*****PLEASE HELP diagnose****

so let’s see.... started with the fuel pump fuse then relay, then pump, nothing, did the plugs coil packs checked all my fuses about 5 thousand times. Went on to the crankshaft pos. Sensor nothing, camshaft position sensor nothing. Took the timing covers off cause it must have jumped timing or something right? I mean wtf
Else could it be.? Well the timing belt is rite on the money, maf sensor is fine .... why won’t this motherfucker start? Up till last week she ran like a fuckin raped ape.... now ......
Crickets...... somebody help a motherfuckinn honkey out sorry guys forgot to say that we’re dealing with a 06 tundra 4.7 v8

 

Whoa Nelly!!!

What was the original issue? Not starting? Why have you checked/replaced everything you listed?

 

I know what’s wrong with it, ain’t got no gas in it!

 

Its got almost a half a tank. And it started soon as I started it up to leave last week I backed out the driveway put it in drive and bam.... started to shake like it was running out of gas ( wich it was) but it died and ain’t started yet

 

Also it’s not getting no power to the fuel pump relay . I can run a jumper wire from the pos. Lead in the relay slot straight to the battery and I can hear the pump and
Hear the gas rushing to the motor

 

Have you checked all your wiring harnesses for any rodent damage?

 

Just throwing darts here - fuel filter?

 

Sorry, that was a joke I was making. Have you seen the videos of vehicles wrecked or not working and that audio is played?

But I guess it actually could have been your issue with what you gave us on first post.

 

This is a 2006 Tundra? This might something to check..

https://www.tundras.com/threads/cant-get-power-to-the-fuel-pump.87230/

 

Still nothing, cmon guys need ur help

 

I would start with as much background and detail as you can. Your original post isn't very informative. Even model and year help.

I would start the next post like it is the first post. Symptoms, What you have tried, why? - we will assume what you don't list hasn't been tried. I'm guessing you have no clue if the fuel filter is a problem, for example. Not that's a huge diagnosis, but it killed my truck once. Share more.

 

Codes? Vehicle doesn’t need to turn over to read past codes ya know, only turned to the accessory position.

 

It’s got no cel but the weird thing is is it did have the cel on rite before it took a crap on me to me it almost seems like it’s a computer or ecm issue cause when I do crank it it shows no rpm’s

 

Why would you see RPM'S while cranking?. Also, you said you had a CEL before it died, but you didn't say if you checked it for codes as others have asked.

 

That one's going to fly over a lot of peoples heads, but I LMAO when I read it. Bravo.

You mentioned wanting to swap ECU in the other thread, but before you do that, you should confirm the fuel system is working as intended, and you have spark to the plugs.

Understand: You need spark, air, and fuel to make ignition. At minimum, you need to verify you've got spark, and verify you've got fuel pressure. Before you start getting into "ECU bad ..." and whatever. Sure, ECU needs the MAF to work right so it can see how much air is coming in and adjust. Yes, it needs the throttle body assembly to work right, so it can actually open the throttle and let air in. But the two most important things to confirm are: Do you get spark? Do you get fuel (with ample pressure)?

Have you pulled a spark plug or two yet to see what condition they're in yet?
Have you confirmed fuel pressure yet?
Have you randomly tested the plugs are firing yet?

If I remember right, there are at least 3 components of the fuel system that can go bad which will stop the fuel pump from coming on and staying on:

• Fuel pump resistor - on older trucks, it's the silver finned thing on top of driver side fender, under master cylinder, on newer trucks, it's the silver finned thing on top of passenger side fender, next to the power steering reservoir
• Crankshaft Position sensor (not to be confused wthe camshaft sensor) - you said you already verified wiring and tested it, I think

Here's the fuel pump circuitry if you want to understand how the fuel system works.

Here's a link to some diagnostic videos that may help you figure out starting issues:
https://www.tundras.com/threads/2005-ac-wont-start-fuel-system-problem.113385/#post-2921783

Before you run yourself ragged, know the circuitry in these trucks only turns the fuel pump on on when (a) you're actually turning the key forward to start it and (b) when the ECU senses (via crankshaft position sensor) that the engine is running. You need to monitor fuel pump activity and fuel pressure during either A or B.

For spark, there are plenty of tools to test at your local auto parts store, but if you don't mind getting shocked, that's another easy way to test. And if you've EVER bought non-Denso, non-Aisin parts for this truck, OR you bought ignition/fuel parts from scAmazon or fleaBay, know both of them are notorious for selling counterfeits, especially spark-related stuff (plugs, coils). These trucks tend to not like non-OEM coil packs, as one or two folks who "upgraded" to MSD brand found out. (I love MSD; sad when I saw ppl had issues on the 2UZ)