B carburetor fuel starvation

[CWPASADENA]

A friend brought his Model A to my shop with a fuel starvation problem. His engine is a relative stock A that he installed "B" carb and intake manifold.

On level ground at about 40 MPH, the car runs fine but on the highway at 50-55 in overdrive , it will run fine for a bit and then start to loose power and the engine will quit. Coast along for 10-15 seconds, the car will start and run fine only to loose power and quit again.

After doing all the usual checks for fuel restriction which turned up nothing, the B carb was replaced with an A carb. The car ran fine.

Took the carb apart and found a "Grose" Ball Type float valve. This valve appeared to be very restrictive. Everything else looked good, the float drop was good and there was no auxiliary float spring.

Replaced the ball type float valve with a used original B float valve from my spare carb parts. Now car runs fine with the B Carb with an original float valve.

Question???

Where do I find original B Carburetor float valves?

Chris W.

 

[Brian T]

Snyders now have the conventional needle and seat for the B carb B-9564-OR, I have had that same problem with the Gross jet, can be a serious problem depending when the engine stops running.
Brian.

 

[CWPASADENA]

Snyders now have the conventional needle and seat for the B carb B-9564-OR, I have had that same problem with the Gross jet, can be a serious problem depending when the engine stops running.
Brian.

Hi Brian,


Thanks for the info,


I looked in all the other catalogs except Snyder's.


Chris W.

 

[31a]

I believe Renners corner will have those also Bob

 

[duke36]

We've had same problem with grosejet valves. Renners suggests to blow thru them to test if they leak air, etc. We try to find the viton tipped original style. Also, sometimes float levels are too low and starve the carbs for fuel when on steep upgrades.

 

[CWPASADENA]

I believe Renners corner will have those also Bob

I checked Renners and only found the ball type float valves.


Chris W.

 

[modelAsteve]

Do you have the "B" carb set up to runoff the fuel pump with the tiiny spring on the float?

 

[denniskliesen]

I checked Renners and only found the ball type float valves.


Chris W.

Call on the phone. Dave will have what you need from my past experience.

 

[Jerry in Shasta]

There is a look alike groose jet valve that does not pass enough fuel for high speed runs, or pulling a hill.
Stipe machine works makes and sells a good ball style valve. http://www.stipemachine.com/

 

[CWPASADENA]

There is a look alike groose jet valve that does not pass enough fuel for high speed runs, or pulling a hill.
Stipe machine works makes and sells a good ball style valve. http://www.stipemachine.com/

May be that is the problem. The ball type float valve I took out was very small in the fuel passage. I thought there was only one manufacturer of the ball type valve. May be the one I had was something that came from China and was poorly done as so many other parts from China I have encountered.


Thanks for the info.


Chris W.

 

[CWPASADENA]

Do you have the "B" carb set up to runoff the fuel pump with the tiiny spring on the float?

No, the B Carb did not have the auxiliary spring on the float which is necessary when using with a fuel pump.


Thanks for your input.


Chris W.

 

[CWPASADENA]

Call on the phone. Dave will have what you need from my past experience.

I will do that,


When I have a question, I know I can always find good information on The Barn.


Thank you and everyone else for your input.


Chris W.