Re-installing webers. Help

[D.Ehinger]

First. Thanks to everyone for the help. I'm pretty new to this so forgive me if my questions or terminology is off.

I rebuilt my Webers with one of Paul's kits. It looks to me like the drivers side bank of carbs is not getting fuel to the pump jet. If I stick my head down over the carbs (car off, fuel pump running or not running) and actuate the throttle I can see small squirts of fuel exiting the pump jet, but only on the right bank of carbs. Nothing on the left bank.

I did rebuild the accellerator pump on that side, but I've since taken it apart to ensure I did it correctly. I removed the fuel line from the banjo fitting, ran the fuel pump and it's working correctly. I don't see fuel from any of the three pump jets.

Do the carbs need to be primed? Could I put something with pressure, like a brake bleeder, with fuel in it and force some fuel through the carbs?

Just looking for ideas. Thank you.

Don

[Irish911]

Have you looked to see that the fuel bowls are filling up on that side. Just remove the top part of the carb and look down into the bowls or install a fuel bowl gauge and run the pump. If they are empty your valves aren't opening. Floats not installed upside down? If they have fuel in them then it could be the accelerator pump if all 3 jets are not working. Did you disconnect any of the linkage going to the accelerator pump? Anyway, a few things to check. Let us know how you make out.

[D.Ehinger]

99% sure my fuel bowls are not filling. When I pulled the carbs off there was no fuel in there. Which valves should I check? Thank you.

[Irish911]

Don't know the terminology but there are two valves that control the flow of fuel to the bowls where the two banjo fittings are located. You no doubt replaced the two valves with new ones when you did your rebuild. Take them out to see if the little knob on the bottom of the valve moves up and down. Also make sure the floats are installed correctly (not upside down). Did you check to make sure the float divot wasn't bent?

[mike curnow]

Here is how it works. There is nothing, except a filter between the fuel pump and the inlet to the carbs. The fuel flows into the banjo fitting which has small holes in its circumference and a large hole running its length, make sure all holes are open. There is a fine metal screen surrounding the banjo bolt, make sure it is clean. The fuel flows into the top casting of the carb and into the hole where the ball check valve screws into, make sure this passage is clear. Before screwing in the ball check valve blow in the open end, you should be able to blow through it. While doing that push in on the little pin that sticks out on the other end and the valve should stop you from blowing through it. There should be one fiber washer on the valve. Check the float, when fuel flows into the bowl the float rises and pushes up on the small pin in the valve closing the flow of fuel. You don't need any more pressure than the fuel pump puts out. Also since one side works compare it th the non working side.

Mike Curnow

[1QuickS]

It could be that fuel is in the bowls but the check valve that delivers fuel to the pump is stuck open which would not allow pressure to develop in the pump to squirt out the fuel.

When I service Webers I rebuild these check valves and install new check balls since they tend to be a little unreliable, especially if old and unused for awhile.

To check for fuel in the float bowls just open up the drain bolt on the float bowl between cylinders 1 and 2 to see if fuel comes out. If fuel comes out then you probably have a faulty check valve.

By the way, all fuel needle valves need to be shimmed to achieve correct float level, just sticking a washer beneath it is nothing close to being right.

Give me ring so I can help if you like.

[D.Ehinger]

Note to self. If you remove the float bowls for cleaning, don't re-install them up-side-down. Duh

[edmayo]

Since you can't assemble the bowls upside down I'll assume you meant the floats themselves,,,

[D.Ehinger]

Well yes. The floats. At least I'm now getting fuel. Doesn't run any better. Need to go back to the beginning. Check that valves are adjusted correctly and that the timing is set. I'm really new to this, and to this type of mechanical stuff. It does have a permatune installed. I think I'm going to call in for some help.

[Irish911]

Yes, make sure the timing and the dwell are set correctly before you try and tune the carbs. Otherwise you will be banging your head against a tree. Also if you played around with the linkage (unscrewed and changed the lengths) when you were cleaning everything, make sure you have reset them to the correct lengths when you reinstalled.