Quadra jet questions

**Joe L.** · January 9, 2006, 07:31 PM

Re: Quadra jet questions

Mark------

"EEC" refers to "evaporative emissions control". It was first installed on 1970 model Chevrolets and other cars shipped to California. So, if your car was originally shipped to California when new, it should have had the EEC system, including the GM #7040507 carburetor. Another major element of the EEC system is the charcoal cannister assembly which can be found in the driver side rear front fenderwell area (in the vicinity of the vacuum resevoir tank). Of course, it's possible it has been removed. If so, the fuel return line from it to the fuel tank on the DRIVER'S side should remain; rarely is this removed.

Your build sheet or other original documents, if you have them, should confirm if the car was originally delivered to California.

The 7040507 carburetor is VERY likely original to the car. It's the one that a 1970 L-46 with EEC should have. The manufacturing date, located near the part number, should help confirm this. It's very unlikely that this carburetor is a SERVICE unit. I can find no record that the 7040507 carburetor was EVER available in SERVICE, under this or any other part number.

As far as the Torx screws go, I don't recall that these were used that early, but it's possible. It's also possible that they were used as part of a previous rebuild and are not original to the carb. It seems unlikely, but it's possible.

The 7040507 carburetor is quite rare and valuable. I would not let it out of my sight.

**Mark Trent** · January 9, 2006, 09:33 PM

Re: Quadra jet questions

Joe - thanks for the reply. I don't believe mine was an eec car, because I have the protect-o-plate and it shows it being delivered new to the owner in St. Louis. That said, this carb must not be the original.

The only numbers next to the serial # are 0983... I don't get that, because if it's a Julian date, then it would be the 98th day of 1973, or April 8th of '73 ???

But, when I check for '73, the 7040507 isn't listed as a vette carb. So, could it be for another GM model, or a service (replacement) unit?

The year thing is stumping me!

Mark

**Joe L.** · January 9, 2006, 11:18 PM

Re: Quadra jet questions

Mark-----

Yes, the date code would indicate that it was manufactured on the 98th day of 1973. As I mentioned, I don't find that this carburetor was ever available in SERVICE. However, that's through the GM parts system. It may have been available through the Delco parts system. This pretty much has to be a SERVICE carburetor. In PRODUCTION, this carburetor was used only for the 1970 model year.

**Dennis D.** · January 10, 2006, 04:27 PM

Re: Quadra jet questions

My non calif L-46 carb 7040207. Another pricy one

**Harold# 43147** · January 12, 2006, 11:39 PM

Re: Quadra jet questions

Mark the only difference in the 7040207 & 7040205 is a smaller idle port in the base. Why they did this was to restict idle enrichment. Also the 507 will not have hot idle compensator on front of air horn.Primary & Secondary Metering are the same. They did make S/R I have restored them before I think I have one in my Inventory. 207/204/205 are hard to come buy and you will pay a premium for one that looks like it was drug up from the Titanic. Torx are not correct 10-32 Fillister Head Black Oxide are correct.Evap Can would be on the car and there would be a nipple on the gas tank drivers side for Ca. car.
Harold

**Mark Trent** · January 15, 2006, 10:45 AM

Re: Quadra jet questions

Are there different diameter-sized accelerator pumps? The one I removed was very lightly snug in the bore of the carb, but the replacement one I used fit really tight - in fact too tight. The rubber ring on the piston was keeping it from returning to full upright. Could this be a quality control problem with the replacement, or is it the wrong size? Thank you - Mark

Quadra jet questions

Quadra jet questions

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