C2 Fuel Pump Date Cast?

[Pete L.]

While going over my leaking fuel pump (#40366), I have found a cast number within the throat of this pump. I have explored many past posts and I am not able to find any mention of this. I have posted a picture (hopefully) of this and would like to ask if any of you have encountered this.

I ask this in order to find out if this is possibly my original pump. My car is a 66, 427, built Nov. 65. The number found in throat of pump is 65, is this a cast date?
Thanks for any response. PL

[David L.]

Re: C2 Fuel Pump Date Cast?

The "65" is for the year 1965. Is there some hash marks (from 1 to 12) around the number "65" forming a circle (or more likely a partial circle) like a clock? If so the number of hash marks represents the month. Are there 2 letters stamped next to the "40366" on the flange?

Dave

[Pete L.]

Re: C2 Fuel Pump Date Cast?

David, There are eight raised bumps around the "65". The flange only has the stamped number 40366. One other number found is a small raised "8" inside the throat at the 9 oclock position.


Thanks for your response. PL

[David L.]

Re: C2 Fuel Pump Date Cast?

David, There are eight raised bumps around the "65". The flange only has the stamped number 40366. One other number found is a small raised "8" inside the throat at the 9 oclock position.


Thanks for your response. PL

The 8 "bumps" (or "hash marks") represent the month of August so the main part of the pump was cast in August 1965. I would say that this is the original pump for your 1966 Corvette 427 made in November 1965.

The very first non-rebuildable type AC fuel pumps pumps made by AC only had the 5-digit stamped part number but non-rebuildable AC fuel pumps made in later years had 2 letters added to the 5-digit part number which indicated the month and year that the pump was assembled.

Actual examples of non-rebuildable type AC fuel pumps:
"HF40482" (November 1966)
"FF40433" (June 1966)
"AG40433" (Jan. 1967)

The AC 40366 fuel pump = GM # 6416245 in Gr. 3.900

The earliest AC fuel pump with the 2-letter stamped date code that I have ever seen is a "4657 LD" AC rebuildable type pump (LD = Dec. 1964) with a "64" casting year with 10 "hash marks" (Oct. 1964). The 1963 and 1964 Corvette 4657 fuel pumps are just stamped "4657".

I stated a thread about AC fuel pump date codes in the link below.

Dave

https://www.forums.ncrs.org/showthread.php?84774-AC-fuel-pump-date-code-research-data

[Glenn B.]

Re: C2 Fuel Pump Date Cast?

Wow!
Thanks for the info Dave. A couple of us were looking at this pump trying to determine its originality. Now we know!
Glenn


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[David L.]

Re: C2 Fuel Pump Date Cast?

Glenn,

I would say your "BF40366" pump was assembled in February 1966. Is it the original pump from for car? If so, what is the body build date?

Dave