Toyota 4Y carburater problem float chamber drains over night

Question edited for clarity, add maker.
Question moved from Office Equipment category.

Same carburetor does all 4 Toyota Engines.

https://www.google.com/search?q=1Y%2C+2Y%2C+3Y+and+4Y+carburetors

..

4y means 2004 year>? NO, no year told 4y is 1987 engine. carb
or 4yE, ecu EFI fuel injected engine 1997?????
NO CAR told at all , why skip that and sold to what COUNTRY?
the word is STALLS, means engine stop running and goes to 0 RPM/ stalls.
there are a huge lists of causes. and more tests.
it'll go off on it's own
means stall on it's own. use the word stalls, and it is way more clear.
engines are not light switches (on/off) so be clear.
fails hot or cold engine not told
my guess hot.(hot means normal temps.) if overheating many modern car (PCM brain) shuts off the engine to save it from damage. or drops cylinders like my 2004 chevy does.
I will make the the short list. (called a macro list)

1. engine bad, (ever tuned up ever (serviced) or cam belt slipped.
2. bad spark , top cause not turned up. means spark parts replaced and fall filters.
3. bad fueling, too much floods or too little fuel it starves and stalls.

there a bunch of tests, using skills and meters and tools to find the 3 causes. (a micro list I refuse to post here, a wall of endless text)

the answer is take it to a shop and get it fixed.
like 99. do today, most do. lacking tools or skills.

on big clue, is: for STALLS
IS
was the stall and instant and or violent stall? (spark common type)
or the stall was slow but smooth, stall. (fuel lost)
If I was driving I'd know that in seconds flat, and know what to do.

this is a USA answer and is not the 4YE answer.
4Y has a carb so carb is bad, too if spark and engine are ok.
like chock stuck on or carb float levels failing or carb needs full cleaning as most do and frequent. filters packed up>?

Go to the link please. http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c15280081526

FYI

http://motorpower.net/specs/4y.html

images for Timing on a 4y motor toyota forklift

Timing Chain And Sprockets, Cover And Seal - AutoZone

www.autozone.com/.../Toyota.../Engine.../Timing.../_/P-0900c...

AutoZoneToyota Cressida and Van 1983-1990. REMOVAL & ... 1 Exploded view of the timingcover assembly-3Y-EC and 4Y-EC engines. Click image to see an enlarged ...

How do you set the timing for a toyota 4y engine - Fixya

www.fixya.com/cars/t9616067-set_timing_toyota_4y_engine

Jun 29, 2011 - Posted on Jun 29, 2011.

You will be needing the specifications for a 4Y Toyota engine will be found in the workshop manual for a Toyota high lux that has the same engine in it.

Most likely the carburetor needs cleaning - if flooded the fuel chamber wasn't closed properly and excess amounts of fuel came in. A tiny grain of sand or similar can cause this. When cleaned the fuel filter should be replaced also.

Try going up to the auto parts store and getting your alternator checked.

When A/c is turned on the idle up actuator is activated which is connected to the carburetor shaft which connects to the secondary throttle. If secondary throttle is adjusted to much so as the butterfly valve opens to wide more fuel will enter the engine. Check fuel float in the carburetor float chamber , if it is adjusted to high. Readjust for proper level, to do this invert the carburetor cover with the float connected, the float should be horizontal in position with regards to the cover of the carburetor. To high a float would cause fuel to seep in the carburetor chamber and into the engine.