Addit - Will relocate these posts to appropriate topic
For tub style, the fuel filler breather only works when filling up. It doesn't breathe when the cap is on.
What was your filler neck breather blocked with? Highly likely the fuel pickup will be blocked too if the filler was blocked
The tank breather needs to let air in when fuel is being consumed or it will collapse like the image that TOYZX posted in the link above.
The tank breather line lies on top of the tank in a recess channel at the end of about 1 foot of fuel hose.
The tank end can be seen from the left wheel arch. You will need to get access under the car between the drive shaft. Feel for the breather valve on top of the tank just above the heat shield. Once located you can pull it up by hand as it is only press fitted to the tank with a square locating plug (see addit below).
I will find some images and post here later
Old Images added:
This gives you an idea where it is.
Easy with the tub/tray off but still reachable when on.
Tub on. The terminating end sits out of the recess on top of the tank under the rear of the cab.
Tub off. Breather line pulled backward. Toyed with the idea of attaching breather elevated to the back of he cab.
Front of vehicle is on the right side (back of cab is white - right corner of image)
The breather line goes to the front under the cab - tank recess can be seen in the right lower corner under the cab
You can see the square locator is part of the valve cover. Press the hose spring clip together and pull the entire valve assembly off. Block hose end while inspecting/cleaning the valve. Carefully remove valve cover. Note direction of valve for reassembly and blow out in the direction of exit from tank.
Addit - memory is clearly fuzzy after 5+ years
Had a look under my partners car and inspected valve.
The valve cover also has a small round ball - this clips into the top of the tank.
I pulled a friends breather valve a few years ago from a Prado on the CSR that was blocked. The square locator is used for the prado - same valve.
You will need to pull the hose clip down about 35mm then initially lever the valve off the breather hose with a flat head screw driver to get it moving.
Tricky to get the valve out - 2 one-way retainers hold the valve in. Push the opposite sides of the valve cover in with fingers and pull vlave out. You may need to use a small flat head screwdriver to push the retainers in with a 3rd hand
A bit of debris fell out from the end of the cover.
The valve will only go in one way but marked the distal end as a visual reminder to blow out that direction
Squirted a bit of MAF cleaner into the valve. Wasnt blocked but some crud came out.
Blowing out by mouth was enough but may not be if blocked.
Push valve back into cover once clean and dry
A little tricky to locate the little plug hole on top of the tank to push the valve cover ball back into but use fingers to find the hole and direct the ball into it.
About 15 minutes all up - most of this time was trying to get valve apart without destroying it.
A bit of preventative maintenance well worth the 15 minutes