TheSamba.com :: View topic

Sun Oct 08, 2006 11:24 am

'73, type 4, 1.7 L, dual 1 barrel Webers.(1 adjustment screw)

Had a problem with the carbs, soo...

Hooked up my remote starter, took off both air filters and started it.

When I give it gas, I can see the passenger side carb dripping gas out of the little tube in the throat, but the problem one, the one on the drivers side, nothing is dribbling out...Is something plugged up in there? Can I somehow clear it out?

Strangely, I'd had a problem with gas dripping out the throttle bushing at a pretty good rate on this (driver's side) carb. On this run, the area got a little damp looking, but that was it.

Engine was way unbalanced. With the drivers side running lean...The engine started popping, so I shut 'er down.

Mon Oct 09, 2006 7:39 am

If you have a progresive Weber (32/36) you should see a squirt of gas (similar to what you would see from a can of WD 40 through the straw) out of the accelerator pump jet on one side only. The "progressive" side (the side the throttle is delayed in opening) does not have a hole for the gas squirt. This always seemed odd to me as the nozzle is there, just not drilled. With the key off you should get 4 or 5 good squirts out of accelerator pump jet when you manually open the throttle. If you don't , you have a fuel blockage, or more likely, your accelerator pump diaphragm is damaged. The accelerator pump is just a diaphragm/spring combo that pumps a squirt of gas into the carb throat when the throttle is opened quickly. Remove the four screws holding on the cover plate and have a look at it.

Another possibility is a blockage in the bottom of your float bowl. There is another jet that allows gas to be drawn into the throat when the throttle is opened quickly called the full power valve. You will need to remove the top of the carb by removing 5 screws, the choke linkage, and the gas line. At the bottom of the float chamber there is a slot head valve assembly that can be removed. Clean out the hole it came from which is often filled with sludge. Its difficult to see but there is a drilling that leads to the throat from the side of this hole.

Mon Oct 09, 2006 12:23 pm

Frozenbutt wrote: The accelerator pump is just a diaphragm/spring combo that pumps a squirt of gas into the carb throat when the throttle is opened quickly.

I took the one carb apart and the plunger is squirting gas out.

Frozenbutt wrote:
Another possibility is a blockage in the bottom of your float bowl. There is another jet that allows gas to be drawn into the throat when the throttle is opened quickly called the full power valve. You will need to remove the top of the carb by removing 5 screws, the choke linkage, and the gas line. At the bottom of the float chamber there is a slot head valve assembly that can be removed. Clean out the hole it came from which is often filled with sludge. Its difficult to see but there is a drilling that leads to the throat from the side of this hole.

I'll try cleaning this out.

Was talking to a coworker and he admited to not being a Weber expert, but he thougt that the constant dripping I saw on the other carb was a problem also. That the gas should be vaporized in the throat and not drip, drip, dripping all the time. Should I be able to see some sort of misty gas haze in the throat?

Here's a picture of one of the carbs. They are Brasil made, I think somewhat similar to the ICTs.

Wed Oct 11, 2006 5:48 pm

Those could be baby dells,
1. Check the fuel pressure
a. Make sure the are syncronised, and the engines valves are adjusted.
2. Disassemble and clean, rebuild as needed. Call CB Performance and send them a picture. They sold them so they should have the kits.
3.The shafts are worn so have them re-bushed $60.00 at a place in Franklin Park.
4.Smile!

Fri Oct 13, 2006 6:34 pm

Ok, actually got it to stop leaking, for awhile, not sure what I did, other than take the carb apart and make sure everything I could get at was clear and applied a liberal dosing with the carb cleaner.

Took the other carb apart and I think the float was a bit sticky. Doused it with carb cleaner, seemed much better. Put everything back in.

The leaking came back, I went into the engine compartment as best I could and I think the leaking is coming from the gasket between the carb body and whatever that piece is that houses the throttle plate. I don't think I can buy a gasket anywhere, but it's a pretty simple one, can I buy gasket material at an auto parts store? And make my own?

Also, and this give me pause, when I shut the engine off the carb that was leaking gas, when I looked down the throat, gas was dribbling at a pretty good rate onto the throttle plate, there was a pool of gas gathering on the throttle plate!!! That just seems like a bad sign.

Fri Oct 13, 2006 7:15 pm

Check your fuel pressure from the pump.