Weber 32/36 with electronic fuel pump flooding - help please

[matthewjacob]

Hello 

 

1 have been having a issue with my stock 2002 motor with a Weber 32/36. The carb is less than 2 years old, and the car is relatively new to me. The fuel pump and carb were placed on via the previous owner. 
 

issue: when I turn the key to the first click (on/run) the electric fuel pump starts and starts to flood the carbs. Gas starts to pour out and into the butterflies. Like a small fountain not a drip (Attached pic circled area) I thought maybe I could pull the carb and check the floats. I have the plastic floats and set them according to pierce manifolds. 35mm on side and 51mm on flat. After setting the floats, I put it back on the car and still have the problem. 
 

i have ordered a nice fuel pressure regular ( glass bowl can’t remember name but the one everyone on here recommends)  as I have read on the forums that webers don’t like higher fuel pressure. 

 

i am pretty new to all of this and  have been doing a lot of read on the forums and the shop manual and the Haynes but haven’t been able to figure this out. Any advice would be welcomed. Regulator is a good place to start but assuming I’m also having a carb issue. 
 

 

 

[John76]

The circled area on your picture is where the gas floods when the float level is too high.

This can be caused by:

-Too much fuel pressure. Weber 32/36's like 2-3 psi max.

- Debris in the float needle, keeping it open.

- Plastic floats tend to get heavy and sink in our ethanol laden fuel. Unusual for a 2-year-old float, but possible.

-Fuel return valve missing or not installed properly.

 

 

 

[Son of Marty]

The needle valve may have come loose also, or fuel pressure is too high. you can also weigh the float to see if it's compromised should be 11 grams or less for the plastic float.

Edited March 31 by Son of Marty

[matthewjacob]

On 3/31/2024 at 7:08 PM, Son of Marty said:

The needle valve may have come loose also, or fuel pressure is too high. you can also weigh the float to see if it's compromised should be 11 grams or less for the plastic float.

 
thanks for the help. It was the floats. 24 grams. New floats and needle + finally got around to installing the pressure regulator and seems to be running nice again. 

[Stevenc22]

Which fuel pump do you have? The pressure regulator will help but its best to just start with a 2--4psi pump

[matthewjacob]

The pump was previously installed by the owner before me. Forgot off the top of my head, but seems to be a 2-4 psi as even with the regulator it seems to constantly sit around 3psi. 
 

was pretty proud of my noobie self for changing out the floats.  And getting this thing going again. 
 

next up, get a timing light and adjust timing, plugs, and then end with a carburetor adjustment to get her running good for the spring. 

[matthewjacob]

On 3/31/2024 at 6:56 PM, John76 said:

The circled area on your picture is where the gas floods when the float level is too high.

This can be caused by:

-Too much fuel pressure. Weber 32/36's like 2-3 psi max.

- Debris in the float needle, keeping it open.

- Plastic floats tend to get heavy and sink in our ethanol laden fuel. Unusual for a 2-year-old float, but possible.

-Fuel return valve missing or not installed properly.

 

 

 

Thanks again for the help with this. Got the floats changed over new needle and pressure regulator seems to be doing the trick 

['76mintgrün'02]

4 hours ago, matthewjacob said:

next up, get a timing light and adjust timing

 

The Innova 5568 is a very nice light.  Well worth the cost.  Shopping around online should get you one for just over $100 (last I looked).

Tom