Okay, got the Weber 32/36 kit today, and have some questions. There's only ONE vacuum fitting on the carb, so which one of the myriad of hoses on the stock Mikuni wins the lottery and gets attached? Please be VERY specific as to which hose gets attached - don't refer me to a diagram or hose color, but specific routing - the Weber instructions say "original distributor vacuum advance hose to the vacuum advance port". Which leads to the next question, and that's what am I supposed to do with all the hoses that are left? Trace them to their source and cap them, cap them where they terminate, disconnect them from the stock Mikuini and leave as is, or?

Also, there's only one fuel inlet, so do I just remove the fuel return hose at the fuel pump and cap it? And what about the water hose? There's no fitting on the Weber for the water hose to attach, so what do I do with that hose, just put a bolt in the end with a clamp, try to block it at the source, or? There's also these two rather large threaded aluminum bolts-looking things, which I have no idea what they're for.

Any help would be most appreciated! I'm anxious to get this Weber installed, and see what it drives like with a fully functioning 2-barrel carb. This Weber appears to have a mechanical secondary, so that should make it pretty failsafe, compared to the vacuum secondaries on the Mikuni.

well from what I remember on mine you need The vac advance from the distributor hooked up there.. I never used any of the other crap I just pulled it out. Hope this helps. <img src="/forums/images/graemlins/smile.gif" alt="" />

Yep, water hose...put in bolt and clamp it. One Weber vac port to distributor advance. Take picture of entire assembly before unceremoniously removing all other vac lines in case you ever want to put it back in. ALL of the rest of them go away. I believe you will also be disabling the EGR, if equipped, but someone else may chime in on that.

The secondary air system will be hanging in the breeze with nowhere to connect the hose that used to go to the air cleaner. FastEddy has a solution for that involving unbolting a part of the hard pipe and inserting a quarter. I've never tried that, so hopefully he will chime in here.

You may have to modify your throttle cable.

One of the fuel lines from the fuel pump to the carb will need to be capped, IIRC. The return line coming from the pump still runs back to the tank, again, IIRC.

John B.

Thanks guys, that helps. There is a hose that comes off the distributor, goes into a "T" fitting, and one branch goes to the tri-plug that goes into the carb base, and the other branch goes to the other side of the carb and connects to something. Guess it doesn't matter which hose I use to connect to the Weber, as long as I cap the other one. There was a long section of thin hose that came with the kit, and my guess is this is the vacuum hose that goes from the carb to the distributor. There's also a section of hose that looks to be fuel line, so I'll have some extra in case the stock fuel hose will be too short, which I think it will be, since the fuel inlet on the Weber is in a different location.

I'm tempted to just disconnect all those hoses on the stock Mikuni and leave them there, and put bolts/clamps in the ends of the water hose and fuel return hose. That way, the "original" hoses will still be there, more or less in their original location. But I'm also thinking that can't be a good thing, to leave all those hose ends open like that? When I noticed the Weber only had one vacuum hose fitting, it's no wonder it's not street legal in CA. There's probably no way it'd pass smog.

But I'm really liking those Weber mechanical secondaries! Looks like I'll tackle the install either Fri or Sat, so wish me luck!

Just run the new single vac line from the carb to the distributor. Dump the tee. Seroiusly, you can take everything that all those vac lines hooked up to completely out, but that's why I suggested taking pictures.

Still not completely sure about the fuel lines, but again, the return line stays connected. Not remembering what the function of the two lines running to the carb are or why there are 2. Is one a second return, running from the Mikuni? Don't know.

John B.

The fuel pump has one inlet and two outlets. One outlet (regulated pressure) goes to the float bowl. The second outlet (regulator bypass) goes to the accel pump well, and then to the tank fuel return line. For the Weber, the regulated pressure may need to go to a second lower pressure set regulator, then to the weber float bowl. The other outlet is plumbed to the fuel return line.

Looks like the stock fuel pump has three hoses attached to it. I'm figuring one is the fuel inlet from the fuel filter/tank, one is fuel TO the stock Mikuni, and the other is fuel FROM the Mikuni? My plan is to connect the "TO" hose to the Weber, and either bolt/clamp the end of the other one (return?), or remove the hose at the pump and cap it there.

Also, BIG thing I forgot, was the carb wiring harness. The Weber has an electric choke like the Mikuni, so what's the easiest way to do this? Unplug the Mikuni harness and connect a wire from the car harness to the Weber? Or leave the harness plugged in, cut the wires about 6 inches from the Mikuni, figure out which wire is for the Mikuni electric choke, splice into that wire for the Weber choke, and wrap the ends of the other wires?

So is there any harm in just unplugging all those vacuum lines and just leaving them there, and running that new one from the Weber to the distributor, and plugging the water and fuel return hoses with a bolt/clamp? For now, that's my plan. If I need to trace those vacuum lines to where they terminate and cap them or something, I need to know, so I can go out and buy some rubber caps.

NO!

The fuel pump will overwhelm the needle valve in the carb and flood the engine with fuel. Read my post above again...

So if my Weber only has one fuel inlet, which one of the two fuel outlet hoses from the stock fuel pump gets connected, and what am I supposed to do with the other one?