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brdavisboise

Posted 2022-07-17 1:35 AM (#622921)
Subject: Carb leaking gas- Won't start.

Member

Posts: 11

RE: '57 Desoto- Carter WCFB carb (2588S)
Problem: Engine won't start, and Carb has EXCESSIVE fuel seeping from float bowl gasket and top of carb! (Float bowl may be overflowing).
Question #1: Is the 6-1/2 pounds of fuel pump pressure too much and pushing past the float needle valves?
Question #2: Is there a way to "see" the fuel level in the float bowl under actual conditions?
Question #3: What are the two (2) inspection screws on the side of the float bowl? (See RED circled screws in attached diagram).

Edited by brdavisboise 2022-07-17 1:40 AM

(Carter WCFB (2588S) (4).JPG)

Attachments
----------------

Carter WCFB (2588S) (4).JPG (39KB - 76 downloads)

56D500boy

Posted 2022-07-17 2:41 AM (#622924 - in reply to #622921)
Subject: RE: Carb leaking gas- Won't start.

Expert 5K+

Posts: 9904
5000

Location: Lower Mainland BC

.
Others, more knowledgible than I am, will correct me if I am wrong or provide better answers. However, in the interim, I offer the following:

The answer to Question 1 is "Not likely". From the 1957 Chrysler Factory Service Manual (FSM) regarding the fuel pump.

"Fuel pump pressure should be from 6 to 7
pounds. This pressure should remain constant,
or return to zero very, very slowly when engine
is stopped. An instant drop to zero on the
testing gauge indicates that outlet valve is
leaking. Inlet and outlet valves are not serviceable.
If necessary, replace the complete valve
housing assembly."

If you have 6.5 psi pressure, it could be that the needle valve/seat is not sealing and shutting off fuel when fuel fills the bowl(s) and the floats come up and press on the blunt end of the needle valve.

If you don't have a 57 Desoto FSM, you might want to download the 1957 Chrysler FSM from Mymopar.com. It will be very much the same as the Desoto equivalent.

https://mymopar.com/service-manuals/

The section about the Carter WCFB 4 bbl carb starts on pg. 176/458 of the pdf (174 in the document). I am sure that the answers you need are there.

There are lots of rebuild kits out there. Pretty sure that you will need one.

The answer to Question 2 is most likely "No"

The answer to Question 3 is most likely "Maybe". (I couldn't find them referenced anywhere - maybe I'm just blind).

REFERENCE: https://www.carburetor-blog.com/wcfb-views/

Good luck

Edited by 56D500boy 2022-07-17 2:45 AM

Shep

Posted 2022-07-17 10:05 AM (#622932 - in reply to #622924)
Subject: Re: Carb leaking gas- Won't start.

Expert

Posts: 3396
2000

Location: Chestertown, NY ( near Lake George)

Very critical to set he floats properly, done wrong they can contact the float bowls and get stuck causing flooding, there are multiple steps to doing this, all outlined in the shop manual.

ronbo97

Posted 2022-07-17 11:56 AM (#622934 - in reply to #622932)
Subject: Re: Carb leaking gas- Won't start.

Expert

Posts: 4042
2000

Location: Connecticut

The WCFB is not a simple carburetor. I recommend sending it out to Daytona Carburetor for an expert rebuild. That's what I did for my 55 Desoto's WCFB 2210S. Cost is about 4 - 500, but well worth it. Mine had a wobbly throttle shaft, which was causing a rough idle/stalling.

www.DaytonaParts.com

Ron

Edited by ronbo97 2022-07-17 11:58 AM

brdavisboise

Posted 2022-07-23 5:36 PM (#623127 - in reply to #622924)
Subject: RE: Carb leaking gas- Won't start.

Member

Posts: 11

Thank you for your suggestions and all the detail you put into your reply to me!
I have already rebuilt the carb, but will recheck float level and alignment.
The Factory Service Manual is good, but oddly does not mention the purpose of those two plugs in the side of the float bowl!
I will re-check my float settings, and then see if fuel pours out of those two bowl plugs. (Another person says the actual fuel level should be just below the plugs).

Ev's62Chrysler

Posted 2022-07-24 8:31 AM (#623136 - in reply to #622921)
Subject: Re: Carb leaking gas- Won't start.

Veteran

Posts: 210
100

Location: Suwanee, GA

I had similar problem with my 62 carb. This last time I had it apart, with top half fully assembled and upside down to simulate full fuel situation I blew compressed air (very low pressure) in through the inlet to find air leaking past one of the needles. Changed that needle, and it fixed my problem.

wizard

Posted 2022-07-24 12:33 PM (#623143 - in reply to #622921)
Subject: Re: Carb leaking gas- Won't start.

Board Moderator & Exner Expert 10K+

Posts: 13049
5000

Location: Southern Sweden - Sturkö island

The nozzle/needle can be grinded to a good seal using toothpaste and elbow grease....

Chrome58

Posted 2022-07-25 2:24 AM (#623155 - in reply to #622921)
Subject: Re: Carb leaking gas- Won't start.

Expert

Posts: 1316
1000

Location: Belgium, 40 miles south of Brussels

I had the same problem with the primary WCFB in my '58 2x4bbl setup.
It regularly flooded the engine and, even worse, let fuel seep out on the intake, making puddles, which is highly dangerous.
The carb had been professionnally rebuilt in the first place, and even after two addtional rebuilts that I did myself, the problem never went away.
In the end, I removed the 2x4 setup and bought an Edelbrock carb.
Problem solved.

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