40503 AC Joe Lucia

[Dale S.]

A person I know says his book says that a AC fuel pump 40503 supercedes the 40443 AC. Is this correct? If not what AC fuel pump number is originally correct for a 67 SB 327 HH(k19).Also what number or numbers supercedes that part number(40443.) Also is 40503 still a good number? I remember many supersessions in our AC fuel pump line in those days. Thank you Dale

[Joe L.]

Re: 40503 AC Joe Lucia

Dale-----

I don't know what an AC type 40443 is. However, I presume you're talking about about an AC type 40433. The 40433 was also known as GM #6416509. It was discontinued from SERVICE in February, 1967 and replaced by the GM #6416712 which is also known as AC type 40503. This fuel pump remains available from GM and Delco dealers. However, it's not a GM or DELPHI-manufactured piece. GM or DELPHI have not manufactured a mechanical type fuel pump since the mid-1980's.

[Dale S.]

Re: 40503 AC Joe Lucia

Sorry, Joe I ment to hit 40433 and hit 40443. I have a 40503 AC on my March 30, 1967 327 code HH. Since 40433 AC was discontinued in Feb. 1967, would the 40503 AC be correct for my car. I have a 40503 on my car now(without the raised AC). I have found 2 of the 40503 raised AC with the 6416712 on them, They have a "Insp by" rubber stamped on them. They are also in the original boxes. Would this be right for my C-2? Thank you for sharing your knowledge. Dale

[Joe L.]

Re: 40503 AC Joe Lucia

Dale-----

The 40433 was discontinued from SERVICE in February, 1967. That IMPLIES that it was also replaced for PRODUCTION before the end of the 1967 model year. However, I don't know if that actually happened, or not. It's possible that the 40433 was used right to the end of 1967. I suspect that it was replaced for PRODUCTION by the 40503 sometime before the end of the model year, but I don't know that, for sure and if so, when.

[Gerard F.]

Re: 40503 AC Joe Lucia

Joe,

The fuel pump called out in the 67 AIM for the base engine is #6440433. The one I took my June 67 base engine(which I believe to be the original) is stamped PO40433 on the flange, and has AC markings and vent holes supposedly in the right places.

The one I put on about 5 years ago was an AC Delco (from Paragon), the cheap one without markings. The box says ACD# 40503, GM# 6416712.

Would they have put a discontinued fuel pump on my 67 at the factory?

Jerry Fuccillo
#42179

[Joe L.]

Re: 40503 AC Joe Lucia

Jerry-----

It was discontinued from SERVICE in February, 1967. As I mentioned, that does not mean that it was discontinued from PRODUCTION at the same time. Very often, parts are discontinued from SERVICE well AFTER they are discontinued from PRODUCTION (i.e. the parts are changed in PRODUCTION but they are not discontinued from SERVICE until all of the SERVICE inventory is exhausted). However, that does not appear to be what happened in this case. I don't know what the deal was here.

In any event, I believe that the only difference between the 40433 and the 40503 is a slight difference in the angular relationship between the inlet and outlet fittings. So, the pumps could really be used interchangeably. Perhaps, both types were used in PRODUCTION late in the 1967 model year. I just don't know.

[Dale S.]

Re: 40503 AC Joe Lucia

Thank you, Joe

[Rick S.]

Re: 40503 AC Joe Lucia

Dale,
Were you the buyer of that AC fuel pump on Ebay? If so, that was a good buy.
Rick