Weber 40 IDFs are dripping when parked

[malcolm2]

Full complete, successful Dual Carb set up was done in May.

Nice day to drive yesterday. Needed gas, so I filled up. Did some more driving, then parked for the night.

Garage was strong with gas smell this morning. A small pool under one side, so I pulled the air filter and see a frequent drip into one barrel. The other is damp, so it is probably dripping too.... same as the other side. Butterflies are damp after 12 hours of being parked.

All the visible edges of the gaskets are wet too.

You think it is a stuck float problem?

Electric pump... about 2 psi, when running. Even with a stuck float, there would have to be residual pressure, right? Might have stopped during the day sometime, I guess.
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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing)

[Wildthings]

The floats have to be leaking so should be addressed. As an additional precaution you could add a marine anti siphon valve to the supply line or an electric fuel cutoff.

[richparker]

Definitely need to check the float height. You should also look into some Phenolic spacers if you do not already have a set.
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’71 Westy build
Adventure thread
’65 Deluxe Build
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[malcolm2]

[Wildthings]

[richparker]

I was talking about using them between the carb and manifold. It’s hot in the summer and cold in the winter in my geographic location. I run them all year long on both of my ACVWs, no issues.
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’71 Westy build
Adventure thread
’65 Deluxe Build
’63 Deluxe Build

[malcolm2]

Is this normal....

As I said, full tank of gas.

I removed the top of the carb. I put the hose from the top plate into a bucket. I have a constant drip. 1 per second. I can move that hose around up and down in the bucket and the drip keeps coming.

So the siphon rule would say, when the exit of that hose is below the top of the fuel in the tank, I would get flow... or in this case a drip? And proper float needle setting is gonna stop that?

I have a hose from the electric FP up to a FP regulator that splits to the carbs.
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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing)

[richparker]

It’s not normal. I’ve had nothing but good success with IDF carburetors, both Webers and Chinese knock offs. Did you go through the carbs, clean and set them up properly before you installed them?

Here’s a video on setting up a pair of Empi carbs. I know they are not Webers, but they are a copy of Webers. There’s another video showing how to set the floats. Maybe I’ll find it, or you can find it I bet.


Link


Here ya go


Link

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’71 Westy build
Adventure thread
’65 Deluxe Build
’63 Deluxe Build

[malcolm2]

RIP AC.net.

Paid extra for their service of cleaning and set-up for my application. Then I went thru the BEST LEAN IDLE.... many times, and used a snail to sync them up. So running wise, I think all is well. Not running, the gas keeps flowing or dripping at least. I suppose it is partially from a FULL tank.

Float did not leak as I held it under water for a time. The settings are not per the weber manual.... 10mm and 32mm. Going to re-install and see what happens.

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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing)

[Willin]

I had this issue. Worse in hot weather. There were a couple things...
Got some float needles with the rubber tips. My metal needles leaked. They wouldn't hold a pound of pressure.
Check your fuel pressure, if you haven't. I found that something happened to my cheap, low psi electric pump, and it maxed out my gauge when I checked.
The phenolic spacers between the carbs and mani will come in handy when it's hot in the summer. They seem to be a good idea.
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73 bus. Org. 1700 with dual Weber 40 idfs, bus header with Empi qp muffler, CB magnaspark 2 " ready to run kit".

[malcolm2]

https://www.ebay.com/itm/364020184156

I see a few rebuild kits with the rubber tips.... VITON

AMAZON TOO.

https://www.amazon.com/HENKYO-Weber-Rebuild-Repair...mp;sr=1-13

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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing)

[aeromech]

Leaking needle valves. Replace them and be happy
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Boeing 727,737-200-300-400,757,767
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[Abscate]

Perfect time to put in a nice brass stopcock fuel shut off . With oetinger clamps, chafe and strain relief, allowing fuel shut off

If you hide it a bit, it doubles as theft prevention from driveoffs
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.ssS!

[malcolm2]

[Willin]

Rubber = Viton
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73 bus. Org. 1700 with dual Weber 40 idfs, bus header with Empi qp muffler, CB magnaspark 2 " ready to run kit".

[aeromech]

Viton=best quality
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[malcolm2]

seems that there are tons of folks selling stuff that fits Weber.....

May or may not be Weber, right? Any vendor that any of you recommend?
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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing)

[Wildthings]

[obieoberstar]

I had a similar issue with my IDFs. They were purchased about 6 years ago.

The Left side carb would get moist while it was parked.

Replaced the float and needle valve assemblies on both carbs with parts from Pierce Manifolds. Genuine Weber. I would not trust unbranded bargain parts.

https://www.piercemanifolds.com/

[Abscate]