where is the tee valve? i don't know where the thermostat housing is either I'm really new to diesels

 

The thermostat housing is where the top rad hose connects to the engine.
There should be a brass tap located near the frt passenger side of the engine close to the fan belt up high.

That is the T valve.

 

I don't see a brass anything. What does it look like? How big is it?

 

It is not very large.
Here is an offsite link with a picture,valve is beside the green screwdriver handle:
Pictures: Water Drain Valve T-Handle - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

Opened the valve while running and it kept running

---AutoMerged DoublePost---

All i did was take the valve off while it was idleing and it kept running. Dont know if i was supposed to do anything more to the valve

 

Did fuel come out of the hose connected to the valve when you opened the tap?

 

no hose came out, could it have dropped down? if there is no hose could i just hook one onto it?

 

Hose is not required-more concerned about fuel flow?

 

Fuel did not come out of the valve no

---AutoMerged DoublePost---

I'm thinking the pmd might have failed, the people before me put a new one in a year or so ago and said they mounted it in the air intake housing or air cleaning housing ( don't know if thats a good spot) is there any way to test the pmd other then getting a new pmd?

 

With the engine running fuel should have come out the valve when you opened it-if no fuel came out and the engine stalled then the LP is not working.
Diagnose the inoperable lift pump first.

If the engine runs then the PMD is not yet suspect.