#4657 Fuel Pump Question

[Jason S.]

The fuel pump for ALL 1963's, all HP ratings is simply referred to as "#4657" in the NCRS judging manual.

I'm looking for one for my car - and see several that have suffixes of JF, AF, CF, LD so far.
Are these suffixes date codes? Did the non-correct service parts have the suffixes?

Also - the manual states the cast bottom should have 4 screws holding it on - all the pumps I've seen have only 2.
Would these be service parts?

Here is a pic of a "rebuilt original" by one of the larger vendors that is listed as "correct" coded 4657JF. This vendor does differentiate from "replacement" and "correct" part numbers and show pictures of the AC tops being different, so they appear to understand the difference between "service" and original parts, FWIW:


Here is a pic of a used "original" by a large Corvette restorer/dealer coded 4657LD:

[Timothy B.]

Re: #4657 Fuel Pump Question

Jason,

The suffixes you mention next to the 4657 stamping are date codes and I don't believe that started until sometime in 1965. The 1963 4657 fuel pump should just show a 4657 stamp and does not have the two frog pads on the other side where the screws hold the assembly together.

It's better to do a archive search and read about this yourself so you can understand the little differences but from a functional point of view they all work the same.

One more thing, Merry Christmas...

[Tracy C.]

Re: #4657 Fuel Pump Question

The fuel pump for ALL 1963's, all HP ratings is simply referred to as "#4657" in the NCRS judging manual.

I'm looking for one for my car - and see several that have suffixes of JF, AF, CF, LD so far.
Are these suffixes date codes? Did the non-correct service parts have the suffixes?

Also - the manual states the cast bottom should have 4 screws holding it on - all the pumps I've seen have only 2.
Would these be service parts?

Here is a pic of a "rebuilt original" by one of the larger vendors that is listed as "correct" coded 4657JF. This vendor does differentiate from "replacement" and "correct" part numbers and show pictures of the AC tops being different, so they appear to understand the difference between "service" and original parts, FWIW:


Here is a pic of a used "original" by a large Corvette restorer/dealer coded 4657LD:

I believe the original 1963 assembly line pumps had no suffix following the part number. The 4 screw description for the bottom plate in revision 6 of the JM is a change from the 2 screw bottom plate described in revision 5. I have never seen anything other than a 2 screw bottom plate on a 4657 fuel pump. I asked Carlton about this right after the new manual was released. He was going to "check on this" for me. I've inquired a couple of time since then and have now just given up.

I do not agree with the 4 screw description. If I were you I would go with the 2 screw bottom plate because that is all you will find anyway.

Tracy

[Chuck G.]

Re: #4657 Fuel Pump Question

The first pic shows a 4657 pump with the incorrect (for 63) frog pads.

The second pic shows two correct (without frog pads) 4657 pumps.

[Frank D.]

Re: #4657 Fuel Pump Question

I had two of these pumps on the shelf at one time; neither had 4 screws...
Makes you wonder how that change crept into the JG...

[Chuck G.]

Re: #4657 Fuel Pump Question

Here's a better pic of the incorrect (for 63) 4657 pump showing the frog pads. You can see the pads at 9 o'clock and 3 o'clock in this photo.

[Frank D.]

Re: #4657 Fuel Pump Question

So now I have to add "frog pads" to my Corvette nature vocabulary along with "elephant ears", "dog dish", "chicken strap", and, others.
I'm too old to have to deal with all of this...

[Jason S.]

Re: #4657 Fuel Pump Question

Interesting - I was thinking the "frog pads" had to do with some descriptions claiming that the bottom was supposed to have 4 bolts instead of 2, rather than the way the bolt patterns appears from the top side. Perhaps the way I have been reading the JM and some blogs.
For reference, here is what Corvette Central claims to be correct on their "original rebuilt" pumps - which may be later parts with the 4657xx suffix as well:

Here is what Chicago Corvette Supply claims to be correct - note they claim their pumps are stamped with "4657" implying no suffix......but if you zoom in on their pic, it looks like (I suspect) they have re-stamped the mounting ear above the bolt hole. All the pumps I have seen thus far have the "4657xx" number on the underside of the bolt hole?


And here is 1 of 3 pumps that ProTeam has available for rebuild - all appear the same, and all appear to have the "4657xx" suffix:


The only reason I'm being so anal about this is because I have to replace my fuel pump ANYWAY, so I figured I'd take thee opportunity to be as "correct" as I could be while I'm there. I'm starting to think I'm getting a little too hung up on such a small detail?

[Frank D.]

Re: #4657 Fuel Pump Question

Save yourself some grief. Don't buy anything from Chicago Corvettes.

[Jason S.]

Re: #4657 Fuel Pump Question

Yeah........based on other discussions I've seen here, I've gotten that impression.
Given that they had a Nov.1962 date coded 3461S I needed, I did purchase an AFB through them.
I haven't seen it yet though...............

[Tracy C.]

Re: #4657 Fuel Pump Question

Interesting - I was thinking the "frog pads" had to do with some descriptions claiming that the bottom was supposed to have 4 bolts instead of 2, rather than the way the bolt patterns appears from the top side. Perhaps the way I have been reading the JM and some blogs.
For reference, here is what Corvette Central claims to be correct on their "original rebuilt" pumps - which may be later parts with the 4657xx suffix as well:

Here is what Chicago Corvette Supply claims to be correct - note they claim their pumps are stamped with "4657" implying no suffix......but if you zoom in on their pic, it looks like (I suspect) they have re-stamped the mounting ear above the bolt hole. All the pumps I have seen thus far have the "4657xx" number on the underside of the bolt hole?


And here is 1 of 3 pumps that ProTeam has available for rebuild - all appear the same, and all appear to have the "4657xx" suffix:


The only reason I'm being so anal about this is because I have to replace my fuel pump ANYWAY, so I figured I'd take thee opportunity to be as "correct" as I could be while I'm there. I'm starting to think I'm getting a little too hung up on such a small detail?

Welcome to the NCRS, we all have that same anality disease. The only configuration that is correct in these pictures is the one that Chicago Corvette has provided you. As Frank eluded to, that is not likely what they will send you, if in fact they send you anything at all. Do an archives search.

My advice is to keep looking for the correct casting configuration. A suffix stamp is easier to deal with than an incorrect casting feature. Read into that what you want, but I've heard that if you place a pump in a workbench drawer with a tube of JB weld on St Patty's day, the little leprechauns can make that suffix stamp go away.

Good luck with your search.
tc

[Joe R.]

Re: #4657 Fuel Pump Question

Yeah........based on other discussions I've seen here, I've gotten that impression.
Given that they had a Nov.1962 date coded 3461S I needed, I did purchase an AFB through them.
I haven't seen it yet though...............

Well I bet your credit card has seen the charge!!!!!!!

JR

[Frank D.]

Re: #4657 Fuel Pump Question

Inspect it CAREFULLY, here is the AFB Chicago Corvettes sent me (supposedly restored), fresh out of the bubble wrap, and it had the typical 'hot slot' corrosion from the use of wrong carb-to-intake gaskets. This was about 18 months ago.

I sent it back and told em what I thought about that.

You guys have me fizzed up about my 63 fuel pump now....guess I'll be under the car on the lift tomorrow doing some detective work !

[Timothy B.]

Re: #4657 Fuel Pump Question

Frank,

After you get the fuel pump straightened out go find a correct 1963 590 PCV valve. :-)

[Frank D.]

Re: #4657 Fuel Pump Question

Just checked - the fuel pump on my '63 250hp car has a flat bottom, is crimped together and I can see "AC" embossed up high on the mounting flange -- no way its correct (but works fine).