Fuel Pump Rebuild Kits

[Michael M.]

I have a GM 6415748 fuel pump for my 68 427/390. The pump has been installed for probably 20 years. I am about to change the manifold and carburetor and I figure it's time for a rebuild. This is a screw type fuel pump and is rebuildable. Does GM make rebuild kits for these pumps? Should I just go to my FLAPS? I saw a website called "Classic Preservation" located in upstate NY that sells carburetor rebuild kits and fuel pump rebuild kits and performs fuel pump restoration. This guy, Hal, claims to sell rebuild kits with materials that are compatible with today's ethanol fuels.

Can anyone help here? I really don't know what to do. I could buy a whole new pump, but I suspect my pump is better built than the one I'll buy new today. Thanks.

[Jim T.]

Re: Fuel Pump Rebuild Kits

My 68 built in FEB 1968 did not come with a screw type fuel pump that can be rebuilt. It is a 68 327/350 L79, guess the 427's in 68 had the older style pumps.

[Michael M.]

Re: Fuel Pump Rebuild Kits

No, Jim, this pump is NOT original. The originals were crimped. This pump is listed in the Chevy Power Catalog from many years ago for big blocks. It's a high capacity pump and is the rebuildable screw-type.

[Larry M.]

Re: Fuel Pump Rebuild Kits

No, Jim, this pump is NOT original. The originals were crimped. This pump is listed in the Chevy Power Catalog from many years ago for big blocks. It's a high capacity pump and is the rebuildable screw-type.

Then I would rebuild it.

Larry

[Michael M.]

Re: Fuel Pump Rebuild Kits

Yes, it was my intention to rebuild, but what is the best source for the fuel pump rebuild kit? Does GM sell them? Should I go to my FLAPS? Should I go to this guy Hal, who has the Classic Preservation website? Thanks for any replies.

[David L.]

Re: Fuel Pump Rebuild Kits

Is the number "40170" stamped on the edge of the flange? There may also 2 letters (date code) stamped after this number.
GM # 6415748 = AC # 40170

GM # 6415748 is still available from GM but in the non-rebuildable form for $96.88 list.

GM # 6415748 is listed the 1971 Chevrolet Parts Catalog but not in the normal 3.900 group. It is listed on a special page (Rev. 2/71) for High Perf. parts for 396 & 427 engines.

The 1968 AIM list fuel pump # 6440659 for the L36 engine.
6440659 = AC # 40659 = GM # 6417338 (over the counter), non-rebuildable type

Dave

[Joe L.]

Re: Fuel Pump Rebuild Kits

Is the number "40170" stamped on the edge of the flange? There may also 2 letters (date code) stamped after this number.
GM # 6415748 = AC # 40170

GM # 6415748 is still available from GM but in the non-rebuildable form for $96.88 list.



GM # 6415748 is listed the 1971 Chevrolet Parts Catalog but not in the normal 3.900 group. It is listed on a special page (Rev. 2/71) for High Perf. parts for 396 & 427 engines.

The 1968 AIM list fuel pump # 6440659 for the L36 engine.
6440659 = AC # 40659 = GM # 6417338 (over the counter), non-rebuildable type

Dave

Dave------


The GM #6415748 is now discontinued. However, there is a screw-type pump available from GM for big blocks. It's GM #12355614.

[Larry M.]

Re: Fuel Pump Rebuild Kits

Yes, it was my intention to rebuild, but what is the best source for the fuel pump rebuild kit? Does GM sell them? Should I go to my FLAPS? Should I go to this guy Hal, who has the Classic Preservation website? Thanks for any replies.

I would simply go to NAPA to get the rebuild kit. If they do not have one, then I would try other sources. All of the kits now days should be resistant/tolerant to 10% ethanol laced gasoline.

Larry

[David L.]

Re: Fuel Pump Rebuild Kits

Jim,

There is a NOS 6415748 (AC 40170) fuel pump (original rebuildable type) currently on Ebay (not mine, see link below) if you don't want to rebuild your pump and have a really FAT WALLET.

As far as I know the 6415748 pump was only a service pump and never installed on the production line.

BTW, the 40170 pump looks very similar to the 40394 pump (66 Nova SHP 327, L79) except is does not appear to have the two gussets. The angle between the inlet and the outlet appears to be 108 degrees (3 screws between) just like the 40394 pump.

Dave

http://www.ebay.com/itm/67-68-69-CAMARO-CORVETTE-L-88-ZL-1-FUEL-PUMP-A-C-40170-NOS-6415748-/121038468761?pt=Vintage_Car_Truck_Parts_Accessories&hash=item1c2e747699&vxp=mtr

[Michael M.]

Re: Fuel Pump Rebuild Kits

Thanks for the replies. I'll try NAPA first. We'll see what they have.

[Joe L.]

Re: Fuel Pump Rebuild Kits

Jim,

There is a NOS 6415748 (AC 40170) fuel pump (original rebuildable type) currently on Ebay (not mine, see link below) if you don't want to rebuild your pump and have a really FAT WALLET.

As far as I know the 6415748 pump was only a service pump and never installed on the production line.

BTW, the 40170 pump looks very similar to the 40394 pump (66 Nova SHP 327, L79) except is does not appear to have the two gussets. The angle between the inlet and the outlet appears to be 108 degrees (3 screws between) just like the 40394 pump.

Dave

http://www.ebay.com/itm/67-68-69-CAM...747699&vxp=mtr

Dave-----

I believe you are correct; the GM #6415748 aka AC 40170 was available only as a SERVICE fuel pump and not used in PRODUCTION. I don't think that a screw-type, rebuildable pump was ever used in PRODUCTION for any Mark IV big block in a Corvette or other passenger car. The eBay item description says the 6415748 was used for L-88 and ZL-1 but I have absolutely no information that it was so-used. Such a pump may be PICTURED in ZL-1 engine photos but I don't think it was ever actually used on a PRODUCTION engine. This is just like photos that show ZL-1's and L-88's with aluminum water pumps. Such pumps were available from GM and may very well have been used on SERVICE engines but they were not used on PRODUCTION engines.

Incidentally, 1969 L-88 and ZL-1 may have used a fuel pump of AC type 40718. If so, I believe this was a "sealed" type pump. As far as I can tell, it was
never available in SERVICE. For SERVICE GM always cataloged the type 40482 which is the same pump used for most other 67-69 Corvette 427's.

Also, I have no information that the GM #6415748 was ever converted from a screw-type, rebuildable pump to a sealed-type, non-rebuildable pump. For one thing, it would be, to say the least, EXTREMELY unusual for this kind of a configuration change to occur without a change in either GM part number or AC type number. Any photos that show it as a sealed type pump may be "generic" type photos.

[Joe L.]

Re: Fuel Pump Rebuild Kits

Thanks for the replies. I'll try NAPA first. We'll see what they have.

Michael-----


Here's the problem: the GM #6415748, aka AC type 40170, was never a PRODUCTION type pump. In general, GM never offered component parts of assemblies which were non-PRODUCTION (unless they were the same as the component parts of PRODUCTION assemblies). This was not always true but is true, in general. So, since the 6415748 was not a PRODUCTION fuel pump, GM probably never offered internal parts for it unless those parts were the same as PRODUCTION-utilized fuel pumps (i.e. the screw-type, rebuildable pumps used for most small blocks prior to 1967). However, I do not know, for sure, if the internal parts of the small block, rebuildable pumps are the same as the 6415748. I know, for sure, that the cam follower arm is different. Whether this results in other internal differences, I do not know.

Another problem: if you go to NAPA or any other auto parts store, they will probably only be able to look up a part number by APPLICATION. Since the 6415748 had no PRODUCTION applications, I think they will have a lot of trouble finding a part number for a correct kit for it. If they can look up kit part number by fuel pump part number, that will solve the problem, but I highly doubt they have this capability. Nevertheless, it's worth a try as it's the simplest solution (always go with the simplest first). Let us know how it works out, though.

[David L.]

Re: Fuel Pump Rebuild Kits

Joe,

Currently on Ebay (not mine) there is a non-buildable type 6415748 (AC # 40170) pump for $39.00 "buy it now". It looks like the real deal in a modern AC Delco box and not a generic photo.

Dave

http://www.ebay.com/itm/1966-CHEVELLE-FUEL-PUMP-AC-DELCO-NEW-GM-NOS-/320686657925?hash=item4aaa6a1185&item=320686657925&pt=Vintage_Car_Truck_Parts_Accessories&vxp=mtr

[Joe L.]

Re: Fuel Pump Rebuild Kits

Joe,

Currently on Ebay (not mine) there is a non-buildable type 6415748 (AC # 40170) pump for $39.00 "buy it now". It looks like the real deal in a modern AC Delco box and not a generic photo.

Dave

http://www.ebay.com/itm/1966-CHEVELL...sories&vxp=mtr

Dave------

This has got to be the most dramatic change in a part's configuration without a change in part number that I've ever seen.

Also, to make it more confusing, doing a bit more research I find that the AC 40170 was apparently applicable to 1965 full size passenger cars with 396 and, possibly, some 1966 Chevelle SS 396. I can't confirm that this was the pump originally used in PRODUCTION, though. According to other information I have, a GM #6415961, aka AC 40193, was used for those applications. The latter is definitely a sealed type pump. I wonder if these AC pumps boxed under GM #6415748 and stamped 40170 aren't really GM #6415961, aka AC type 40193?

[David L.]

Re: Fuel Pump Rebuild Kits

Dave------

This has got to be the most dramatic change in a part's configuration without a change in part number that I've ever seen.

Also, to make it more confusing, doing a bit more research I find that the AC 40170 was apparently applicable to 1965 full size passenger cars with 396 and, possibly, some 1966 Chevelle SS 396. I can't confirm that this was the pump originally used in PRODUCTION, though. According to other information I have, a GM #6415961, aka AC 40193, was used for those applications. The latter is definitely a sealed type pump. I wonder if these AC pumps boxed under GM #6415748 and stamped 40170 aren't really GM #6415962, aka AC type 40193?

Joe,

AC # 40193 = GM # 6415961 as per AC Delco fuel pump conversion chart dated 1987

The 6440193 (AC 40193) pump is listed for the following as per the AIM's:
65-66 Chevrolet 396 (L36 & L78)
66 Chevelle 396 (L36, L34 & L78)

The 6440248 (AC 40248) pump is listed for the following as per the AIM's:
65 Chevelle 396 (L37)
65 Corvette 396 (L78)
I believe that AC # 40248 = GM # 6415962

6440248 was replaced with 6440193 theoretically on 8/7/65 as per 66 Chevelle AIM.

The 6440366 (AC 40366) pump is listed for the following as per the 66 Corvette AIM:
66 Corvette 427 (L36 & L72)
AC # 40366 = GM # 6416245

GM # 6415962 was replaced with GM # 6416245 in Aug. 1967 as per Chev. Parts History.

Dave