are for the month. I count six dots, so that would be June of 1971 -- but that date doesn't fit with the rest of your story.

Terry,

The 6440083 pump was used for 1964-65 SBC with SHP; in 1966 it was used with all SBC. It was not used in production after 1966. I couldn't say how long they were used in service.
The "5324" date makes it a good fit for an early 1966 SBC Corvette.

[Terry M.]

Re: Internally Cast Fuel Pump Date Code

Terry,

The 6440083 pump was used for 1964-65 SBC with SHP; in 1966 it was used with all SBC. It was not used in production after 1966. I couldn't say how long they were used in service.
The "5324" date makes it a good fit for an early 1966 SBC Corvette.

Joe,
It has been too many years since my youth when I had a rebuildable fuel pump apart. Is this part you show in the photo the same part with the stamped date code on it?

[Patrick H.]

Re: Internally Cast Fuel Pump Date Code

Joe,

Is it an original pump? Are you sure?

That diamond "P" looks an awful lot like the P logo that Paragon puts on parts that they reproduce.

Patrick

[Bob J.]

Re: Internally Cast Fuel Pump Date Code

Joe,
I think its June - 1971 (6-71), that pump was available in service a very long time.Bob

[Joe C.]

Re: Internally Cast Fuel Pump Date Code

Joe,
It has been too many years since my youth when I had a rebuildable fuel pump apart. Is this part you show in the photo the same part with the stamped date code on it?

Terry,

It is the main body, or center section from the rebuildable type pump. The sheet metal or cast pulsator cover mounts with 4 screws, to the surface facing you in the photo. The surface facing away, with 10 screws, mounts the upper section of the pump, which corresponds to the part shown in your thread, which is stamped and mounted to the engine block.

Joe

[Terry M.]

Re: Internally Cast Fuel Pump Date Code

Terry,

It is the main body, or center section from the rebuildable type pump. The sheet metal or cast pulsator cover mounts with 4 screws, to the surface facing you in the photo. The surface facing away, with 10 screws, mounts the upper section of the pump, which corresponds to the part shown in your thread, which is stamped and mounted to the engine block.

Joe

And you know that the part we are looking at and the part with the stamp on it were mated for life?

[Joe C.]

Re: Internally Cast Fuel Pump Date Code

And you know that the part we are looking at and the part with the stamp on it were mated for life?

Terry,

Yes, I do. The newer pumps, used for 396 Corvette in 1965, 427 Corvette in 1966, and all Corvettes thereafter, appear to be (although am no "expert" on the newer style pumps, nor am I on the older style pumps, either) one piece potmetal with a swaged-on lower sheetmetal cover.

What is your point?

[Terry M.]

Re: Internally Cast Fuel Pump Date Code

Terry,

Yes, I do. The newer pumps, used for 396 Corvette in 1965, 427 Corvette in 1966, and all Corvettes thereafter, appear to be (although am no "expert" on the newer style pumps, nor am I on the older style pumps, either) one piece potmetal with a swaged-on lower sheetmetal cover.

What is your point?

So there were no replacement parts made for your pump after 1965? Or the newer replacement parts were a different configuration? Is that the situation?

I have never paid a lot of attention to the fuel pumps before 1968. All the ones I am familiar with are the sealed uints; so you are going to educate me here.

[David L.]

Re: Internally Cast Fuel Pump Date Code

Joe,

I agree with Bob Jorjorian. I believe that part of the pump was cast in June 1971 (6 dots with the "71" casting). What is the complete stamping on the edge of the flange which incorporates the number 40083? Are there 2 extra letters or 3 extra numbers along with a letter?

I have owned two 40083 fuel pumps (GM # 6415325 in Gr. 3.900) over the past 30 years. Both had the "AC" casting along with a stamped steel base. One was stamped "40083" on the edge of the flange along with a "PT 5623145" casting on the block mounting face. Another one had a "40083 IJ" stamped on the edge of the flange along with "5623145" cast on the block mounting face. I believe the "IJ" part of the stamping is a date code for Sept. 1970. The AC 40083 pump (GM # 6415325) was sold over the counter for many years as the part number appears in my 1965 Chevrolet parts catalog (Oct. 64), my 1982 Corvette Parts Catalog (Nov. 81) and all the parts catalogs in between.

Is the base stamped steel or cast? I have seen both types on 40083 fuel pumps at the swap meets but most were stamped steel. I think the cast base was probably the original type and the stamped steel base replaced it since it was cheaper to make.

Dave

[Joe C.]

Re: Internally Cast Fuel Pump Date Code

The first photo shows numbers cast within the upper section (the section which is flanged for attachment to the engine block).

The next photo looks like it could be "40083 LL".

This pump has a stamped steel pulsator cover.