I have searched high and low, and have found answers varing from 7/64" to 1/8" to 5/32". The hose that I need to replace is one that tore when I removed it. The metal vacuum tubes to which it connects is just under 5/32" diameter (it will not quite go thru the 5/32" hole of my drill gauge). Logic tells me the ID of the hose should be slightly smaller than the metal tube to which it connects, so 1/8"? Or 7/64" per the company that the company just just rebuilt the carb?


Passenger side, vacuum connection in question is lower right of four on this side (all look to be same size)

 

Inner diameter is approximately 3mm, outer approximately 7.5 mm. I'll leave the conversion to standard to you. You'll use the same line for all connections. I bought aftermarket vacuum line years ago. At first it fit snug, then after about 6 months it would fall off just by brushing against it. I then bought vacuum line from Toyota. You don't want vacuum leaks.

Here's a link to the parts diagram for vacuum piping. Page 1 lists Toyota part numbers you can use to order a certain length. I called the parts dept to order a total of 13 feet (or maybe it was 15 feet) to do all my lines. Pages 2 and on, show specific vacuum lines with the lengths needed.

https://japan-parts.eu/toyota/us/198...acuum-piping/1

You can use that link to change to your year/model/etc. Click the box with year to select different year...

Who did the rebuild for you? It looks great.

 

Thanks for the size. I'll get a short length of 1/8" ID to replace the one hose that tore. If I decide to replace all hoses, I'll look into getting from Toyota.

Rebuild was done by Guaranteed Carburetors located in Largo, FL. They were the only other company that I could find that did work "nationally", and were about $100 less than National Carburetors, also located in FL. We'll see how good of a job they did after I get it put back on the truck. So far, I've been underimpressed with their communication skills, but if it functions as good as it looks, I will be pleased. One hiccup so far has been one of the gaskets to go beneath the phenolic spacer did not have a "U" shaped cutout, so I have made my own. For more about the gaskets, I started another thread with questions.