396 fuel pump
I have the original fuel pump for my 396 . The last time it was started was in about 1980 and ran ok . Is there anyone who rebuilds the crimped 40366 pumps ? Is there a way to bench test mine ? If not who makes a good reproduction ?
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Re: 396 fuel pump
If you talk with Brian at Volunteer, Vette, he has somebody rebuild them. I just had two 40709's rebuilt, they look great. They have done several for me.
Last time I posted this info, I was taken to task for spreading mis-information. But, they are being done, and I have had good luck with them
Gary B -
Re: 396 fuel pump
Bill,
Can you move the pump rocker arm in/out full motion and feel suction. If so, I would put it on the engine and try it but make sure to carry a fire extinguisher in the car. The crimp may look wet until the rubber diaphragm swells again because it's dried out but it may be fine.
The person I was told that can overhaul these crimped pumps is Fred Ballard, Canyon Country, CA 661-251-2362. This is second hand information and I have not spoken to this man FWIW.Comment
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Re: 396 fuel pump
Bill,
Is the stamped number on the pump just "40366" or is there additional letters (date code) on the stamping as well?
DaveComment
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Re: 396 fuel pump
Dave it looks like it is just 40366 stamped on the lower flange . It still has a lot of sludge on it . when I clean it I will let you know if its different .Comment
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Re: 396 fuel pump
David, The date code, which i believe is two letters if i am not mistaken, how is that deciphered? Such as HG.............Comment
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Re: 396 fuel pump
Rick,
IMO the "HG" = Aug. 1967. I have a lot of evidence but there are still nonbelievers (see link below). The 1964 and earlier AC fuel pumps did not have a date code in the stamping on the flange. The "early" 5-digit stamped crimped type AC fuel pumps also did not have the 2-letter date code.
Dave
https://www.forums.ncrs.org/showthre...380#post540380Comment
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Re: 396 fuel pump
Hi Dave . Mine is just 40366 it is the original from 65 BB # 17346. I will e mail a photo later tonight .Comment
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Re: 396 fuel pump
Bill,
On your "40366" pump is there a "plain" hole above the threaded outlet with a casting year and radial hash marks? I have never had an assembly line 40366 pump. The rebuildable 4657 AC pumps have a "plain" hole above the threaded outlet that has a 2-digit casting year along with 1 to 12 radial hash marks which designate the month. You may need a magnifying glass and some Q-tips for cleaning purposes.
DaveComment
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Re: 396 fuel pump
I'll need to clean it better . answer wed.Comment
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Re: 396 fuel pump
The 396 used an early and a late pump . The 40366 was the second design . my car was build late May # 17346Comment
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Re: 396 fuel pump
The 1965 AIM lists 6440248 as the fuel pump for the L78 (396). My 1965 Chevrolet Parts Catalog (May 1965) lists GM # 6415962 as the fuel pump part number for the 1965 Corvette (396).
AC 40248 = GM 6415962.
The 1966 AIM lists 6440366 as the fuel pump for the L36 & L72 (427). My 1966 Chevrolet Parts Catalog (Oct. 1965) lists GM # 6416245 as the 1966 Corvette (427)(exc. Sp./H/Per.) fuel pump part number and GM # 6415962 as the 1965 Corvette (396) fuel pump.
AC 40366 = 6416245
According to Chevrolet Parts History (for service parts, not assembly line parts) GM # 6415962 was replaced with GM # 6416245 in Aug. 1967.
I have no idea when the exact change took place on the assembly line where the 40248 pump was replaced with the 40366 pump but hearsay tells me it was about May 1965. The 396 first appeared sometime in the middle of the 1965 production (possibly March 1965).
DaveComment
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