Fuel Pump 40083
I found an NOS 40083 fuel pump which I have had on my shelf for many years, complete with its original GM box. It is pristine in appearance. Would it be safe to use as is with today's gas and is there anything I should do to it. Any recommendations for a rebuild. Thanks.
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Re: Fuel Pump 40083
Jack,
Back in the 1980's I bought several NOS 4657 AC pumps at various swap meets. I kept one of them ("4657EF" where "EF" =May 1966) to install in my 1966 Corvette (1980 to 1995 frame up restoration). The pump still works fine even though it is 45 years old but it only have about 4,000 miles of use (1995 to date).
BTW, could you tell me the complete stamped number on your NOS 40083 pump. Also, is there a date code on the box (probably on one of the flaps)?
Dave -
Re: Fuel Pump 40083
Jack, does the 40083 appear as stamped on the flange or on a litlle metal tab underneath one of the screw heads? Thanks.Comment
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Re: Fuel Pump 40083
Loren,
The 40083 is stamped on the flange. I did did a number 9 25 on the box flap which I now believe is the date code for September 25.Comment
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Re: Fuel Pump 40083
Loren,
That's 9 72
SorryComment
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Re: Fuel Pump 40083
Thanks David for your info.
JackComment
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Re: Fuel Pump 40083
To clarify my question somewhat, my information is that at sometime pumps that did not start life as 40083 pumps were being rebuilt to 40083 specs and then received the add-on tag for identity purposes.Comment
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Re: Fuel Pump 40083
Did the "re-purposed" versions include the distinctive magnesium top and the associated reinforcement "wings"?Bill Clupper #618Comment
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Re: Fuel Pump 40083
I'll have to dig out the one I have, but I believe the answer is "NO", which creates another issue for judging: does that metal tab qualify that piece as a "service replacement"? My opinion would be "Yes", but that explains why I am NCRS' only minus-rated judge.Comment
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Re: Fuel Pump 40083
The AC logo on the top would qualify it as a service replacement, but the configuration difference (should) also come into play, as well as the absence of the stamped number on the flange. Judges would have a wide leeway on that critter.Bill Clupper #618Comment
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Re: Fuel Pump 40083
Follow-up to David L's post #2:
Service replacement 40083 pumps are identical to production pumps except for the fact that service replacements have a 2 digit alpha date stamp suffix on the flange after the part number.
What is the complete stamping that appears on the mount flange?Comment
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Re: Fuel Pump 40083
Do they include the reinforcements as the one in the picture?Bill Clupper #618Comment
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Re: Fuel Pump 40083
Yes, as well as all of the other important identifiers, including the double stepped pivot pin boss, magnesium pump body and upper section, the "S" marked slotted screws, "AC" logo in plunger housing, etc etc.
See the article, which deals with a service replacement 40083 pump, in the Summer 2010 Restorer.Comment
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Re: Fuel Pump 40083
I dug out my "tagged" 40083; no reinforcements, no magnesium & no "AC on top OR bottom; bottom is also a "dome", not the 40083 style with the valley for the two screws in the middle.
The tag is stamped from the back with 40083 and "AC" in a circle.
None of the other pumps on hand have this, but the tagged pump on the inside of the attaching flange has "351" cast into it - about 3/8" tall.
With the "AC" on the tag, I'd have to grant "svc repl" points....
The two bolts that came off the '65 are 3/8" coarse thread, 7/16" head (with flange), a captured lock washer, lined as grade 5 and one "R" and one "U" logo.
There, I can now put the '65 stuff away for another 15 years.Comment
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