Dual Carbs have fuel leaks - Dodge 218

[fortymopar]

Hey all - I could use some help...

 

I've installed an offy dual carb manifold on the 218 in my '40 Dodge coupe.  I have a couple of rebuilt Stromburg BXVD-3 carbs installed, and I'm using Fenton split exhaust manifolds.

  

When I crank the engine I'm getting fuel leaking from both carbs.  I believe the bulk of the leaking is around the throttle shafts, but one carb is ending up with fuel on the underside for the bowl.  (These carbs were supposed to have had new throttle shaft bushings installed.)

 

My initial thought was that I'm getting too much fuel pressure to the carbs, but I have an Aeromotive regulator installed.  The pressure is cranked down to 1.5 psi, and still I have fuel coming out.  

 

Also of note - this is the second set of carbs that I've had on the engine.  I had a pair of rebuilt Holley 847s installed, and they were also leaking fuel.  

 

Starting to think something else is amiss, but not sure.   Anyone have any ideas?

 

Thanks!!

[Plymouthy Adams]

you can also suffer from a big high float level and get similar conditions....you can set the float for a tad lower level and never have to worry of running out of fuel at WOT

[T120]

Have you checked the fuel pressure at the carbs with a gauge?

[Sniper]

Both replies hit on possibilities, also, check for crud keeping the check needles from seating, especially since this is a the second set of different carbs doing this.  You may have rust or other junk in the tank being pumped up to the carbs and fouling the seat the fuel shutoff needle seats on.  Do you have a good fuel filter?  Or is it the same one?    It's possible that the filter is the source as well.

[Jeff Balazs]

All good ideas here. Fwiw I had a fuel pressure regulator fail that was only in service for about 6 months. My guess is the answer is here among these suggestions.

Jeff