I have a 64 Deville Convertible, keep running into the same problem - vapor lock on hot days. So far I have rebuilt the carburetor , new gas tank , but when it sits in traffic on a hot day it will vapor lock .  It will take about 30 minutes for it to cool down, then starts up and runs again.  My Son said dont drive it on a hot day , think that is ridiculous.

Has anyone else run into this issue?  And does anyone know of any solutions or suggestions? 

Appreciate it 

Rick McBurney

Views: 1012

Reply to This

Replies to This Discussion


Pls give us the specific materials and spacer info you used to be solving your vapor lock problem 

This will benefit the people in our community who have that issue as an option 

I used all the stock gaskets and the stock black spacer from the stock Carter carb when installing my 1406 Edelbrock to my 64 - 429 ( old carb off and new bolted in ) 

I did have to block the PVC inlet in the black spacer as the new carb comes with a second one 

I had to go two stages richer on my metering rods and jets with the help of the Edelbrock techs (  very helpful ) as my plugs were burning a whitish color right after installing the carb ( lean fuel mixture ) 

Plugs when the correct color will be  burning a brown paper bag color 


I've been searching through all bills I still have from that time.

Haven't found it yet, but I don't give up.

I used completely different spacers from Edelbrock. Not the original ones.

Will search for the correct number this evening. 

But my spark plugs are just a little whiter too.

Which rods and jets did you use?

All jets and metering rods have numbers on them 

Give the numbers to the Edelbrock techs they will direct you 

Your local auto parts store ( Advanced Auto — etc ) will have your new  jets and metering rods 

I had to go two stages richer with my 64 - 429 when using the Edelbrock 1406 wit elec choke 


Here in Germany I don't have a shop that is really into that, so noone I could ask.

Did you call the Edelbrock guys or write them an email? 

i raised the fluel level in the Carter by leveling out the floats a bit higher, to no avail, engine still dies when hot and idling.

i watched the fuel level in the filter and when the engine stalls the level is really low, below the filter:

Replace the fuel pump. 

guess i have to.

but what seems odd to me is the fact, that the car runs perfect when i drive on the highway where the engine needs a lot of fuel!

only when hot and at idle speed the engine runs rough and stalls sometimes.


What is the condition of your engine tune - points - timing and proper idle speed adjustment speed 

The tune parts SB replaced every 6m miles per the service manual 

An out of tune engine ( worn points —dist cap - ign wires ) and a low idle will cause the engine to run hot and stall ( mostly retarded timing the result of worn points ) 

I would be changing the fuel filter and checking the  metal screen fuel filter located in the metal lines going into your carb for debris 

You need to know some  basics are correct as a base line to trouble shoot further 


If you change your dist cap - only get one with brass terminals  as any other will get you stranded someplace at some point in the future 


i installed a Pertronix 3 Ignitor a couple years ago, timing is 6-7 degrees BTDC.

did a full rebuild on the Carter a couple years ago.

car was running fine ever since and it was also hot as hell and had never experienced such problems.

i have a new Carter M3993 Fuel Pump at home that i ordered some time ago as a spare, never did anything on the fuel pump, will change it soon and let you know the result.

hope this Made in China Pump will last longer than others reported in this forum. 

Hi there

Well, I struggled with the same problem for the last few years with my 63 Caddy with AC.

I tried all kinds of tricks: shroud, bigger 7 blade fan blade, rebuilt carb, closed middle port under the intake, heat shield sleeve over the fuel lines, new fuel pump, actually PUMPS! Then I even found a guy who manufactures the heat shields that go under the carb… same s%#t. 

few weeks ago I ripped dash pad out, took the heater core out and … i replaced vacuum lines, heater core, vacuum units, water control valve, 17lbs radiator cap, replaced the thermostat with the 180F,  installed new blower motor etc

the test drive was two weeks ago during parade at Hot August Nights in Reno doing 2mph for 15-20min in the 90-95F weather! 
temp only came up to the half so I let the blower go for a bit which helped to drop the temp a bit.

it works, keeps the temp down and it was what I thought - extend the cooling system to its fullest via heater core which in my case was bypassed. 

therefore, I highly suggest you - do the same! Don’t waste your time and sleep over it like I did.

heater core is not that bad of a job and I am 6’7 and had no problem taking it out from

under the dash, just be patient :)

email me if you’ll need some help or even if you’re around Sacramento or Reno I could give you a hand with it .

You can always cool the engine down by turning on the heater — if it is running hot and the heater is working 

Depending on  outside conditions it could be less than comfortable for a while but will keep you from overheating the engine 

I have no issues with my 64 convert regarding vapor lock and at the moment my heater core is by passed but I mostly use the car when the temp is in the 80’s  in central Fl and she  does run amazing as is 




  • Add Photos
  • View All


Title and Frame VIN section for sale

Started by Russ Austin in General Discussion. Last reply by Jason Edge 7 hours ago. 10 Replies

For sale is the #1 frame cross member that has the vehicle VIN on it. Comes with the matching Arizona title in my name.  This is legal in Arizona, please check your state laws before putting this on…Continue

Steering gear compatibility

Started by Matti Roth in 1963/64 Cadillac Specific Discussion. Last reply by Matti Roth yesterday. 2 Replies

The steering gear in my 64 is leaking from steering shaft side and I need to rebuild it. I have used steering gear from 70`s Monte Carlo available. Is there any reason why not to use that temporarily…Continue

Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in 1963/64 Cadillac Specific Discussion. Last reply by Jason Edge yesterday. 1 Reply

To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue

Tags: ebay

Blog Posts

1964 power steering sector rebuild

Posted by CHRIS CARLSON on March 20, 2023 at 11:32pm 3 Comments

 I'm having my steering sector rebuilt, and considering changing it from 20-1 ratio 4.2 turns lock to lock to 3.5 turns lock to lock @ 16-1 ratio, If i change from a 3 1/4" box to a 3" box i could have a 14-1 Ratio steering response would be faster, shorter distance to turn the wheel to get a response,   has anyone done this? and how do you like it? thank you

1964 Daville dashboard clock

Posted by Willem Bol on March 13, 2023 at 11:33am 2 Comments


Can somebody help me finding a dashboard clock  for my 1964 Cadillac DeVille Convertible?

Thank you in advance,

Willem Bol

The Netherlands

Does anyone know where I can get the bushings for AC compressor mount on the 429?

Posted by Robert Schles on February 21, 2023 at 11:45am 2 Comments

I've looked at the usual rubber sources but couldn't find any. 

Need help with a hood latch

Posted by Curtis Dover on January 2, 2023 at 5:23pm 0 Comments

Hey guys, I need some help.  Could someone send me some pictures on how the first hood release lever on a factory 1964 Cadillac is set up, where it comes though the grille. Not the secondary one. I need to know where the thumb or finger position is located through the grille. Is it above or below the center grille molding piece? Mine seems to be positioned behind the center molding piece and will not adjust above or below the molding. I have a wire tied to it to release it…



  • Add Videos
  • View All

© 2023   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service