Need some advise for fuel system issue

Hey everyone
My 2011 with just over 200k quit on me last week and of course, we were 100 miles away from home as well. The shop has had it since Saturday we had both thought it was the fuel pump but after testing, they said it was working it was just not getting power. Thye said there was 11 volts coming from the computer and they even tried replacing the ECM that was on the frame rail. I got a message last night that the ECM did not help.

Does anyone have any thoughts please? The truck will turnover just fine it is just not getting fuel or turn on the pump on. I am getting very nervous and need my vehicle for work.

Thanks.

 

Hey @Jon1979 can you give more details on how this is being checked? what all troubleshooting steps did the shop take? Are you even sure its the fuel pump? cause the infamous Toyota immobilizer can act the same where the truck will not start. A little bit more details may get you help in figuring this out.

 

Yeah, it started with the truck just stalled out on me on the road. It would crank over fine just not start. The shop checked the fuses and relay and at first thought it might be the pump. After taking the take down they were able to jump the pump and it worked fine. That was when they started to check to see where there was power or not. They said the harness looked good on the pump and they were reading 11 volts coming from the computer. They did find that there was no voltage coming from the ECM but after getting a new one the truck still won't start. My truck is 100miles away in VT while I am here in NY, so it sucks. It is at a local VIP shop and not a dealer. I am not sure if they checked anything with the immobilizer, but I can ask when I speak with them around noon.

 

Sorry to hear about your truck troubles. Is the battery good? These trucks are sensitive to low voltage from fading or faulty batteries, I guess most modern vehicles are. The battery can be the problem, the connections and cables can be the problem. Bad grounds, corrosion in cables or at connection points can cause low voltage issues. You live in a high corrosion area, so I would be suspicious of the cables and connections. All good batteries die in the winter also. Unless you live in Arizona.

 

The battery was new last summer. I would hope a shop would check that, but everything else was getting power. The pump just will not turn on. I am not familiar with how the immobilizer works but I can ask if that was checked.

 

If you are in the north (for sure) or south (doesn't matter). It would be beneficial checking the grounding as @KNABORES suggested. I think they are located one right next to the battery and a few other points of which I am not aware, but It would be great if some other member can chime in on the other grounding locations for the 5.7l. As I am sure there may be other ground points for different engines types.

 

Hey check this video out as well. might be something you want to check out.

https://www.youtube.com/watch?v=gAgiLouV_00

 

Thanks for the video baraynavab. My truck will still crank over just fine it is just not getting fuel to run.

 

When you say ECM I assume you mean Fuel Pump ECU on the frame rail? As in no voltage coming out of the Fuel Pump ECU to the pump? I assumed they verified the Fuel Pump ECU is getting power?

 

Yes, they tried a new Fuel pump computer that was on the frame and that didn't help. I am assuming that they checked for voltage coming into the unit.
I still have not heard from them if they have found the issue.

 

First thing I would do is make sure power is getting to the fuel pump ecu. It comes in through a series of fuses and relays. I believe the power comes into the fuel pump ecu and the engine ecu just controls (via the fuel pump ecu) how it is sent to the actual pump. Long story short having no power to the fuel pump ecu means no power to the pump.

The engine ECU just send signals to the fuel pump ecu to tell it to come on/off.

If you have power to the fuel pump ecu, your problem is the engine ecu not sending the proper signal to the fuel pump ecu/pump.

IF you put the key in the ignition and turn it to on, watch the red security light on the dash. If it goes off completely and stays off the truck is properly recognizing your key. If the security light is staying on or flashing you could have a problem with the key recognition which would cause the engine ecu to not turn on the pump.

 

So one of my key for the tundra is a little woonkey. i.e. I got it off Amazon for a lot less than the toyo key. Anyways when I use that key I make sure the immobilizer light goes out to make sure its starts. This key sometimes probably does not get the transponder chip close enough to turn off the immobilizer.

Additionally, I believe there is an immobilizer ECU as well.. not saying it is this but may want to check into that as well..

 

What light is the immobilizer light? I'm having this same issue mine didn't quit on me it was running fine when I parked Sunday night
Monday morning when I went to leave for work all I got was crank no fire I was able to get it to fire on starting fluid so I assume this confirms a fuel problem

 

Just to the right of the clock

 

TY

 

Really good info here I just found with google fu. I'm facing a similar situation except I'm attempting to diag my crank no start myself.

 

What ended up being your issue? I had the exact same problems you stated Toyota is saying the fuel pumps shot, funny thing is the fuel pump was installed 10/7/2021..

 

Any update
Having same issue, crank no start, no fuel.

 

Same problem in a 2013 sequoia. Haven’t solved it yet.

 

I have a 2011 Tundra with about 150k miles. Just started having a similar problem. Went to leave my house a few weeks ago and started my truck. Got out to do something and before I got back in the truck shut off. It would start but after a few seconds shut off. I thought maybe I got bad gas so put some gas treatment in it but didn't try to start it up until a couple days later because I was away. Before I started it up again, I had disconnected the battery and cleaned the terminals and cables. When I started the truck, it idled poorly but ran. Then after a short while, the truck started idling and running great. It ran for about 500 miles and then the same problem and that's where I'm at now. The truck does not have the flex fuel engine but both times this happened was shortly after filling up. I can hear the fuel pump kick in when I turn the key on and it starts but then shuts off. I know just enough about vehicles to be dangerous but I was wondering if it could be that the computer turns the pump on for starting up (I think this is for 2 seconds) but doesn't turn it on once the truck is running?