2000 tundra wont start

I have a 2000 tundra 4.7v8 that has 290k miles. Not had any issues until recently. Got the error code for the catalytic converter on bank 2. I figured it was time to replace them anyways and put in new ones with 4 new o2 sensors. Still wont start. It cranks but wont fire. Now this all started a month ago when the truck started fine in the morning, and 2 hours later wouldnt start. I left town for a week and came back and it started fine and i drove it for 2 more weeks. No issue. Until one day it just stopped starting again. Has not started since. Has had a new fuel filter in the last year or two. The truck cranks but doesnt even sputter.

 

If I had to guess, it’s probably the fuel pump in the tank. As someone mentioned before, you can probably hear it turn on near the near the gas filler. I can’t remember if they had the cap off.

Might be something else, but that’s something to check.

 

I have been trying to listen for it, but wasnt sure how audible they are on these trucks. Ill give that a shot. I know i have not heard it so ill check again

 

You’ll need a 2nd person since the pump only turns on when it’s cranking. It doesn’t turn on before then unfortunately.

Also, there’s plenty of threads here that talk about this topic. It isn’t uncommon.

 

Rodents love to chew wires and plastics on these trucks because of the soy content. If you park in a barn, or outdoors, or anywhere else rodents are known to scamper, first thing to do is look for chewed wires at the top of your tank, the fuel pump wiring, everything leading up to it. They love getting under the intake and chewing the knock sensor wires and starter wires too, but you're cranking, so that's not your issue.

You'll want to check for fuel pressure also. Know that the fuel pump DOES NOT turn on just because the key is in the ON position. It only engages when you crank the engine forward, and when the ECM detects from the crankshaft position sensor reports the engine is running. Find a way to check for pressure, if you don't have adequate pressure, there's your problem.

If there's nothing chewed back there, and you've got fuel pressure while cranking, OR the engine is able to fire up using starter fluid, you'll want to track down issues with the fuel circuit. (fuel filter is never a prob)

There are a number of components to the fuel system. In addition to the relays, the silver finned thing on top of the driver fender, below the brake booster is the fuel resistor. You can check it for impedance, though I don't remember the acceptable values, this will help out. @BubbaW posted that in another thread today. You should also be aware, the crankshaft position sensor (not to be confused with the camshaft position sensor) must be intact for the fuel pump to remain on after ignition. If you've done the timing belt recently, which is due every 9yr/90k miles, people often reinstall it wrong, and it gets nicked by pulley or belt, and worthless. Look from above and below at the front of the block to see if any wire looms are nicked or damaged. (link to sample)

I always recommend watching these two videos - while the content is not 100% accurate, it's a good baseline to troubleshoot without any of us folks having to type our fingers off for you, knowing most people coming here looking for help never return, nor bother to tell us if something worked or not.

https://www.youtube.com/watch?v=0jWouSQYTnU&feature=emb_title

https://www.youtube.com/watch?v=VoerlgT8pck


How to replace Crank Position Sensor if damaged, and you can see where it and its wiring are:

https://www.youtube.com/watch?v=3MPGlaBH3VI

 

Thats less than helpful! Ha! Guess its time to bring in the wife!

 

Ill be keeping everyone posted.

 

PS - the "started/won't start" makes me think failed fuel pump and/or fuel resistor is bad. But could also be crank position sensor is bad. Should be enough info above to kick us back more info, and we can help trace it out.

That fuel pump diagnostic video will show you how to direct-jump the fuel pump and not need a 2nd person around the 55sec mark

 

Give the tank a good thump on the bottom, near the middle, with a block of wood, rubber hammer, etc. That will often coax a dying few pump into working for a while longer.