AC 4656 Fuel Pump-Restamp?

[Joe M.]

I purchased a 4656 fuel pump from Show Cars Automotive. I was expecting to see the "4656" stamped deep into the mounting flange, but the attached photos show how shallow the stamping is. Although the flange area is flat, I compared it to a 4656 that is shown in the 1958-1960 Restoration Handbook. The flange has the same characteristics; a middle seam that wraps around the corner, followed by a flat spot, then the seam continues around the flange. If it is a restamp, you would think they would have done a better job of stamping. As long as it works, it probably does not matter, unless NCRS judge believes it is a restamp.

Restamp or not?

[Joe M.]

Re: AC 4656 Fuel Pump-Restamp?

The remainder of the pump appears to be accurate, small AC on top, large AC on bottom cap, slot screws. I don't know of anything other identifying features of the 4656.

What type of metal is the pump arm to pump body pin made of on the originals? I thought I read somewhere that is was suppose to be brass.

[David L.]

Re: AC 4656 Fuel Pump-Restamp?

Joe,

I have never owned an original AC 4656 fuel pump but I have owned many original and NOS AC 4657 fuel pumps. A 4657 fuel pump has a hole near the outlet end with a 2-digit casting year with anywhere from 1 to 12 radial line segments (or hash marks) to denote the month.
Does your 4656 pump have the same?

BTW, a 4657 pump can be converted to a 4656 pump as shown in the instructions shown below.

Dave

[John H.]

Re: AC 4656 Fuel Pump-Restamp?

What type of metal is the pump arm to pump body pin made of on the originals? I thought I read somewhere that is was suppose to be brass.

Joe -

That pin is steel.

[Joe M.]

Re: AC 4656 Fuel Pump-Restamp?

No numbers except the faint 4656 stamped on the flange. Attached are a few more photos.

[Joe M.]

Re: AC 4656 Fuel Pump-Restamp?

My pump has the correct pin! If you notice, the pump shown in the ad is not made like the pump they sent me. I did not deal with a vendor on e-bay or Driveline and this may be the result. I would still like to see a photo of a documented original 4656. May not be time to call it a less than advertised deal yet.

[Russ S.]

Re: AC 4656 Fuel Pump-Restamp?

I realize this is a 4656 but I have seen original 4657s that are both ways-with the stamp deep and with them faint.

[Joe M.]

Re: AC 4656 Fuel Pump-Restamp?

Russ, that is the type of info I was looking for. A photo of an original 4656 would put me at ease. There is one good photo in the 1958-1960 Restoration Handbook, but need to see more pump body details. Probably a moot point since the vendor would never return my $$ anyway.

[David L.]

Re: AC 4656 Fuel Pump-Restamp?

No numbers except the faint 4656 stamped on the flange. Attached are a few more photos.

Joe,

Did you use a magnifying glass. The 2-digit number and hash marks are sometimes hard to see. Since your pump is rebuilt the bottom part might be from a different AC pump.

I have a rebuilt AC "6942GE" pump ("GE" = July 1965) with a "59" casting year in the hole near the outlet. In this case the rebuilt pump was made from a 1965 top section with a 1959 bottom section. This pump is in a NAPA box, NAPA part # 40004.

Dave

[Donald H.]

Re: AC 4656 Fuel Pump-Restamp?

Here are photos of mine off my 60. Of course I don't have an history so I can't say it is a period correct pump or not. The font on mine seems a bit different than yours, but not sure if that is meaningful.

Another thing I noticed is that yours seems to have a mold parting line around your flange except where the number is stamped, mine does not have that.

Don

[David L.]

Re: AC 4656 Fuel Pump-Restamp?

Don,

Assuming you have an original pump from your 1960 there should be a "59" or "60" casting with 1 to 12 "hash marks" inside the hole just above the threaded outlet hole.

Dave

[Donald H.]

Re: AC 4656 Fuel Pump-Restamp?

Don,

Assuming you have an original pump from your 1960 there should be a "59" or "60" casting with 1 to 12 "hash marks" inside the hole just above the threaded outlet hole.

Dave

I haven't been able to see the year date. But I did find the hash marks. They run from about 2 o'clock to 7 o'clock. It's hard to tell, but looks like 7 or 8 marks.

Don

[David L.]

Re: AC 4656 Fuel Pump-Restamp?

Don,

Try using a Q-tip with some solvent to clean the hole. A magnifying glass might also help.

Dave