63 Fuel Pump

[Perry M.]

Re: 63 Fuel Pump

My car is a June car, 17622. I purchased it with 39,000 miles on it back in 1980. I believe the pump to be the original. It has the smaller AC on the top, 4657 in small fonts on the top of the flange and they face the motor, 63 in the hole with 4 hash marks, and it has the two frog pads. The screws appear to be black, although somewhat rusty but I can't distinguish any type of "S" letter on the heads. The two bottom screws appear to be zinc coated. It has the staple in the top diaphram and white zig-zag stripes on the lower. I hope this helps to clear up the frog pad issue. In conclusion, I believe mid to late cars all had frog pads.

Unfortunately, I need to rebuild my pump. Who sells the best, most NCRS correct kit. Hopefully with the staple and zig-zag striped diaphrams, maybe even ethonal compatible.

After removing the pump from the car and disassembling it, I discovered the ''S'' letter on the top of the screws. They are very small and some are barely visible.

[Loren L.]

Re: 63 Fuel Pump

I believe that the 4657 pump was used as early as 1958 on passenger cars. I don't think that the early 4657 pumps had the 2-digit casting year w/hash marks but I'm not 100% sure.

I would suggest to you another alternative - that fuel pumps that affix a two letter suffix are pumps done for service replacement. Not to confuse the issue but '65 #23561 has a 40083 fuel pump with May 1965 dates on the INSIDE and NO SUFFIX LETTERS.

[James W.]

Re: 63 Fuel Pump

I'm not trying to hijack this thread but is there anyone in the NCRS that is a reputable rebuilder of these pumps? I need to have my 4657 fuel pump rebuilt for my mid-January built 1964 Corvette.


Thanks,

James West

[Mel H.]

Re: 63 Fuel Pump

FWIW... I can confirm a Sept 64 #4657 pump, with no suffix letters and 2 Frog Pads. Bought this at a swap meet. Dont think it's ever been rebuilt.

Bottom cap has '64 with at least 5 hash marks (hard to tell..could be more). Middle part has 64 in hole with 9 marks... top clearly shows 64 with 9 marks, and has washer and swedge pin. Screws have "S", but are very small.

Like Perry, I need to rebuild this pump. Can anyone point to a vendor's rebuild kit that comes with white or yellow lines on the diaphram, a staple in the tab, and is ethanol compatible? Appreciate any thoughts.

[Timothy B.]

Re: 63 Fuel Pump

When I rebuilt my 4657 pump, I purchased the kit from Paragon and never had any problems with it. Make sure you broach the pump surfaces before assembly.

The 1963 shop manual has a good section on the fuel pump.

[Doug L.]

Re: 63 Fuel Pump

I'm not trying to hijack this thread but is there anyone in the NCRS that is a reputable rebuilder of these pumps? I need to have my 4657 fuel pump rebuilt for my mid-January built 1964 Corvette.


Thanks,

James West

I have had 2 '64 pumps rebuiolt by Hal Houghton. I was very pleased with his work.
Hal Houghton
The Classic Preservation Coalition
http://www.classicpreservation.com
houghton@classicpreservation.com
518-374-5078

[Mel H.]

Re: 63 Fuel Pump

I've checked with Paragon. They said their fuel pump rebuild kit is not compatible with ethanol, and no other supplier's is compatible either. Felt that was strange... why would you even offer a fuel pump that isnt compatible with modern day ethanol?

And, Paragon's has red lines on the diaphram vs while/yellow. So far, I havent found another rebuild kit that has correct color lines and is ethanol... but maybe I've just not looked in the right places yet.

[Ronald L.]

Re: 63 Fuel Pump

They "might" have thought you meant pure Ethanol, or maybe E85. Either will be aggressive to the system. E85 vehicles these days have nearly all special components.

They are getting them where everyone else does, So Cal or Asia.

[James W.]

Re: 63 Fuel Pump

I've checked with Paragon. They said their fuel pump rebuild kit is not compatible with ethanol, and no other supplier's is compatible either. Felt that was strange... why would you even offer a fuel pump that isnt compatible with modern day ethanol?

And, Paragon's has red lines on the diaphram vs while/yellow. So far, I havent found another rebuild kit that has correct color lines and is ethanol... but maybe I've just not looked in the right places yet.

I am sending my pump to Hal Houghton at Classic Preservation for a rebuild/restoration. One of the questions I asked him was if his rebuild kits were compatible with ethanol. His answer was yes. He also sells rebuild kits. A very nice individual to work with, give him a call at (518) 374-5078 or take a look on his website at www.classicpreservation.com.

Regards,

James West

[John R.]

Re: 63 Fuel Pump

Has anyone ever seen the top piece of a 4657 pump with the features shown in my 1st photo? The top piece is dated Sept 1962 or 62 with 9 hash marks. This top looks more like the 40083 used in later SHP motors, however as mentioned above, it is dated in 1962.

[David L.]

Re: 63 Fuel Pump

John,

Years ago I had a couple of "40083" AC fuel pumps. The top part (with the 2 "gussets") looked just like the top part of your pump. My pumps had a "5623145" casting number on the face that bolts onto the block without any casting date. One pump was stamped "40083" while the other was stamped "40083 IJ" (Sept. 1970).

Is there a casting date in the hole near the threaded outlet hole on your pump? You may need a magnifying glass. Is your pump a rebuilt pump? The size of the numbers in the "4657" stamping look larger than the original 4657 pumps that I once owned but it's been 20 or 30 years since I sold all my original and NOS 4657 AC pumps (dated Fall 1964 to 1966).

Dave

[John R.]

Re: 63 Fuel Pump

Dave, the pump has been rebuilt. I can not make out the number in the hole. Would you agree that the top section is indeed for a 1963 since it is dated 1962? And, since it is dated 1962, does that not void the common thought that the early pumps had smaller size stampings?Can anyone comment on whether it would pass judging with the different top design with the 2 gussets and the larger 4657 stamping? Are we to assume it does not matter what the top design looks like as long as it has AC on it and is stamped 4657 without letters? By the way, another difference in the top design I noticed is that the part with the AC logo is actually a circular shape versus the typical 4657 top you see is an oval shape.

[David L.]

Re: 63 Fuel Pump

Dave, the pump has been rebuilt. I can not make out the number in the hole. Would you agree that the top section is indeed for a 1963 since it is dated 1962? And, since it is dated 1962, does that not void the common thought that the early pumps had smaller size stampings?Can anyone comment on whether it would pass judging with the different top design with the 2 gussets and the larger 4657 stamping? Are we to assume it does not matter what the top design looks like as long as it has AC on it and is stamped 4657 without letters? By the way, another difference in the top design I noticed is that the part with the AC logo is actually a circular shape versus the typical 4657 top you see is an oval shape.

John,

The top part of the pump was definitely cast in September 1962 ("62" and 9 hash marks). If the "4657" stamping is original (and it appears that it is) then the pump would be for an "early" 1963 model. I have never had a 4657 AC pump made before the Fall of 1964. I have seen other 1963 and 1964 4657 AC pumps but never with the 2 "gussets". Since the pump has been rebuilt the bottom section might be from another pump. The casting date with the hash marks in the hole above the threaded outlet hole is the only way to tell. Have you tried cleaning out the hole with some solvent and a Q-tip?

Dave