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can anyone tell me if this is the correct fuel pump for an early 1968 327/300 base engine car. serial number is under 1200. car is 4 speed if it matters.
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Re: AC Delco fuel pump. AC# 40018 GM#6415616
geno-----
No, it's not even close. The AC 40018, GM #6415616 is a "screw-type" fuel pump which is applicable to many 1958-66 Chevrolet Corvette and passenger car applications. It was never used on a 68 small block, though.
All 1968 Corvette small blocks were originally fitted with an AC type 40658 fuel pump of GM #6417337. This is a crimped-style fuel pump. It is still available through Delco, although it has been discontinued through the GM parts system for over 25 years. The currently supplied version lacks the "AC" logo on the cast upper body of the pump.In Appreciation of John Hinckley -
Re: AC Delco fuel pump. AC# 40018 GM#6415616
When I had my 66, I was looking for a proper fuel pump and, if memory serves me right, this is the correct fuel pump for a 66 327/350. I also remember that the proper fuel pump was difficult to find and fairly expensive. Sell it in the Restorer.
GaryComment
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Re: AC Delco fuel pump. AC# 40018 GM#6415616
I have two 40018 fuel pumps. They both have AC logos. Neither is a "screw type". Both are "crimped"? types. The first was on my 1965 327/300 when I bought it with 65K miles in 1988. The second was purchased from local car shop in 1990. Old box , faded colors AC. Identical to the one on the car. Paid $20. Figured I had an original. Nope, I now find out I need a "screw" type. 5594657. Point is that the original factory 40018 could have been a "screw" type but the service replacement 40018 from AC became a "crimp" type.
Now if anyone should happen to have a "4657" I need one.
What are the odds on finding a "4657" at the junk yard on a full size car with the 327/300 circa 1965. OR a Chevelle or Camaro of the era? Were they common or rare and seen only on Corvettes?Comment
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Re: AC Delco fuel pump. AC# 40018 GM#6415616
thank youComment
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Re: AC Delco fuel pump. AC# 40018 GM#6415616
Jack,
The 4657 is fairly popular. I picked one up from a friend for my 66 327/300 hp and rebuilt it. Rebuild kit is very common. I recently saw two pumps at a flea market for $50 ea. Should have bought a spare.
Dave KitchComment
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Re: AC Delco fuel pump. AC# 40018 GM#6415616
Jack----
First off, I doubt that the method of construction of the 40018 would have changed over the years. If a change from a screw-type to a crimped type had occurred for SERVICE, I would expect that a part number change would have been the route. I suppose it's possible, but I've never seen such a change occur. Second, you mention that you have one in an old box. That would indicate that if a change occurred, it must have occurred a long time ago.
As far as I know, no crimped type pump was used on a Corvette small block prior to 1966. Crimped type pumps were the only style that was ever used on Corvette big blocks, though, starting with 1965. The 40018, GM #6415616 is applicable to certain 58-65 Corvette and passenger cars with small block.I just don't think that this is a crimped style pump.
Could there be a confusion of terms here relative to what is meant by "screw-type" and "crimped type". I believe that the 40018 is a "short screw" type pump. In this design, 10 SHORT screws retain the main body of the pump to upper cast housing (with the "AC" logo, if present) which attaches to the block. The screws are installed from the bottom up, so no screw HEADS are seen when looking down at the pump. The base plate of the pump, however, is not attached by the screws.
The "long screw" type pumps (which the 40018 is NOT) use much longer, through screws to retain both the base plate and the center body to the upper casting. The center section of these screws can be seen exposed around the perimeter of the pump.In Appreciation of John HinckleyComment
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