Caddy 54

Carburetor float Cadillac -54

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Please help,

I have hole in all 4 floats in my roschester carburetor. Where to find new one?

Ejje Sweden

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Ejje, Are they brass?, can they be soldered?

Which Rochester carb is this?, many used a Carter WCFB? Is this a Rochester 4GC?

See this, I like this site

http://www.thecarburetorshop.com/PartsRochester.htm

I called John (owner) from The Carburator Shop, here is a list of carbs for caddy through 1956

http://www.thecarburetorshop.com/Kcadillac1.htm

According to John, the brass floats can be repaired, see BRASS FLOATS at the bottom of this link:

http://www.thecarburetorshop.com/Carbshop_parts.htm

Finally, to identify your Rochester 4G carb see the following link, there is a tin tag on it, see this link to get the info, also sometimes the carb is stamped, in the photo see the 7221 model, stamped into the carb, but not all carbs are stamped, that triangular tin tag has the model number. He said that a LOT of different floats were used so you must have the model number. AND, he WILL have the float for you IF you can find the model number,

http://www.thecarburetorshop.com/Carburetor_ID_Rochester_4G.htm

Good Luck, Mike


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ejje, Are they brass?, can they be soldered?

Which Rochester carb is this?, many used a Carter WCFB? Is this a Rochester 4GC?

See this, I like this site

http://www.thecarburetorshop.com/PartsRochester.htm

I called John (owner) from The Carburator Shop, here is a list of carbs for caddy through 1956

http://www.thecarburetorshop.com/Kcadillac1.htm

According to John, the brass floats can be repaired, see BRASS FLOATS at the bottom of this link:

http://www.thecarburetorshop.com/Carbshop_parts.htm

Finally, to identify your Rochester 4G carb see the following link, there is a tin tag on it, see this link to get the info, also sometimes the carb is stamped, in the photo see the 7221 model, stamped into the carb, but not all carbs are stamped, that triangular tin tag has the model number. He said that a LOT of different floats were used so you must have the model number. AND, he WILL have the float for you IF you can find the model number,

http://www.thecarburetorshop.com/Carburetor_ID_Rochester_4G.htm

Good Luck, Mike

Hi Mike,

thanks for answer.

The Carb is a GM 4 JET with number 6963. This is the only number I can find.

The float is brass.

Can this information help me?

Thanks for helping me

Ejje

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Yes Ejje, I think those 4 numbers probably are the carbs model number

Where are you getting the model "GM 4 Jet"?

Do you think this is the original carburator?

Typically the manufacturer name will be stamped on it, this is a Rochester, correct?

Can you post a digital photo of the carb?

Thanks, Mike


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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OK, I just went to this link, for the Rochester 4G, and I searched the page for 6963 and YES 6963 is there as 7006963 and its for a 54 Cadillac 331.... WOW....

http://www.thecarbur.../Kcadillac1.htm

When I spoke to John from the carburator shop he told me if we could find the model number he would able to identify and have the correct floats for you.

If I were you, I would also buy a carb rebuilding kit that includes the accelerator pump if your carb has not been rebuilt lately. But you might want to buy a rebuilding kit and put it on your work bench so you have it one day.

How do you want to proceed? Can you easily call the US to speak to John, or do you want me to contact him for you? I am happy to be able to help you through this process if you need me to.


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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OK, I just went to this link, for the Rochester 4G, and I searched the page for 6963 and YES 6963 is there as 7006963 and its for a 54 Cadillac 331.... WOW....

http://www.thecarbur.../Kcadillac1.htm

When I spoke to John from the carburator shop he told me if we could find the model number he would able to identify and have the correct floats for you.

If I were you, I would also buy a carb rebuilding kit that includes the accelerator pump if your carb has not been rebuilt lately. But you might want to buy a rebuilding kit and put it on your work bench so you have it one day.

How do you want to proceed? Can you easily call the US to speak to John, or do you want me to contact him for you? I am happy to be able to help you through this process if you need me to.

Hi again,

thank you for your help.

The number is under "4 JET ". And another sign is "RP" Sign "GM 4 JET Carburetor".

I don´t know if it is a original. The carb was on when I bought.

For 1000 km I put a new carb rebuilding kit, so I don´t think I need a new one now. But if the price is right, maby.

I´m glad if you can check price and if it possible to find right carbfloat call me with price to Sweden.

Regards

Eilert

Ps. I tried upload photos of the carb but no luck. I do some wrong.

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Ok, Ill look into this for you, it looks like a Rochester 4G four barrel carburator.

Here is a photo of the 4GC in 1964, this is similar to yours, see the one on the right

http://www.tocmp.com/manuals/Carbs/Rochester/4-Jet/64RochesterServiceMan/images/Roch4G_0002_jpg.jpg


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Here is some more background info on your carburator, the 4G

Rochester 4-Jet carbs came in threegeneral versions:

  • 4G with manual choke
  • 4G with manual choke and governor in heavier trucks
  • 4GC with an automatic choke mounted on the side of the carburetor

http://www.carbkitsource.com/carbs/tech/Rochester/4G-index.html


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Here is some more background info on your carburator, the 4G

Rochester 4-Jet carbs came in threegeneral versions:

  • 4G with manual choke
  • 4G with manual choke and governor in heavier trucks
  • 4GC with an automatic choke mounted on the side of the carburetor

http://www.carbkitsource.com/carbs/tech/Rochester/4G-index.html

Hi,

here is some photos of the carb. I put them on my site.

The last 3 very big. Download to desk. Sorry. I didn´t make them small.

http://www.myharley.tk/carb.htm

Edited by ejje

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Those are great photos, Thanks

Ill call John, and see what I can find out for you and post here.

I have rebuilt that carb, and remember it well


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Those are great photos, Thanks

Ill call John, and see what I can find out for you and post here.

I have rebuilt that carb, and remember it well

Same here... :)

It has the heat operated automatic choke and progressive linkage for the secondaries.


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It was a nice carburator, but my next carburator was the Carter AFB, I can still remeber the secondaries snapping open with a deep WAAAHHHHHH


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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It was a nice carburetor, but my next carburetor was the Carter AFB,

I can still remember the secondaries snapping open with a deep WAAAHHHHHH

Yep... I remember them well...

Some of them had the big screw at the bottom front, right above the manifold, for adjusting the mixture.

I liked the old Quadrajets also... but a lot of people didn't.

You could get different metering rods for the primaries and make them get pretty good mileage, as long as yous stayed out of the secondaries.. :) :)


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Yes, the Quadrajet, is a great carburator also... I loved rebuilding carburators, it was amazing how much improvement you could reap.

I never got into the Holley carburators


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Yes, the Quadrajet, is a great carburator also... I loved rebuilding carburators, it was amazing how much improvement you could reap.

I never got into the Holley carburators

It was amazing how much you could get out of them if you did it RIGHT and knew what you wanted it to do... and then work towards that goal.

I had a Holley on my 1970 340 Duster, on my '73 427 Chevy, on my '74 454 Chevy and on my '76 Big Block 402 Chevy Caprice.

I got rid of the crappy Variable Venturi junk on my 1981 Crown Victoria and changed it to an Edelbrock intake and a Holley 4 barrel.


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Very cool Jim, as much as fuel injection is superior to the carburator, I still miss carburators


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Very cool Jim, as much as fuel injection is superior to the carburator, I still miss carburators

I am not sure fuel injection is all that much superior...

The 1976 Caprice I had with the 402 Big Block... would get low 20's in mileage.

The 2006 Cadillac with a 262 NorthStar gets in the low 20''s in mileage...

They both weigh close to the same...but with the 402, I had tire smoking torque and HP...

Makes me wonder...which is really better...


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Ok, I spoke to John at the Carburator Shop.

He has used floats for your carburator. They have been tested. He sells them as part of a Level 3 repair kit that includes the rebuilding kit for $306 plus shipping to you. He uses United Parcel and shipping is about $100, he won't use the US Mail as its not reliable.

That seemed expensive to me, but he stated that he has a limited supply of floats for your carburator. He said that the company that manufactured the floats is still around, and they are $80 each but you must purchase a minimum of 1000 units, for $80,000, so that is not an option at all.

He said he knows that his price is steep and that is why his site includes directions for repairing the floats. He said that pin holes can be soldered but vertical stress cracks can not be repaired. Do you think you can repair the floats?

You can contact him directly via emai, a link to it is on his site and you can always call him. He accepts major credit cards.

If you need me to step in and help, let me know.


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok, I spoke to John at the Carburator Shop.

He has used floats for your carburator. They have been tested. He sells them as part of a Level 3 repair kit that includes the rebuilding kit for $306 plus shipping to you. He uses United Parcel and shipping is about $100, he won't use the US Mail as its not reliable.

That seemed expensive to me, but he stated that he has a limited supply of floats for your carburator. He said that the company that manufactured the floats is still around, and they are $80 each but you must purchase a minimum of 1000 units, for $80,000, so that is not an option at all.

He said he knows that his price is steep and that is why his site includes directions for repairing the floats. He said that pin holes can be soldered but vertical stress cracks can not be repaired. Do you think you can repair the floats?

You can contact him directly via emai, a link to it is on his site and you can always call him. He accepts major credit cards.

If you need me to step in and help, let me know.

Hi Mike,

thanks very much for your help.

I did repaired them. Hope they will hold tight.

Regards

Eilert

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That is great Eilert, if you need any help in the future, let me know, Mike


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi Mike,

Now I have a big probleme. My caddy have started with vapor lock this summer. People say it´s more ethanol in the fuel and I have to mont an Electric fuelpump.

Is it same probleme in US with vapor lock? and if what do you do?

Regards

Eielrt

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Hi Mike,

Now I have a big probleme. My caddy have started with vapor lock this summer. People say it´s more ethanol in the fuel and I have to mont an Electric fuelpump.

Is it same probleme in US with vapor lock? and if what do you do?

Regards

Eielrt

I'm not Mike... but a couple of suggestions...

Check the fuel pump pressure of the factory fuel pump... It may be low, or the check valve in the factory mechanical pump may be bad and allowing the the pressure to bleed off when the car is stopped.

It is also possible that the diaphragm inside the pump is leaking.

"MAYBE" all you need to do is replace the factory mechanical pump.

You should NOT need to add an electric pump.


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Hi,

Thanks.

I have done all that. I have tried fuel line tape insulator and other things. I talked with other old Cadillac owners, they have same probleme. When they put in Electric pump, no probleme.

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Vapor lock is normally caused by fuel in the line between the mechanical fuel pump and the carburetor getting hot and turning to vapor when you shut the car off after running for a period of time.

If the diaphragm OR the check valve in the stock pump is leaking a little bit.. it will allow the pressurized fuel in the line to lose pressure.

When it is NOT under pressure, it will vaporize at a much lower temperature than it will if it IS under pressure.

You can add a low pressure elect pump and solve the problem... or you can correct the existing problem and keep everything stock... if that is your goal.

When I said earlier to check the pressure... I should have elaborated more.

I meant to check the pressure in the line after it has set for a little while.... not while cranking or with the engine running.

I think you will find that the pressure is NOT maintained in the fuel line when you stop the engine.

When the cars were new... they DID NOT have a vapor lock problem.
When I was much younger...I had an uncle and a sister in law that drove the ones like like you now have.

They were new (WAY BACK THEN) and did not have a vapor locking issue.


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