66softtop

Need to replace my fuel pump. What is the difference between the AC Delco 40366 and 40083? Which one is correct for me?

65hihp

Lots of difference in the inlet / outlet configuration.
The 366 appears to be correct for the 396 and early 427.
The 083 is the correct FP for 65 327 SHP engines and possibly the 66 L79.

66jack

If you local GM dealer is any good they can get them for you L79...that is where i got mine for my 66/L79...

Tmichaelson

According to 1966 Corvette NCRS Technical Info And Judging Manual the AC Delco #40083 is for the L79 350 hp. The AC Delco #40366 is used for the L36 390hp and the L72 425 hp BIG BLOCK engines.

66softtop

You guys are great. Thanks for clearing that up. Mike

66softtop

Any idea what I should pay for one?

66jack

It's been about 3 years since i bought mine...so if my memory serves me, i want to say 70-80 bucks....

EDIT:::

Found my receipt....

Part #6415325...

I bought it 12-14-2012, it listed for $105.74..I paid $74.46 plus CA tax of $5.40...total...$79.86 PLUS NO SHIPPING

66softtop

Cannot rebuild mine as it is the crimped style that, I believe, came out in 1967. Anyone have a 1966 L79 GM#6415325, Part #40083, that's new or rebuilt for sale?

Powershift

LICS, Paragon, and a few others (CC and Zip??) sell rebuilt originals. Not certain who the rebuilder is.

I have heard that the core, etc is fine, but that not all the miscellaneous parts are totally correct…………although they are close and the pump will function okay. Price is around $200-300.

You can buy something similar without the logos for less.

Larry

Ironcross

/....

or your local auto parts store

66softtop

I've read that GM used several "authorized" manufacturers for their fuel pumps. AC, Carter, etc. Anyone know if this is correct? What would be the problem replacing my AC with a Carter?

Powershift

Probably nothing as far as function goes.

The NCRS Judges will not like it. Also, you MAY have to re-route the fuel lines, depending on the pump selected.

Also make sure that the pump you select has a capacity and discharge pressure in the range specified in the Chevrolet Service Manual. To low or to high a pressure can cause carb problems.

As Ironcross suggests, try NAPA for a generic replacement if the $$$ for the #40083 are too steep. NAPA still has good parts. Probably an Airtex brand. I think they are making pumps for ACDelco and others nowadays.

Larry

packrat

Beware of paying big dollars for the look alike 40083 fuel pumps with the incorrect tops and bottoms. Original 40083 pumps tops are magnesium, have additional gussets at the tower, have AC cast in the tower. Bottom has only inlet and outlet 180 degrees apart with those words cast into the base below each fitting. They do not have an additional 5/16 inch hole cast in the lower housing above the inlet in the lower base. Do your research on a real 40083 fuel pump.

6T5RUSH

66softtop,

If you are not hung up on the 40083 number, here's a few sites selling the AIRTEX 4657 which is functionally correct and bolts right up. I have had this pump on my 327 for 2 years now. No issues.

http://www.summitracing.com/parts/atx-4657


Here's AUTOZONES...no shipping needed;

http://www.autozone.com/external-eng...l-pump/192450/

Here's O'Reilly's:

http://www.oreillyauto.com/site/c/de...0401&ppt=C0025

and finally here's RockAuto:

http://www.rockauto.com/catalog/rafr...3&partnum=4657



Jim
In God We Trust!

66softtop

Thanks. I'm going to need the 40083 for my 350hp. The 4657 is for 300hp.

Rickenbach

I got one from Goat Hill Classics that has all of the AC castings and markings as original. The cost was pretty reasonable compared to Paragon.

66softtop

Would you PM me their website? Thanks Mike

66jack

Paul Baker is the fellow who owns Goat Hill. I haven't used them in awhile..

This is the last contact i had with them...I didn't buy anything from them..

2037 W. 16th St. Long Beach, CA 90813 562-437-7664 fax 562-437-1113 goathil@aol.com

Rickenbach

I don't think that they have a website. He rubs some people the wrong way, but so far mine works fine.

http://www.ebay.com/itm/1964-1966-Corvette-Hi-Po-Clone-AC-40083-Rebuilt-Fuel-Pump-/261650739439?pt=Vintage_Car_Truck_Parts_Accessories&hash=item3ceb9970ef&vxp=mtr