65 sb fuel pump?

[Dennis C.]

I purchased a fuel pump at carlisle with a part # that is for 63-5 "409".
The pump has AC embossed on the top and on the bottom cover and also has the cast rib support on the top.
My question is.Is this the physical style pump that would be on a 65 "327"300 and will it work on this eng?

[Joe L.]

Re: 65 sb fuel pump?

I purchased a fuel pump at carlisle with a part # that is for 63-5 "409".
The pump has AC embossed on the top and on the bottom cover and also has the cast rib support on the top.
My question is.Is this the physical style pump that would be on a 65 "327"300 and will it work on this eng?

Dennis------


Based upon your GENERAL description as well as the "63-65 409" application reference, the pump should be a GM #6415616, aka AC 40018. This pump is also the pump applicable to 1965 327/300 (L-75).

While it is not well known, fuel pumps for small blocks and Mark I big blocks (i.e. 348 and 409) are the same and/or interchangeable. This is NOT true for Mark IV big blocks (i.e. 396, 427, 454).

[Dennis C.]

Re: 65 sb fuel pump?

Joe,
That's great news to hear.I guess not too many know this.
My 1967 AC fp book list #6842 for 409 which is stamped on the pump flange .
The price I paid was that of a average old pump.

There is one other part # that maybe you could help me with.
I purchased a gm power brake check valve over 30 years ago at a swap meet but could never find its application.
The part# is 546326 gr.4.955.
Thanks,Dennis

[Joe L.]

Re: 65 sb fuel pump?

Joe,
That's great news to hear.I guess not too many know this.
My 1967 AC fp book list #6842 for 409 which is stamped on the pump flange .
The price I paid was that of a average old pump.

There is one other part # that maybe you could help me with.
I purchased a gm power brake check valve over 30 years ago at a swap meet but could never find its application.
The part# is 546326 gr.4.955.
Thanks,Dennis

Dennis------

Keep in mind that the pump in question is not the original pump for your application but it will SERVICE your application.

I can't find any reference to an AC 6842. In 1967, the original pump for the 1965 327 application was still available. It was AC type 4657, aka GM #5621665, so I don't know what the 6842 was.

The GM #546326 check valve is applicable to 1969 Chevrolet Nova and Camaro with power brakes and no other Chevrolet or GM applications I can find. It was discontinued from SERVICE in May, 1977 and replaced by GM #18000139. The latter was discontinued in April, 1978 and replaced by GM #18003614 which was discontinued in August, 1995 and replaced by GM #18021981 which remains available.

By the way, the GM #546326 was not a GM manufactured part. It was a Bendix-manufactured part and also known as their number 2508755.

[David L.]

Re: 65 sb fuel pump?

Dennis,

The 6842 AC pump is for 63-65 409 engines. My 1963, 1964, and 1965 Chevrolet Parts Catalogs list GM # 5621887 for the 63-65 Pass (409)(exc. RPO Z11).

About 20 years ago I sold a NOS GM 5621887 (AC 6842) fuel pump to someone in Australia. The pump was stamped "6842KE" where "KE" = November 1965 and the casting inside the hole near the outlet was "65".

GM # 5621887 was discontinued sometime between Jan. 1976 & Dec. 1981 as per GM Parts History.

My 1981 Chevrolet Parts Catalog (April 1981) lists GM # 6415616 (AC 40018) for 65-66 Pass. w/4BC (283,327,409). The AC "4657" (GM # 5621665) pump was the original fuel pump on 65-66 Chevrolets w/283 & 327 engines w/4BC as well as 63-66 Corvettes.

Dave

[Dennis C.]

Re: 65 sb fuel pump?

Joe and Dave,
Thanks for all the part application information.
I plan to rebuild this pump and use it on my 65 L-75.
Dennis

[Joe L.]

Re: 65 sb fuel pump?

Joe and Dave,
Thanks for all the part application information.
I plan to rebuild this pump and use it on my 65 L-75.
Dennis

Dennis-------


I'd definitely rebuild the pump and use a currently manufactured kit, not an NOS kit. As we all know, gasoline formulations of today aren't the same as the formulations of old. The elastomer components of the fuel pump internals have changed with the fuel. You need to have the current formulations if you're going to drive the car and you want it to be safe and reliable.

Also, you may need to re-clock the pump to have the outlet fitting in the correct position for the fuel lines. This just means that you rotate the top relative to the bottom of the screw-type pump.

[John D.]

Re: 65 sb fuel pump?

As Joe Lucia mentioned it's a whole new ball game today as far as rebuild kits for fuel pumps. I do not know if the Corvette repro catalogs have what you need or not. What you need is a kit that will with stand alcohol/ethanol. There are several companies around that sell these kits.
Try "Old Time Parts" sales@oldtimeparts.com
I believe they sell on ebay or call 888-399-7278.
Would be nice if others here add to the list for other sources of these rebuild kits. Maybe someone start a post for this discussion.
Note: Even 100LL Av gas seems to be hard on the fuel pumps especially the bottom cover. If you are unsure of the kit you bought them test it. Put some of the gaskets in ethanol and see what happens. You will be amazed.

[David L.]

Re: 65 sb fuel pump?

Dennis,

Pictured is a copy of the sheet that is in most NOS 4657 AC fuel pump boxes.

On the 4657 drawing the outlet is at the 1:30 "clock" position and the inlet is at the 7:30 "clock" position.

Refer to Joe's post.

Dave

[Joe L.]

Re: 65 sb fuel pump?

As Joe Lucia mentioned it's a whole new ball game today as far as rebuild kits for fuel pumps. I do not know if the Corvette repro catalogs have what you need or not. What you need is a kit that will with stand alcohol/ethanol. There are several companies around that sell these kits.
Try "Old Time Parts" sales@oldtimeparts.com
I believe they sell on ebay or call 888-399-7278.
Would be nice if others here add to the list for other sources of these rebuild kits. Maybe someone start a post for this discussion.
Note: Even 100LL Av gas seems to be hard on the fuel pumps especially the bottom cover. If you are unsure of the kit you bought them test it. Put some of the gaskets in ethanol and see what happens. You will be amazed.

John------


I'm not surprised that 100LL Avgas is hard on fuel pumps. It's hard on carburetors and other fuel system parts, too. The scavengers required in leaded fuel have always been hard on fuel system components, including and especially metal components. Fed a steady diet of unleaded fuel, all of the metal components of carburetors should be "immortal".

As far as the internals of NOS fuel pumps are concerned, for those with a screw-type pump, the answer is easy: use a modern kit with upgraded elastomeric internals. So, what about an old NOS crimped style pump? That's a good question.

[Dennis C.]

Re: 65 sb fuel pump?

John, Thanks for the source info for the correct rebuild kit needed.