Also here are some pictures of my float in case anything sticks out to anyone. This front float has definitely seen better days. 
 

 

 

14 minutes ago, rcv said:

 

@siteunseen I just read through your linked post, and I think I get it. You’re using an electric fuel pump to push fuel through the float while it sits on a glass. Then you just measure the fuel level in the glass when it stops, right? I’m I reading the FSM right when it says the fuel level should be 23mm from the roof of the lid? I don’t have an electric pump, but any reason it wouldn’t work if I pull off my mechanical pump and actuate it manually?

Yes. I scratched a line in a glass jar that was 23mm from the lid's roof then hooked up an old pump and got them dead on. Never looked back, they have been rock solid for 4 years now????

The jar was one of these from my grocery store.

This one looks good (kinda high though IMHO). The other one you could get some needle nosed pliers and try to straighten it up. I don't think you can buy the floats anymore???

Here's a pretty neat way from @Richard McDonel.

https://www.classiczcars.com/forums/topic/62557-float-bowl-overflow/?do=findComment&comment=580586

 

If you have any 1/4 drive sockets you can fit one under the tang and use it to bend the natural hump back in. If you don't have a socket you'll think of something that will work.

Under the tang in the red circle.

Well, no Hormel Dried Beef at the grocery store, but I did find a nice straight glass and a big flat trivet that can live in the garage. 

Just to be clear on the measurements, 23mm is from the roof of the bowl lid right? That lid is recessed by 3mm, plus I have a 1.5mm piece of plastic it’s sitting in, so I’ll need fuel at 23 - 3 - 1.5 = 18.5mm below the top of my glass right?

Math escapes me on Sundays, my only off day sort of, my shortest work day. But it sounds like you have it.

I got lucky with that jar. It's barely larger than the float chamber.

And yes from the roof. This picture is dissceiving.

 

Edited October 11, 20204 yr by siteunseen

Speaking of math escaping us, I may have inhaled too much of these gasoline fumes. 

Does the diameter of my measuring vessel matter? My cup is around 80mm wide, but it shouldn’t matter as long as I’m filling slow and steady right? Archimedes is rolling in his grave right now. 
 

I’ve got my tab bent really damned low and  I’ve finally gotten to my 18.5 mark, but the float is pretty much topped out against the lid. Doesn’t seem right at all, and worries me that any minor variation and I’ll start spewing gasoline out of my bowls. 
 

Is that water or gas? Seems like i read it makes a difference but DANG! thats way off from mine. I have know idea Sir, sorry. It should sit level in my opinion. Another thought. Maybe your glass is so much wider allowing it to do that? The float chambers might keep it level because of their smaller diameter. You need some dried beef!

 

 

 

 

I just noticed you don't have the needle valves like I have. Are those the original ones from 100 years ago? I don't think they are. OE Nissan has a rounded tip. Your's are squared off. Maybe they were from a closed Z supplier now, Black Dragon? They sold rebuild kits.

Yup it’s gas. I tried my old floats/valves/lid combos from my original carbs and got the same basic results. I’m beginning to think maybe my adjustment factor is off?

These are 4-screw carbs if that makes any difference. 

I found a thread with the different valves and something I totally forgot about. '72s have different length mounting ears for the floats. Fronts are longer or deeper to make up for sloshing back on acceleration. You have to use multipile washers on the front valve. They call it stacking.