Ralph Spears asked me to post these PICs. He stated the one with the circle around the AC came in the smaller box (on the left.) I'm sure he'll chime in to further describe them.
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Kramden -
Re: AC Fuel Pumps
The circle is likely due to an insert being built into the mold to allow the part to be produced with or without the "AC" logo. Remember these days AC is just a marketing organization, so all "AC" logo parts are produced by outside vendors. It would be interesting to know what the manufacturing dates are on the Boxes, generally small print on the bottom of the box or one of the flaps.Bill Clupper #618 -
Re: AC Fuel Pumps
Bill------
Yes, AC ceased the manufacture of mechanical fuel pumps ABOUT 1985. After that time, these pumps were outsourced to other manufacturers. However, for awhile the outsourced pumps continued to have the AC logo cast on them. I suppose that GM had some sort of requirement that the contract manufacturers continue to brand the pumps AC. Or, it may be that GM transferred its tooling to the contract manufacturers who used it to produce some of their own-branded pumps as well as AC pumps.
In any event, at some later time the "AC" logo was dropped altogether. I suppose that at some point AC-Delco decided that the branding was no longer important (or, important enough to incur an increased piece cost to sustain the practice). Someone may have figured that all that was important for branding purposes was the box. After all, virtually no parts supplied in AC Delco boxes were manufactured by GM anymore.In Appreciation of John HinckleyComment
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Re: AC Fuel Pumps
The boxes are dated 86 I still have the receipt in the box when i bought them in Oct.1986Comment
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Re: AC Fuel Pumps
The difference in the 'yellow-gold' plating is interesting! Not a plating expert, but the one on the left looks like 'yellow di-chromate' over zinc as opposed to 'yellow cad' . Any plating scientists out there?
'73 LS-4 454Comment
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Re: AC Fuel Pumps
Pictured below in my NOS AC 40777 fuel pump for my 1970 Camaro SS350. Unfortunately the pump is stamped "263K40777" on the flange (263rd day of 1971). There is no date code on the box. There is just the plain "AC" casting without any circle.
DaveComment
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Re: AC Fuel Pumps
My original fuel pump on my '71 LS6 is similar in appearance with the only difference being the position of the 3 inlet/outlet location on the bottom. Mine is dated 19K40770. Car has engine assembly of T0227 and trim tag date of H18.Comment
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Re: AC Fuel Pumps
Any issues with running today's gas in a pump that's been sitting in a box for 25 years ?Comment
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Re: AC Fuel Pumps
John------
In my opinion, yes. I believe that the elastomeric components of the pumps have changed formulation over the years to be compatible with modern fuel formulations, especially ethanol blended fuels.
However, do I think that immediate, catastrophic failure will occur if one uses an old pump with modern fuel? No, I do not. I just think the life of the pump will be shorter than one might otherwise expect. I don't mean in terms of miles, either. I mean in terms of time, regardless of miles driven.
I think that as a safety precaution and to avoid being stranded somewhere one should keep a close eye on the fuel pump for any sort of leaks.In Appreciation of John HinckleyComment
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Re: AC Fuel Pumps
Warren,
I would say that your "19K40770" pump is dated the 19th day of 1971 or 01/19/1971 which checks out with your Feb. 27, 1971 engine stamping and March 18, 1971 trim tag. The fuel pump was installed in St. Louis, not Tonowanda.
DaveComment
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Re: AC Fuel Pumps
David,
I did not know that they weren't installed at the engine facility, interesting.Comment
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