2010 Yaris cranks but does not start

[Rob888]

My 2010 3 door hatchback Yaris cranks but does not start. It has 140k miles.
It died suddenly while I was driving as if it ran out of gas and would not start again.

I sprayed starting fluid into the hose that connects to the throttle body for one second, and the engine ran for a few seconds. So the problem is not a spark problem. I replaced all four spark plugs before doing the starting fluid test because when I've had this same engine problem in the past it was
the result of a bad spark plug. Changing the spark plugs made no difference.

When I turn the key to the "On" position I do not hear a humming noise from the rear of the car where the fuel pump is located, but I do hear a humming noise after turning the engine over trying to start it. Should there be a humming sound each time the key is put into the "On" position?

I do hear clicking from the fuse box under the steering wheel when I put the key to the "On" position. So that means the fuel pump relay is working, correct?

There is no fuse in either fuse box either in the engine compartment or beneath the steering wheel that is clearly labeled for the fuel pump. So I checked all the fuses, and they all appear to be good. I slid my voltmeter probes into some of the fuse slots and got close to 12 volt readings on some but nothing on others. But I did not slide to probes all the way into the slots. So I could recheck to voltages again if necessary. My battery is good and cranks the engine strongly.

I checked the fuel injectors Ohms readings, and they are all within spec. I don't have anyone to turn the engine over so I cannot listen for the clicking sound in the fuel injectors.

There's no bolt on the fuel line to loosen to see if there is fuel pressure. So is there another part that can be loosened to check for fuel pressure?

My Yaris 2010 Factory Service Manual shows that a fuel pressure gauge needs to be connected with a SST "T" connector and a SST connector at the fuel pressure gauge hose. Is this the only way to connect a fuel pressure gauge to this car?

I looked under the car and could not find the fuel pump electrical plug connector. Is the plug next to the fuel pump underneath the back seat?

I cranked the engine with the MAF sensor disconnected, but it would not start.

I checked the air filter and its hose and they are clean.

Thanks for any replies.