Mystery Vacuum Port - What is it?

[dodored]

I am working on a 1972 FJ40 and found a vacuum switch on the intake manifold but have no clue as to what is does. Can anyone help identify this part? Also, if the Aisan carburetor is such a good choice for the FJ40s why are there so many that have been changed out? Why, back in the day, would anyone think a Rochester was a better option than the OEM Aisan?
Thanks MUD

 

[Coolerman]

Maybe they just used that to plug the hole. I have never seen a 1972 FJ40 with a vacuum switch.

 

[surfpig]

If I recall that's where the "gas filter" goes. At least in later models. It's just a vacuum port to operate some of the carburetor/emissions functions. Depending on the year, there might have been one, two or three vacuum ports on it.

 

[Solace in Solitude]

^correct^

 

[dodored]

What about the trend of replacing the Aisan carbs for aftermarket - Why?

 

[ToyotaMatt]

What about the trend of replacing the Aisan carbs for aftermarket - Why?

Like u just said it's a " Trend "

@65swb45 can rebuild Yours

or

@Racer65 Sells a New OEM Toyota Carburetor AISIN 2F

he occasionaly has F engine ones in his Unicorn section

 

[dodored]

Like u just said it's a " Trend "

@65swb45 can rebuild Yours

or

@Racer65 Sells a New OEM Toyota Carburetor AISIN 2F

he occasionaly has F engine ones in his Unicorn section

Do you feel that in retrospect the Aisan is a superior carburetor for the FJ40? I am speaking in terms of off road capabilities i.e. resistance to fuel starvation when the truck is at a severe angle or a lack of open ports that can suck in dust.

 

[ToyotaMatt]

Do you feel that in retrospect the Aisan is a superior carburetor for the FJ40? I am speaking in terms of off road capabilities i.e. resistance to fuel starvation when the truck is at a severe angle or a lack of open ports that can suck in dust.

Absolutely !

 

[John McVicker]

What about the trend of replacing the Aisan carbs for aftermarket - Why?

Back in the day...late 70's to early 80's, Man a Fre pushed real hard on their set up which included the Rochester carb, a Delco distributer and a Jacobs Energy System (coil). They pushed this stuff hard. I fell for the complete kit. It wasn't really bad, but certainly not any better.

The bad thing was the Rochester and the Delco stuff were used & already old, especially the distributer. In the long run everything was more problematic. Took a while to come to our senses, but eventually everyone wised up to the benifits of true OEM equipment.

 

[dodored]

Good to learn from previous experience. Thanks for the real world insight.