Cat 3406 won't start

I’d say losing fuel prime, does it have the davco fuel filter, the little butterfly valve can turn a hair and cause it.

 

That is a davco style filter... It may be suckimg air past one of the o-rings. Take the bowl off and check the o-ring, if its not torn lightly lube it with clean oil and reassemble. Then fill it with fuel to top of cartrige, when you put the cap back on lube that o-ring aswell.

Ive had davco filters suck air like that before.

If doing that getts it to start let it run for an hour or 2 to make sure it will stay running and not still suck air.

Edit: oh never mind... I see that it is full so it's not sucking air.

 

E models don’t have a shutdown solenoid, the ecm simply quits firing the injectors to shut it off. Since fuel seems to be ruled out it is an electrical issue may be a timing sensor or wiring. May or may not be related to the washing.

Look at the other threads in the section this is posted you’ll find the wiring diagram for this engine.

 

If it starts on ether and stays running after I would guess loss of prime. There is a check valve on filter base on driver side of block that likes to go bad. Hard to imagine an emodel not having this filter on it but I have no clue. Good luck trucks that won't start are some of my least favorite ones.

 

Get it plugged in and see if the ECM is getting speed and engine position signal.