12.7 questions

Not sure if your familiar with equiflow tanks on mostly all freightliner and westernstar trucks. Pickup and return off bottom of tanks.

if return wasn't off the bottom all you would do then is blow air back into the tank that's not getting pressurized.
Reguardless it wouldn't work...

I feel like we are beating a dead horse here as it's not the OP problem anyway.

 

We aren’t beating a dead horse as someone may learn something. That may come in handy another time. On a Kenworth the return fitting is on the top of the tank. That fitting has a 6” x 1/2” piece of curved aluminum pipe that is flared on one end. Why Kenworth does this rather than simply let the fuel drop into the tank is beyond me. Simply put a Kenworth draws fro the top of each tank and returns by dropping fuel into the tank at the top (far above the fuel level). That is why putting shop air in through the vent will push fuel through the engine and purge the system of air. Believe me Ride and Repair know what we are talking about. I can’t do a drawing on here but if I could I would give you a pictorial illustration that I think you would follow what we are saying.

Keep an open mind. It is a path to learning more.

You say it can’t work. I say it will. I’ve got a Benjamin Franklin that says it can work, will work, and does work.

Keep us posted.

Dan
bgsexp@gmail.com or pm me

 

I'm not going to argue with you.

It's simple physics. You cant argue with that.
If you put 5psi through the vent in your tank you will have 5si of positive pressure pushing fuel to the engine. You will also have the same pressure pushing up the return line to the engine.

How the heck is fuel going to go through the engine and back to the tanks through the return if you have the same positive presuure in the return. I dont really know why this is so hard to understand.

Put a 100 psi in the tank and fuel isnt moving anywhere on a closed loop system. ( figure of speach, dont put 100 psi in your tank please).

The only time you will achieve what your aiming for is if you disconnect the return at the tank and vent to atmosphere. Then and only then will you purge the engine of air and fill it with fuel. Its Called flow.

I'm done muttering up this thread any further. Maybe start a new one on priming a fuel starved engine . Idk.

 

Dont forget about the wires going to both trs /srs sensors. Those are the only sensors that will cause a crank no start condition. Seeing as you have both check /stop lights at key on ,I dont think its power related to ecm but wont hurt to check anyway. So focus on wiring from ecm to those 2 sensors. Check wires going into plugs also. Good luck

 

I cant remember , did you try another ecm? If your certain all wiring related to ecm and those sensors is good it very well could be the ECM itself. Do you have access to a known good working ECM you can borrow just for testing purposes.