Favor on fuel pump date code interpretation

[Keith M.]

So I have been offered a fuel pump with the ID below but I am travelling all week and no access to my JG. Anyone know what the date code below translates to?

251W40658

[Bill B.]

Re: Favor on fuel pump date code interpretation

Keith,

According to my 5th ed '70-'72 JG, all 1970 pumps had a two letter code for the month and year, while '71 & '72 have a Julian date code but the year code is not shown. Don't know about the '68 or '69 pumps.

"251" sounds like a Julian date for September.

[Patrick H.]

Re: Favor on fuel pump date code interpretation

Note that the "W" makes it a much later service replacement.
I would expect H for 1968, I for 1969, J for 1970

[Tom R.]

Re: Favor on fuel pump date code interpretation

Keith...you're well into the 80's with that date code. Here is a page from a TIMJG...well it wouldn't let upload a single freakin page but here it is.

13. FUEL PUMP
The upper body of fuel pumps are die-cast aluminum with a stamped-steel gold-irradiate lower extension crimped to the upper body. The upper body has a smooth die-cast look not a media-blasted finish. Near the fulcrum for the lever, the AC logo is cast into the narrow supporting portion. (See Fig. M 13.0)

The fuel-pump flange has a model stamp on the rear underside of its base (the flange that bolts to the engine). All fuel pumps use a Julian date code (three digits), followed by the last five digits of the part number. A letter year is used for the calendar year of pump assembly. A pump with the code 117S41240 is April 27, 1977 date code. (Fig. M 13.1 A fuel pump installed on a 1977-built in 1976, is expected to show a 1976-year code. Table 16 lists part numbers by model year.

The pump attaches to the engine by two zinc-plated indented hex-head bolts with integral split-ring lock washers. One bolt is 7/16" hex and another is 9/16."

A natural steel unpainted plate is between the fuel pump and engine block. It connects to the block by two zinc-plated indented hex-head screws with integral external star washers. Original gaskets under the fuel pump and plate are tan to dark brown. (See Fig. M 13.3) The date codes of reproduction and service-replacement pumps are stamped in a different location and the die-cast finish is not typical factory production.

I see uploading the table distorted the columns.

Table 14– Fuel Pump Part Numbers & Date Codes

Year	Engine	Date Code	Part Number
Stamped on Flange	Published Sources
1974 1975 1976	L48/L82	N P R	6640769	6470308
1977	S	6442140	6471216
1978	T
1979	U
1980-81

[Keith M.]

Re: Favor on fuel pump date code interpretation

Thanks all!!

[Dan A.]

Re: Favor on fuel pump date code interpretation

Is it possible that a fuel pump built in 1971 could have the Julian date and year stamped on it? The fuel pump on my early build 72 LT-1 is stamped 162140956 and that date would about right for the pump.
Thanks.

[Patrick H.]

Re: Favor on fuel pump date code interpretation

I would bet it's 162L if you have a very late 1971

[Tom R.]

Re: Favor on fuel pump date code interpretation

So I have been offered a fuel pump with the ID below but I am travelling all week and no access to my JG. Anyone know what the date code below translates to?

251W40658

My curiosity got the best of me so I Googled the 40658 and up popped this offer on eBay for pump, dated for a 68-69 Corvette. Date code configuration must be different for those two years...it may be a 327 vs. 350 thing.

https://store.tracyvette.com/item/20839/

[Patrick H.]

Re: Favor on fuel pump date code interpretation

My curiosity got the best of me so I Googled the 40658 and up popped this offer on eBay for pump, dated for a 68-69 Corvette. Date code configuration must be different for those two years...it may be a 327 vs. 350 thing.

https://store.tracyvette.com/item/20839/

The pump appears to be 172H40658

That would be the 172nd day of 1968, which fits. I'm not sure what you're seeing that's different?
June 20, 1968 assUming it's a 172.

[Dan A.]

Re: Favor on fuel pump date code interpretation

I would bet it's 162L if you have a very late 1971

Patrick,

I believe you’re correct. Would this date work for 72 LT-1 built 8/26/71?

[Patrick H.]

Re: Favor on fuel pump date code interpretation

Patrick,

I believe you’re correct. Would this date work for 72 LT-1 built 8/26/71?

Perfectly.