Fuel Injection Fuel Pump

[Roger D.]

I have am early build 64 which has a 63 injection unit. Actually I am cloning my 64 to a fuel injected mode. With that said, I need a period correct pump. I know originals are rare and expensive but I don't know it's part number nor what it looks like. I would prefer to have one that looks right I guess. I know this may be a rub to some but I had a fuelie car in 65 and just want to have one more go of it at 72. Any pictures would help or numbers.

Thanks for any help

[Jim L.]

Re: Fuel Injection Fuel Pump

Roger, is it the engine-mounted pump you are seeking? Your FI unit has an internal fuel pump but that's not what you are asking about, is it?

[Don H.]

Re: Fuel Injection Fuel Pump

if you are referring to the fuel pump on the SHP engine, the Delco 40083 was specified. The old originals are available from used parts vendors, David Sokolowski in South Gate CAL for instance. See his Driveline ads. Here is what one version of the original looks like. There is a second original that has a cast metal bottom cover. These are easily rebuilt. Modern versions are readily available but they lack many detail characteristics of the OEM version and will take deducts in judging.

[Dan H.]

Re: Fuel Injection Fuel Pump

Roger, stay with the 64 style pump because the pump to filter fuel line will fit, but not to a 63 style pump. There are service replacements for the one Don shows, much cheaper but missing details of original.
Dan

[Roger D.]

Re: Fuel Injection Fuel Pump

Right Jim, looking for the engine block pump.

[Roger D.]

Re: Fuel Injection Fuel Pump

Dan my injection unit is 63 so maybe the 63 pump may work with the fuel supply line?

[Don H.]

Re: Fuel Injection Fuel Pump

Roger,
the 63 FI fuel pump was Delco 4657. You can look up the 4657 and the 40083 on any of the vendor's website.

[Mike M.]

Re: Fuel Injection Fuel Pump

64-65 solid lifter owners take note of don's photo. its an original 40083 as evidenced by the THREE gussets cast into the top of the 40083. we rarely come across the 3 gusset critters when judging the 64-65 solid lifter cars. mike

[Dan H.]

Re: Fuel Injection Fuel Pump

Roger, what I recall is that the length of the pump to filter line is different due to the fuel pump outlet locations and fittings. The lines that vendors sell are the later 64/65 lines as are the NOS ones. John DeGregory would be familiar with the differences.
Dan

[Roger D.]

Re: Fuel Injection Fuel Pump

That was my next question. What fuel line from the pump since it is a 63 injection unit and probably the 0083 pump. Paragon?

[Bob R.]

Re: Fuel Injection Fuel Pump

63 and 64 FI units locate the fuel filter in the same location on the FI unit so the only difference in the length of the fuel line would be because of the fuel pump. If you use a 64 fuel pump the current reproduction fuel lines will probably fit fine if you use a 63 fuel pump the reproduction line will be off.

[Larry M.]

Re: Fuel Injection Fuel Pump

The correct number for the 64/5/6 HiPo pump is 40083. I've never seen a documented 66 take off which was used on the 350HP but would guess it to be the same as 64/5 examples I have seen. If you search this forum you'll see pictures posted by Alan Drake of an original assembly line 64 and other good information.

If there are two letters after the 40083 this is a date code. There are forum postings which suggest how to decode this. I've never seen this code on an assembly line configuration example but they were on service replacement which were made until the early 70s and maybe longer. I believe the other key difference (only difference other than the letter date code and internal small casting date codes) is that the service pumps lack two bosses at 180 degrees between the screw heads in the 10 screw circle. On a service pump the words Made In USA are in three cavities between screw heads. For assembly line pumps one of the two bosses covers the "In" so it just says Made USA.

There were service pumps without the date and with the bosses just like the assembly line pumps. I have one new in the box.

Richard Fortier (Fastener King) has an assembly line example for sale on ebay for $750. In his pics you can see the two bosses and the Made USA. You can also see a small "S" on the screw heads which is correct for both assembly and service pumps as well as other AC pumps of the era. What you don't see on Richard's rebbuild is the correct crimp and washer on the hinge pin. If you could see the other end you would not see the correct "+" symbol on the non crimp end of the hinge pin. Nor do you see the thick edge with cotton fibers of an original main diaphram or the the wavy white or yellow lines in the lower gasket. Goat Hill Classics has another assembly line original on ebay for $420. It is like Richard's but has the cast bottom cover which I believe is also correct either for early cars or a varying feature over production runs. I bought an unrebuilt assembly pump with a die cast bottom and others with sheetmetal.

Don's pics are of a service unit I think as there is a letter date code and I don't see the extra bosses(although a better pic might show them). But this pump appears un-rebuilt as it has the correct crimp/washer, diaphram, and gasket. If this pump has the extra bosses I'd love to see a pic which shows them. I'd bet it has the "+" on the other end of the pin.

These pumps can be rebuilt without removing the original pin or it can be removed and reused although the recrimp is generally visible.

All the 40083 examples I discuss include the TWO gussets at the base of the tower and the double step in the boss around the hinge pin.

The 375R FI unit was used in early 64 and I think with the 40083 but as suggested above I doubt the FI unit impacts the fuel line from pump to filter. From the filter to the fuel meter there may be a difference. The 4657 outlet is in the same location as the 40083 and should also not impact fuel lines. The fuel filter mounts to the right front stud bolt attaching the FI adapter to the block.

You can learn a lot by looking at the current pics on ebay of pumps and on the internet of FI units.....and on this forum.

[Don H.]

Re: Fuel Injection Fuel Pump

Larry- thanks for checking in. I always learn a lot from your insights and knowledge, especially of 64s.
Here are some more shots for you and others. There are two hash marks following the 40083. The extra bosses are not present. Most of the screws are embossed S. And the copper coated steel pivot pin has the + mark.

[Larry M.]

Re: Fuel Injection Fuel Pump

Looking at the FI unit above I doubt seriously there is any difference in the fuel lines from pump to fuel meter for 63-65. Looking up the parts at Long Island Corvette would verify this. These lines should be magnetic chrome plated steel which LIC sells so I'd recommend them for these parts. Their kit comes with several of the fittings also.

I suspect Mike counted three gussets to include the one at the top of the base plate. That one is on most fuel pumps including the 4657 above. The two at the base of the tower are an important difference of the 40083. The top casting of 40083 is magnesium and "feather" light. The bottom is also light but I don't think it is mag.....but it is not heavy potmetal. The two castings have a different appearance when clean and new.

Don, your two slashes are actually "L"s. They are upright and you can see the foot in a blown up view. From memory without looking it up I think the date is November 1971. I think EE is May 65 and you count up from there skipping "I".

The washer under the hinge pin crimp is fairly thick for it's small size. Don's very first pic shows this.

[Mike M.]

Re: Fuel Injection Fuel Pump

larry's excellent discussion of production vs service 40083 is right on. our 64 FI and a pair of 65 FI's all have their original 40083's and demonstrate larry's description. well done larry. mike