What makes the digital fuel guage changes bars eg from 2 to 4 bars before refueling?

If your 3sfse is starting and failing to run yes its either the fuel pressure sensor located on common rail on your left side facing the engine slightly behind the inlet manifold written D4

fuel filter fuel pump

these Direct injection engines do carbon up the inlet ports
inlet manifold off to clean the ports

69. 1999 Toyota Nadia 3S-FE D4 Diract injection engine - AECS

www.aecs.net/techniek2009/badinjection.pdf

1. Oil level rise in the crank case because the D4 pump will be leaking petrol into the engine thereby cause high fuel consumption
2. Car stalls when hot, only starts after cooling
3. Car miss fires, loses power due to insufficient fuel pressure in the fuel rail

The only thing that let's fuel into oil is when your cooling system malfunctions it will make the D4 pump seal to be hard and cause it to crack.making the car run out of fuel can cause the D4 to malfunction.do not add injector cleaner in to your petrol on car with D4 pumps it opens 4th he nozzles so they end up dribbling that produces a black smoke

run the fault codes and look for faulty sensors or ignition module.

my gosh fix what.
post SYMPOTOMs
the ask for wild guessing? you get mostly the here $$$$$$
or ask for tests, called DIAGNOSIS?


gue$$ or tests. your call.

Check you regional library system for haynes or any other type of service manual......This is something you'll need a real resource for.....

The D4 pump has a seal and it cooled by the fan which it faces so if your car is not putting fans in the seal collapses and starts to drop large quantities of petrol into oil you can check every morning your oil level to notice the defect