A/B Fuel Pump - Date Code

For those who obsess about exactly how their 356 left the factory!
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MarioManzo
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Location: Sacramento, CA

A/B Fuel Pump - Date Code

#1 Post by MarioManzo » Sun Dec 02, 2018 4:32 pm

Is there any way (like the Pierburg fuel pumps) to tell the date when the A/B Fuel pumps were made. Also, I've found two variations in the ones I have (and three looking through photos on the internet). Attached are some pics of the differences I found in the two I have.

1) "EIN" and "AUS" are different sizes
2) One has no "DVG" symbol on the top piece
3) One has "Made In Germany" on the base. The other one has a symbol in an oval.
4) One has no numbers on the side of the pump.
5) One has numbers on the bottom of the base. The other one has a round form, and looks like where the plunger went on pre-a fuel pumps.
6) the "2" on the inside of the base are opposite.

It's my supposition that the one with the round form on the base (where the plunger used to go) is an older version, and the one with "Made in Germany" is the newer one. That said, no clue on what dates that would correspond to. Ultimately, my question is, what would be correct for a 59 car?
Attachments
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Rainer Cooney
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Re: A/B Fuel Pump - Date Code

#2 Post by Rainer Cooney » Sun Dec 02, 2018 6:09 pm

Hi Mario, One of the more important differences you failed to mention was the plunger pivot pin. Early cars had this pin staked in and later cars had the "C" clips. Your car should have the later style with clips.

MarioManzo
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Re: A/B Fuel Pump - Date Code

#3 Post by MarioManzo » Mon Dec 03, 2018 12:25 pm

Hi Rainer, thanks for pointing that out. I was curious if the c-clips had just fallen off, but clearly the tube is too short. So, looking like the other one is more appropriate and there is no way to date code these (like Solex carbs, and unlike the Pierburgs). Thanks, Mario

Jan Kolm
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Re: A/B Fuel Pump - Date Code

#4 Post by Jan Kolm » Tue Dec 04, 2018 12:16 am

There are no known date stamps on the fuel pumps.

The only way to get an approximate date is to build a database with the serial numbers of known (or suspected) original fuel pumps and match them up against the build date of the engine and/or car.

There is a related thread in this forum that covers the cutover from the A/B "monkey-motion" pumps to the 356C straight-line motion fuel pumps in mid-calendar year 1963.
Jan Kolm
356 Registry #1066
1960 1600N Coupe

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James Davies
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Re: A/B Fuel Pump - Date Code

#5 Post by James Davies » Thu Dec 06, 2018 4:55 pm

The Rokal-built ones are earlier I believe. These have (RK) stamp as seen in your 4th photo on the left. Rokal made these for DVG.

MarioManzo
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Location: Sacramento, CA

Re: A/B Fuel Pump - Date Code

#6 Post by MarioManzo » Sun Dec 09, 2018 11:43 pm

Thanks everyone, very helpful information on the subtle nuisances and that they aren’t marked with a date code.

...and seems like someone probably could build a database and eventually date code them from the serial numbers, but that probably falls in the priority list after knowing how many bites it takes to get to the center of a Tootsie Pop :D :P :wink:

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