Hi I have a Toyota avensis with 1azfse motor ,overhauled it and replaced absolutely everything including injectors,now it overfuels so much that the oil smells of petrol

SOURCE: toyota 2e engine

Hi,

The only positive way to check if the oil pump is working and therefore there is correct oil pressure is to temporary install a non-electrical oil pressure gauge that uses a small copper tubing to sample the oil/pressure and drive a needle on the gauge. Depending on temperature, idle should register about 20+psi. Having done this and confirmed that indeed there is sufficient oil pressure then it may simply be a defective oil sending unit. Otherwise, no or low oil pressure at idle is an indicator that the engine needs to be opened up again.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

SOURCE: petrol in engine oil mazda mx5

have a compression check done

SOURCE: toyota previa petrol smell

I had similar problem some months ago it turned out to be the pipe under wheel arch (corroded) where cap filler is.
my problem was solved by replacing pipe which is connected to rubber pipe fixed to tank and filler hose from filler cap.
tools neede llong large cross head screwdriver, small socket set ( 12 mm , 13mm , 14mm) 150 mm extension bar. to remove bracket bolts
possibly some new pipe clips as others may be corroded.
you will need to jack up car and remove wheel to gain access.
took me about 1 hr, somebody with competent DIY skills should be able to deal in couple of hrs
check with dealer as there are two different pipes on different models one is longer.
my one was the one with the piggybacked overflow pipe.
small hands are advantage
Ian

SOURCE: how do you change the oil filter of a toyota

It might be internal filter which is front of oil pan which is towards front of car

SOURCE: Toyota Avensis T99

replace the thermostat its stuck open