66 fuel line: pump to carb

[David L.]

Re: 66 fuel line: pump to carb

Michael,

The 1966 AIM (UPC 6, sheet C1) lists 3882838 as the fuel pump to carb fuel line but the revision record shows this fuel line as GM # 3892693 prior to 3/28/66.

The 1967 AIM ( UPC 6, sheet C1) lists 3892693 as the fuel pump to carb fuel line.

Was the 3892693 fuel line plain and the 3882838 fuel line chrome?

I could not find any photos of a 300 HP engine fuel line in Noland Adam's 63-67 restoration book.

There is no 1967 300 HP fuel line listed in my 1967, 1968, and 1969 Chevrolet parts catalogs.

Dave

[Michael H.]

Re: 66 fuel line: pump to carb

Michael,

The 1966 AIM (UPC 6, sheet C1) lists 3882838 as the fuel pump to carb fuel line but the revision record shows this fuel line as GM # 3892693 prior to 3/28/66.

The 1967 AIM ( UPC 6, sheet C1) lists 3892693 as the fuel pump to carb fuel line.

Was the 3892693 fuel line plain and the 3882838 fuel line chrome?

I could not find any photos of a 300 HP engine fuel line in Noland Adam's 63-67 restoration book.

There is no 1967 300 HP fuel line listed in my 1967, 1968, and 1969 Chevrolet parts catalogs.

Dave

David

My guess on the part number change (3892693/3882838) had to do with the fuel pump change at some point during the 66 model year. (if it actually changed) The screw together style pump may have required a different length fuel line than the pressed together design.

As you mention, for 67 the fuel line part number went back to the 3892693 and the fuel pump for all of 67 was the pressed together design. The 693 pipe and the later fuel pump would be used together.

I also looked in the Adams book and found no pic's of 66 or 67 fuel lines.

[Timothy B.]

Re: 66 fuel line: pump to carb

Michael,


I have the original fuel pipe (pump to carb) that came from my 1967 300hp engine and I can tell you for a fact it's not chrome.

[Peter L.]

Re: 66 fuel line: pump to carb

Michael - The 66 Corvette AIM (UPC 6 SHEET C1) I have shows the following in the DRAWING:

1 3882838 PIPE ASM - *(3 LETTERS I CANNOT READ) but based on the 67 AIM the word is GAS
4 5594657 FUEL PUMP

in the REVISION RECORD:
3-28-66 8 WAS 3892693 PIPE
9 WAS 6440433 PUMP
So, based on the 66 AIM was the 6440433 PUMP (the pressed together fuel pump design) the earlier FUEL PUMP & then the 5594657 FUEL PUMP used on later PRODUCTION 1966 Base Motor Engines? The 66 TIM&JG indicates that the 5594657 was used early in the model year & that the 6440433 fuel pump, crimped assembly style was introduced during the model year.

To add to the confusion the 67 Corvette AIM shows the following in the DRAWING:

1 3892693 - PIPE ASM.-GAS
4 6440433 - FUEL PUMP

The REVISION RECORD lists the following:
10-27-66 3 FUEL PUMP DWR. REV.


Pete

[Timothy B.]

Re: 66 fuel line: pump to carb

Pete, I don't want to add to the confusion but the revision record in the 66 AIM can't be correct. No way they could have used a pressed pump then went back to the screw together pump.

[Page C.]

Re: 66 fuel line: pump to carb

I have an NOS 3882837 with the old GM IBM style picking ticket still attached. This pipe asm. is chrome as well as the fittings.

[Peter L.]

Re: 66 fuel line: pump to carb

Tim - Exactly that's why I indicated that the information is confusing. Pete

[Gary B.]

Re: 66 fuel line: pump to carb

I have an NOS 3882837 with the old GM IBM style picking ticket still attached. This pipe asm. is chrome as well as the fittings.

I don't think there's any debate about the 3882837 line for the 350 HP engine being chrome.

Gary

[Michael H.]

Re: 66 fuel line: pump to carb

Michael,


I have the original fuel pipe (pump to carb) that came from my 1967 300hp engine and I can tell you for a fact it's not chrome.

Thanks Tim. That's exactly what I was looking for. That would be the 3892693 plain fuel line used all year in 67.

Now, if someone has a 66 300 HP with an original fuel line, we can confirm that no chrome was used for that part.

[Michael H.]

Re: 66 fuel line: pump to carb

Pete, I don't want to add to the confusion but the revision record in the 66 AIM can't be correct. No way they could have used a pressed pump then went back to the screw together pump.

Tim

I think that's exactly what happened. Start of production used the old 4657 screw together pump, then it was replaced by the crimped cover 6440433 pump, which was replaced again by the original 4657.

I don't know why things happened that way but there is a clue. The following is from a GM release around July-August of 1965, a few months before production began on the new 66 model.
It discusses the new crimped cover for all new big blocks for 1966, then goes on to say...

"While all other fuel pumps are carry-over, (from 65) it is expected that as soon as production volume will permit, the stamped type of pump will be used on all Chevrolet vehicles"

So we know it was scheduled for some point in 66 production. We don't know when though.

I suspect the stamped pump did enter production but, for reasons unknown, it was removed and the original 4657 replaced it.

The fuel pump change also required a change for the fuel line. Looking at the 66 AIM shows that both the fuel pump and the fuel line were changed on the same date, 28 March 66.

[Michael H.]

Re: 66 fuel line: pump to carb

Michael - The 66 Corvette AIM (UPC 6 SHEET C1) I have shows the following in the DRAWING:

1 3882838 PIPE ASM - *(3 LETTERS I CANNOT READ) but based on the 67 AIM the word is GAS
4 5594657 FUEL PUMP

in the REVISION RECORD:
3-28-66 8 WAS 3892693 PIPE
9 WAS 6440433 PUMP
So, based on the 66 AIM was the 6440433 PUMP (the pressed together fuel pump design) the earlier FUEL PUMP & then the 5594657 FUEL PUMP used on later PRODUCTION 1966 Base Motor Engines? The 66 TIM&JG indicates that the 5594657 was used early in the model year & that the 6440433 fuel pump, crimped assembly style was introduced during the model year.

To add to the confusion the 67 Corvette AIM shows the following in the DRAWING:

1 3892693 - PIPE ASM.-GAS
4 6440433 - FUEL PUMP

The REVISION RECORD lists the following:
10-27-66 3 FUEL PUMP DWR. REV.


Pete

Thanks Peter

I agree, the 5594657 pump and 3882838 pipe were a set and had to be used together. This is the screw together pump.

The 6440433 pump and 3892693 pipe, released later were also a set and had to be used together.

When the fuel pump changed in production, the fuel line also changed on the same date. I think that proves that there were two different plain unplated fuel lines and two different fuel pumps used for 300 HP in 66.

Confusing for the 66 model but by the time the 67 model was released, the new 6440433 crimped pump was finally available in quantity so it was used all year along with it's matching 3892693 fuel line.

[David L.]

Re: 66 fuel line: pump to carb

Tim

The following is from a GM release around July-August of 1965, a few months before production began on the new 66 model.
It discusses the new crimped cover for all new big blocks for 1966, then goes on to say...

"While all other fuel pumps are carry-over, (from 65) it is expected that as soon as production volume will permit, the stamped type of pump will be used on all Chevrolet vehicles"

The September-October 1965 issue of Chevrolet Service News has the following paragraph about 1966 fuel pumps:

"Stamped type fuel pumps (Fig. 11) will be used on the 1966 292 cu. in., 366 cu. in., 396 cu. in. and 427 cu. in. engines, as well as on all vehicles equipped with the Air Injection Reactor System. This type of pump incorporates a sheet metal cover which is crimped over the pump body. Repairs can not be made. Complete replacement is only service possible."

Figure 11 is of a stamped type fuel pump.

Dave

[Rob M.]

Re: 66 fuel line: pump to carb

Michael,

Thanks for all the information. This is way more than I intended when I originally posted the question.

I did do a little research related to the issue and thought I would share. First, the most current edition of the 66 TIM and JG states that ALL fuel lines were chrome for the small block. Secondly, I emailed a member with a bowtie 66 300 horse that is fairly close to my car's production. He states that his original fuel line is chrome.

Cheers

[Michael H.]

Re: 66 fuel line: pump to carb

I just looked at a basically unrestored 66 with it's original 300 HP engine. The fuel pump to carburetor fuel line is NOT chrome plated.

I think there's more to learn on this issue.

Where are all the 66 owners????? There must be more out there with original fuel lines. Are all the 66's restored?

[Rob M.]

Re: 66 fuel line: pump to carb

Good question. Where are they?

Do you remember the approximate vin of the car you looked at? My friends Bowtie car is an early March build and my car is the first week of May. My line is not original (obviously) and there just aren't that many who's owners frequent the TDB.

I might send an email to the team lead and see what he has to say.