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Author Topic: 396 350hp fuel pump  (Read 483 times)
DeanZ10
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« on: March 10, 2014, 09:35:39 AM »

I am not finding a lot of info on the correct part number for this application. Could someone help?
I have seen claims bolted as original, crimped as original, weep holes, no weep holes, some will have dates, some will not.... on and on.

Thanks for any information/clarification

Dean
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SgtHawkUSMC
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« Reply #1 on: March 10, 2014, 10:20:35 AM »

Here is a pic of mine. This one is date coded 1973, which means it was obviously replaced at some point, but it's the correct pump and number. Mine is an L34 like yours. Good luck.





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Hawk
69 SS396 L34 M21 BS Hugger Orange
DeanZ10
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« Reply #2 on: March 10, 2014, 11:23:49 AM »

Thanks!   Couple more questions..
How does the date decode? 343=Julian date day of year? K=1973?
Do you know what the 69 code would be?
Also, can anyone tell me if the 69 model was bolted or crimped?

Again, Thank you!
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SgtHawkUSMC
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« Reply #3 on: March 10, 2014, 02:14:49 PM »

You're welcome. Hope this helps. From more reading from the same poster, it looks like "K" might actually be 1971. Mine was a late 69 build, so the pump I have is more than likely a warranty replacement.

From DCL70SS on CRG:
"The first letter is the month, A=Jan, "B"=Feb. ...........................L=Dec. (the letter "I" was used).
The second letter is the year, E=1965, F=1966, G=1967, H=1969.
NOTE: The AC pumps made in 1964 and prior do not have the 2 letter. I have an AC pump stamped only "4657" from a 1964.
Sometime in the early 1970's the date code changed to 3 numbers (the day of the year) and one letter (the year)."

More info from what appears to be the same user that says K is 71

http://www.nastyz28.com/forum/showthread.php?t=207770
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Hawk
69 SS396 L34 M21 BS Hugger Orange
ko-lek-tor
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« Reply #4 on: March 10, 2014, 02:20:49 PM »

Thanks!   Couple more questions..
How does the date decode? 343=Julian date day of year? K=1973?
Do you know what the 69 code would be?
Also, can anyone tell me if the 69 model was bolted or crimped?

Again, Thank you!
To answer your question about bolted or crimped. The original pump look just like the picture provided by SgtHawk=crimped. Most GM pumps are crimped, I believe the ZL1 was bolted together and some early  pumps pre-67 and maybe some large truck comercial applications. I am sure someone will tell me different, but forgive my memory on this. The main point is the pump you want will be crimped.
Here is a thread of use and do a search "fuel pump date" and there are other posts. http://www.camaros.org/forum/index.php?topic=11520.0

A side note: SgtHawk I think your pump is for H.P. application, i.e. L78. L34=40568
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Putting you First...Keeps me First. Talent on loan from God. Helping the hobbyist and exposing the fraud
1969 SS/RS 396 coupe Hugger Orange X22 712 bought in 79
1969 SS 350 coupe LeMans Blue 713 bought in 79
1969 307 4spd. coupe Daytona Yellow 711 bought in 85
mickeystoys69RSSS
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« Reply #5 on: March 10, 2014, 05:32:53 PM »

I will try and get the information from mine when I get at chance. It is an original L34.
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ko-lek-tor
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« Reply #6 on: March 10, 2014, 06:29:17 PM »

Dating pumps goes like this: 1965 rebuild-able pumps have a part number followed by 2 letters. 1st letter is month,2nd is year.An example would be : 4657KE (Nov. 1965) 1965 ended in E, 66=F
Crimped pumps were phased in around mid-year (June)1966. At this time the 2 letter dating preceded part#(at beginning). An example would be: GF40433 (July 1966) for 67 model year car. 2nd letter is year where: F=1966,G=67',H=68',I=69',J=70'. The months, 1st letter, are A-L=Jan-Dec. Starting in 1971 a new Julian alpha/numeric dating was used. An example :219K40956 (219th day of 1971)This would be for a 1972 car as this is late in the year, but shows that dates follow calendar and not model year. K=1971 remembering this includes 1972 models up to Dec 1971. L=72 and so-forth. Hawks pump is: 343K40727. The 343 is 343rd day of K=1971 (Dec  1971),which is late in year and considered a 1972 pump by model year production.
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Putting you First...Keeps me First. Talent on loan from God. Helping the hobbyist and exposing the fraud
1969 SS/RS 396 coupe Hugger Orange X22 712 bought in 79
1969 SS 350 coupe LeMans Blue 713 bought in 79
1969 307 4spd. coupe Daytona Yellow 711 bought in 85
paceme
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« Reply #7 on: March 10, 2014, 06:36:15 PM »

I am not finding a lot of info on the correct part number for this application. Could someone help?
I have seen claims bolted as original, crimped as original, weep holes, no weep holes, some will have dates, some will not.... on and on.

Thanks for any information/clarification

Dean


My 69 L34 survivor has its original dated pump. Goathill rebuilt it for me years ago 40568.
   
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Steve Shauger
Vintage Certification™ Program, Providing Recognition And Status To Unrestored Vehicles. Website www.vintagecertification.com
SgtHawkUSMC
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« Reply #8 on: March 11, 2014, 07:18:19 AM »

A side note: SgtHawk I think your pump is for H.P. application, i.e. L78. L34=40568
Thanks for that. I had no idea. It goes to show you, anything can happen in 40+ years. I'm not surprised, fuel pumps fail... I'm sure mine was replaced with what was available at the time. Any idea if the fuel pressure is any different between the two? Maybe I SHOULD be thinking about what we talked about in the PM... hmmm.
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Hawk
69 SS396 L34 M21 BS Hugger Orange
paceme
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« Reply #9 on: March 11, 2014, 11:55:35 AM »

A side note: SgtHawk I think your pump is for H.P. application, i.e. L78. L34=40568
Thanks for that. I had no idea. It goes to show you, anything can happen in 40+ years. I'm not surprised, fuel pumps fail... I'm sure mine was replaced with what was available at the time. Any idea if the fuel pressure is any different between the two? Maybe I SHOULD be thinking about what we talked about in the PM... hmmm.

I believe the difference is probably the pump volume/flow rate and not pressure. I think the stroke on the pump varies slightly. Too much pressure causes needle seat leakage and creates problems.
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Steve Shauger
Vintage Certification™ Program, Providing Recognition And Status To Unrestored Vehicles. Website www.vintagecertification.com
SgtHawkUSMC
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« Reply #10 on: March 11, 2014, 01:59:58 PM »

Take a look at the applications for the 40727 (my pump). I've never noticed the note in the listing that shows specifically w/o the return line like Classic Industries listing( see below). I always saw the 70 L34 and never looked any deeper and figured mine was right. Ground Up is different and so are a bunch of others. My motor is a CJF which means its actually a 402 and would be considered a 1970 motor even though it's my born with 396 engine.

Classic Industries:
Applications:

•1969 396/375hp (L-78)
•1970 396/350hp (L34) w/o return line
•1970 396/375hp (L-78) after Feb 70, w/o return line

Ground Up's Listing:

Correct for 1967 Chevy 427, Chevrolet 396/350HP, 1968 Chevrolet 396/375HP, 1968 Chevrolet 427, 1969 Chevrolet 396, 1969 Chevrolet 427, 1970 Chevrolet 396 or 454 with Holley carb,

 I feel like I'm hijacking, so I'll leave it at that. Sorry for the bad info Dean...
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Hawk
69 SS396 L34 M21 BS Hugger Orange
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