Odd 4657 fuel pump for 1963?

[John R.]

Posted this in another thread, but wanted to start a new one. David Liukkonen has shared his thoughts, but was wondering what some other members thought? This 4657 top section has the characteristics of a later 40083 with the 2 gussets, but it is dated August 1962. Has anyone seen a 4657 top section like this? How would it judge? It is not what we typically think a 4657 top section should look like. Thanks.

[John R.]

Re: Odd 4657 fuel pump for 1963?

Also, I see that the font size of the 4657 stamp on the flange is larger than what I have read on this board previously. If I recall correctly early pumps have smaller font size and later pumps have larger font size. This pump is early with large fonts.

[John R.]

Re: Odd 4657 fuel pump for 1963?

Has anyone seen a 4657 fuel pump top section like this one? I have not, so it may just be common or possibly rare? No frog pads, 2 gussets, circular vs oval shape of area that the AC is molded into, large part # stamped into the flange yet early dated pump??? Since the pump top section is dated August 1962, does this not change what we typically believe the production 4657 should look like? Or could this be a pump for 1963 with L84 or L76? I doubt this because it has the same part #, 4657.Curious too, does the top section of the fuel pump have characteristics that make suitable for different types of engines/hsp or is it really just a part the is applicable to all engines/hsp? If there is no difference, than maybe the answer is that there were several molds used by the manufacturer and this is just an unusual 4657?How would this top section judge on a 1963 vette?

[Harry S.]

Re: Odd 4657 fuel pump for 1963?

John, I have not seen one like you have.

[John R.]

Re: Odd 4657 fuel pump for 1963?

Harry, thank you very much for the reply. This one seems to be stumping everyone... Anyone else seen a 4657 like this one? I guess if this exists it has to be correct for a 1963 corvette application.

[John D.]

Re: Odd 4657 fuel pump for 1963?

John, I have been into 4657's for a long time. I have never seen such a beast as the one in your pics. Strange pump for sure. Thanks for the pics. JD

[John R.]

Re: Odd 4657 fuel pump for 1963?

John D., thanks for replying. Are all top sections on these pumps, no matter the different visual characteristics, set up the same. In other words, does the top section differ for SHP engines versus base engines? If there is no difference, then perhaps some top sections were simply made with different molds, like this one? Not sure what else explains the differences we see on this pump. Thanks

[Tracy C.]

Re: Odd 4657 fuel pump for 1963?

To answer the question of "How would it judge?" I would expect a 20% deduct for the Configuration element in the originallity collumn. It falls into the nontypical bucket.

Remember these pumps are made up of 3 pieces and can be assembled from many combinations of parts. The "4657" is just a stamp that could have been there originally or maybe added later by workbench elves....

The sad part of this deal is the JG was changed in the last revision to describe a 4657 pump I've never seen either. I questioned our fearless 63/4 team leader and he told me my question was "under review" but haven't heard from him for a few months on the outcome.

Maybe others should also inquire...

tc

[John R.]

Re: Odd 4657 fuel pump for 1963?

Tracy, thanks for the reply! Why the deduct on the configuration if it is dated August 1962? What is strange, at least to me, is it looks like a 40083 which is a later pump. Does not appear as though the workbench elves were experimenting with this one. Thanks again for your comments.

[Bob J.]

Re: Odd 4657 fuel pump for 1963?

How about a pic of the other side of the rocker arm pin.
You could write the TL, with a SASE for a reply, to see if he thinks it would pass judging.

[Timothy B.]

Re: Odd 4657 fuel pump for 1963?

Could it be possible the pump is stamped incorrectly and should be 40083, that would be logical except the date.

[William C.]

Re: Odd 4657 fuel pump for 1963?

inlet and outlet configuration are different between 4657 and 40083

[Mike E.]

Re: Odd 4657 fuel pump for 1963?

Tracy, thanks for the reply! Why the deduct on the configuration if it is dated August 1962? What is strange, at least to me, is it looks like a 40083 which is a later pump. Does not appear as though the workbench elves were experimenting with this one. Thanks again for your comments.

Because it's not typical factory production. And, because it would be a bit difficult for judges to see the August 1962 dating.
Fwiw, I have been looking at 4656 fuel pumps for 40 years, (the forerunner to the 4657, used 58-62) and have never seen that kind of a top on those.

[John R.]

Re: Odd 4657 fuel pump for 1963?

Bob, here is the photo you requested.

[Bob J.]

Re: Odd 4657 fuel pump for 1963?

Thanks, but its the staked (opposite) side that I'd like to see.