The Stovebolt Site Forums The Shop Area Engine Shop Weber 32/36 dripping into primary

I have a Weber 32/36 on my '61 pickup's 235. It's only been run less than 400 miles. I've been having problems with high idle speed that I can't adjust away, and it stumbles when accelerating at low- to mid-throttle.

While investigating the problem, I noticed that in the primary, fuel is dribbling from the area of the venturi onto the throttle valve.

An internet search points toward either a float set too high, needle valve not seating properly, or incoming fuel pressure too high. When I took the top off the carb, the fuel level did not seem excessive. I adjusted the float downward slightly, and checked the needle valve for operation. I also installed a fuel pressure regulator, and progressively dialed it down as low as 1.5psi, without any changes.

The "Stovebolt Site Search" box at the left of the screen searches the whole internet, not just the site...so I tried browsing message threads to see if anyone's had the same problem.

Anyone have suggestions?

-Kevin

To search the site only use the magnifying glass in the upper right just below your username.

You need about 3 pounds of pressure. What regulator are you using, what fuel pump, and what gauge are you using?

Stock mechanical fuel pump, Mr. Gasket fuel pressure regulator, Lisle fuel pressure gauge from my fuel injection testing kit. As I mentioned, I dialed it down as low as 1.5psi, with no change.

-Kevin

The mr gasket is not a great low pressure regulator. You want to consider using a redline regulator

https://www.carburetion.com/Products/ProductDetails.aspx?Part=31800.050

Or the higher end aeromotive regulator

https://www.pegasusautoracing.com/productdetails.asp?RecId=26867&msclkid=3fb6c1eb59a01924b5e0a19515eb0c65&utm_source=bing&utm_medium=cpc&utm_campaign=Shopping&utm_term=1100404266713&utm_content=Ad%20group%20%231

You also need to use a low pressure gauge that is accurate. I went through them all, really difficult to find one that is accurate at the lower end of the reassure spectrum. This is the one I ended up settling on

https://aeromotiveinc.com/product/0-15-psi-fuel-pressure-gauge/

From your description it sounds like too much pressure and it’s overcoming the needle.

I did a little experiment today:

I disconnected the fuel line to the carb, so the fuel pump could expel into a gas can. Then I got a plastic pint bottle of gas that I use for engine 'first start' events, and connected it to the carb. No pump pressure, just gravity feed from the pint bottle.

I started the engine...and it still dribbles.



-Kevin