P0453 FTP HIGH truck has a fuel cell all EVAP remAins

We checked for continuity from PCM to bulkhead, then bulkhead to sensor=ok
We also did the various checks on the PCM Pins and the Sensor
lFTP V PID. If PID voltage was 4.9

We did all the checks here:

"33) DTC P0453: Check FTP Sensor Voltage Turn ignition on. Using scan tool, select FTP V PID. If PID voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, fault is intermittent. Go to step 42). 34) Check For Short To Power Turn ignition off. Disconnect FTP sensor connector, located on top of fuel tank. Turn ignition on. Measure voltage between FTP terminal at FTP sensor wiring harness connector and negative battery terminal. If voltage is 10.5 volts or less, go to step 36). If voltage is more than 10.5 volts, go to next step. 35) Check FTP Circuit For Short To VPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 62 and 103 at breakout box. If voltage is more than 10.5 volts, repair short circuit. If voltage is 10.5 volts or less, replace PCM. 36) Check Opposite Induced Low FTP Signal Turn ignition off. Connect a jumper wire between SIG RTN and FTP terminals at FTP sensor wiring harness connector. Turn ignition on. If scan tool communication link error is displayed, remove jumper wire and go to step 41). Using scan tool, select FTP V PID. If PID voltage is less than.1 volt, remove jumper wire and go to next step. If PID voltage is.1 volt or more, unable to induce opposite signal. Go to step 39). 37) Check Voltage At FTP Sensor Connector Measure voltage between VREF and SIG RTN terminals at FTP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF voltage is out of range. Go to CIRCUIT TEST C. 38) Check For Short Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 62 and 90 at breakout box. If resistance is more than 10,000 ohms, replace FTP sensor. If resistance is 10,000 ohms or less, repair FTP circuit short to VREF circuit. 39) Check For Open FTP Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 62 at breakout box and FTP terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FTP circuit. 40) Check For Open SIG RTN Circuit Measure resistance between test pin No. 91 at breakout box and SIG RTN terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit. 41) Check FTP Circuit For Short To VREF Circuit Measure resistance between test pins No. 62 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair FTP circuit short to VREF circuit. 42) Check For Intermittent Open Or Short To Power Turn ignition on. Using scan tool, select FTP V PID. Observe FTP V PID for indication of fault while shaking and bending FTP sensor wiring harness and connector. A fault will be indicated by a sudden change in FTP V PID voltage. Tap lightly on sides of FTP sensor to simulate road shock. DO NOT tap on top of sensor. If fault is indicated, isolate fault and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 42) to step 44). No test procedures have been omitted"

Since the only next step is to replace the PCU., That's a pricey alternative to re-routing the hoses and moving the sensor to the proper location.

I didn't do the disassembly of this area and two people at separate times reassembled the evap system. Not sure if they knew what they are doing.

A detailed diagram of all hoses and connectors in their spot for my year make and model would be awesome, but I can't seem to find one, all the diagrams I've seen vary slightly from the actuals of my 50 state legal system

All the voltages were within tollerance.
I'll have to find the sheet of paper that I kept notes on to update.
I guess the placement of the FTP doesn't matter too much?
Attached should give you a rough idea of placement

FTP Voltage, VPID was 5v (4.9). Within spec
Ref Volt was less than 10.5 at 5v
FTP SHort to PWR was 5.2v. In spec
FTP Circuit short to VPWR was less than 10.5 at 5v. In spec
Open SIG RTN circuit between PCM and FTP Harness was.3ohm. In spec.

I went to the yard this weekend to see about picking up an used FTP to test, and also get the Vent valve at the rear of the tank, as well as verify hose routing. However, there were only pre 01 trucks with the non-return style system so I couldn't compaire.

Can someone verify the path of each hose to component? IE, vent valve->hose to "T1", Fuel Pump vent->hose to "T1", 'T1" ->hose to canister. Ect or whatever makes since to explain.

Considering I am not using a stock tank, but a fuel cell with stock pump, and a hose instead of the the seperate vent valve,

I know, custome isn't many of your expertise, however, I thought someone might know more than the Workshop Manual tells you to do. Like your FTP needs to be here in line with this hose. Your getting that error becuase the fuel cell doens't. Blah blah blah.

But this one is a little challenging and out of the norm so I understand.

I have some other interesting issues, but I'll keep those for a rainy day:)

Thanks for your help, I have broused the site and learned some things I didn't know. The team is knoweledgable and the site definatly has helpped me in other ways

So know body knows custom installs in Cali that can guide me through this?
I'm sure it's not the wires or the sensor, I've determined it's the hose routing, but I can't find anything detailed enough to show me how/where to route