Fuel pump codes

[jdv69z]

I have what I believe is a 69 AC fuel pump. It has what appears to be "HH40669" stamped on the mounting flange of the pump. Can anyone decode this?

Jimmy V

[bertfam]

Jim,

The 40669 was used on all 69 302 and 350 engines. Sounds like it's the correct one, but I can't be positive without seeing it.

Ed

[Pacecarjeff]

The 40669 is correct for 1969 Z28, or SS350's.
If there is an 'AC' logo on both sides of the housing, then it is original 1969.

[jdv69z]

Thanks for the info; It does have the AC logo on both sides,  I do own a 69 Z/28 and this pump was on the car when I bought it; How would I post pic's, and what file size is appropriate? Pic's I have are approx 1.2 Meg. Lower resolution needed?

Jimmy V

[JohnZ]

Photos post best at 640x480 - that way they'll fill the screen, but won't require scrolling. 

[jdv69z]

After a Photoshop lesson, I believe I can post a pic of fuel pump.

Jimmy V

[DCL70SS]

I have what I believe is a 69 AC fuel pump. It has what appears to be "HH40669" stamped on the mounting flange of the pump. Can anyone decode this?

Jimmy V

I believe your "HH40669" AC fuel pump is dated August (the 1st "H") 1968 (the 2nd "H"). I have done a lot of research about AC fuel pumps during the last 20 years. It all started years ago when I found a 1966 Chevrolet 327 engine ("T0521HAR", May 21, 1966 with roch. 4bbl.) in a junk yard which had all of it's original components (carb, starter, distributor, fuel pump, etc.) according to the stamped part numbers and date codes.  I decoded the "4657EF" fuel pump to be May ("E") 1966 ("F").
My fuel pump date code theory is as follows:
The first letter is the month, A=Jan, "B"=Feb. ...........................L=Dec. (the letter "I" was used).
The second letter is the year, E=1965, F=1966, G=1967, H=1969.
NOTE: The AC pumps made in 1964 and prior do not have the 2 letter. I have an AC pump stamped only "4657" from a 1964.
Sometime in the early 1970's the date code changed to 3 numbers (the day of the year) and one letter (the year). I am still working ion this code.
Dave

[jdv69z]

Your Decode sounds correct, as the car is a 10B Oct 68 build. So Aug 68 would fit, I believe. Engine build is 0912DZ. Not sure if fuel pump was installed at that time.

Jimmy V.

[Stingr69]

I have what I believe is a 69 AC fuel pump. It has what appears to be "HH40669" stamped on the mounting flange of the pump. Can anyone decode this?

Jimmy V

I believe your "HH40669" AC fuel pump is dated August (the 1st "H") 1968 (the 2nd "H"). I have done a lot of research about AC fuel pumps during the last 20 years. It all started years ago when I found a 1966 Chevrolet 327 engine ("T0521HAR", May 21, 1966 with roch. 4bbl.) in a junk yard which had all of it's original components (carb, starter, distributor, fuel pump, etc.) according to the stamped part numbers and date codes.  I decoded the "4657EF" fuel pump to be May ("E") 1966 ("F").
My fuel pump date code theory is as follows:
The first letter is the month, A=Jan, "B"=Feb. ...........................L=Dec. (the letter "I" was used).
The second letter is the year, E=1965, F=1966, G=1967, H=1969.
NOTE: The AC pumps made in 1964 and prior do not have the 2 letter. I have an AC pump stamped only "4657" from a 1964.
Sometime in the early 1970's the date code changed to 3 numbers (the day of the year) and one letter (the year). I am still working ion this code.
Dave

Are you missing a letter for '68?

Thanks for the decode work. I like to save anything from my car that may have been on there originally. Not much is left but I do have a few potential pieces. The fuel pump is in my stash has been saved because it may be original. It was still functioning when I puilled it off a few years ago but if it really was "original" it was on borrowed time so I replaced it. It looks a lot like the one in the picture. I will take a look later to see if I need to save it or trash it. It might have been originally from the '68 Impala 327 that was in the car when I got it.

If the fuel pump part number and date line up on this piece, it will become part of the "permanant collection".

-Mark.

[Stingr69]

OK - how about "40987"? Anybody know what that would have been used on?  The numbers are faint but that is what it looks like. There seems to be a "209" in front of that and it might be a space before the "40987" but any info would be good.

Treasure or Trash?!?!

-Mark.

[Buzz1967]

I hope the mods don't mind me resurrecting this old thread and dusting it off.

I have a few questions concerning AC fuel pumps codes that I'd like to have answered. I have a motor date stamp of May 24, '67. My fuel pump has a date code of FH which would be June of '68. By what I've picked up from research and speaking with people, the motor should be dressed with components that are date stamped roughly a month earlier. So by my cyphering - that would call for a fuel pump date stamped as DG or possibly EG, correct?

I've also seen individuals refer to non-original pumps as being "service replacement correct". Are these replacement components something that a judge would view as acceptable? Can someone explain this to me?

Are there also AC pumps that were julian dated? If so, when to when?

Thanks to all that respond.

[JohnZ]

By what I've picked up from research and speaking with people, the motor should be dressed with components that are date stamped roughly a month earlier.

Fuel pump dating is unrelated to engine assembly dating; the fuel pump was installed at the car assembly plant, not at the engine plant, so the fuel pump needs to be dated prior to the car's final assembly date.

[jdv69z]

So what was on the fuel pump outlet at the engine plant when it was fired? A block off plate of some sort?

[JohnZ]

So what was on the fuel pump outlet at the engine plant when it was fired? A block off plate of some sort?

Nothing - it only ran for about 20-30 seconds, and there's no oil under pressure in that area.