The tank is full but not releasing air through the outlet hose

2 ways ..there should be a hidden hose outlet to fill the 106 gallon tank on outside.. have you checked near the gray water extraction location..
other way find the underbelly tanks and trace hoses till you find it..

Removing the Old Core

• Disconnect the Mercury Cougar's negative battery cable. Remove the center console from the interior. Disarm the car's air bag system and remove the bag's diagnostic monitor and bracket.
  

• Take the heater outlet floor duct out of the car. Remove the screw holding the air transfer duct and push it into the outlet duct. Unscrew the screws retaining the outlet duct to the heater core cover and release the retaining tabs on each side to remove the duct.
  

• Raise and support the Mercury Cougar, using multiple jackstands. Drain the engine coolant by removing the drain plug on the bottom of the radiator. Replace the drain plug after all the liquid flows into a clean container and disconnect the heater hoses from the core
  

• Withdraw the black vacuum supply hose from the vacuum source (you can now lower the vehicle). Disconnect the same hose from the air conditioner's vacuum reservoir tank.
  

• Detach the heater core cover that holds the core by releasing the retaining tabs and removing the clips. Remove the dash panel seal, vacuum hose and heater core bracket from the cover.
  

• Remove the heater core from the cover and the case seal from the core
  

Valve has to be stuck in the closed position if no air will come out from the tank. Period.

Sounds like air is being introduced into the fuel between the fuel tank and the fuel pump.

A couple of things come to mind:

Restricted air flow. Check heater inlet and outlet. Remove any obstructions.

If the heater has been used in a dusty environment, it may simply need a thorough cleaning.

Inadequate propane supply. Make sure there's enough gas in the tank to facilitate combustion.

If the tank is full, turn of the tank valve and disconnect the hose from the tank. Wait 5 minutes and reconnect the hose. Turn the tank valve on very, very slowly, until it's fully open and try relighting and operation of the heater.

If you have misplaced your Owners Manual, you can find it at www.deastech.com

Hope this helps to solve your problem.

If the unloader is not working properly the motor cannot overcome the head pressure. Two things to check. Make sure tank check valve is not leaking. Easy test. With pressure in tank, unplug the compressor from outlet and remove discharge hose at tank and listen for leak or spray soapy water. If leaking replace valve or try to clean debris from valve seat. If not leaking then problem is most likely at pressure switch unloader valve. Follow 1/4 inch hose from checkvalve at tank to connection at pressure switch. When pressure switch reaches cutoff pressure the switch opens the contacts and moves small tang against valve stem to release air from discharge hose. Check for proper function and repair as needed. Good luck.

Water Pump Replacement (4.8L, 5.3L and 6.0L Engines)
Removal Procedure
1. Drain the cooling system.
2. Loosen the air cleaner outlet duct clamps at these locations:

Throttle body

Mass Airflow/Intake Air Temperature (MAF/IAT) sensor
3. Remove the radiator inlet hose clip from the outlet duct.
4. Remove the air cleaner outlet duct.
5. If necessary, remove the engine sight shield.
6. Remove the radiator vent inlet hose from the radiator hose clips.
7. Reposition the inlet hose clamp at the water pump.
8. Remove the inlet hose from the water pump.
9. Remove the fan blade.
11. Reposition the outlet hose clamp at the water pump.
12. Remove the outlet hose from the water pump.
13. Reposition the surge tank outlet hose clamp at the water pump.
14. Remove the surge tank outlet hose from the water pump.
15. Reposition the heater inlet hose clamp at the water pump.
16. Remove the heater inlet hose from the water pump.
17. Remove the water pump bolts.
18. Remove the water pump and gaskets.
19. Discard the water pump gaskets
Installation Procedure Important: All gaskets surfaces are to be free of oil or other foreign material
during assembly.
1. Install the water pump and NEW gaskets
2. Install the water pump bolts.
3. Install the heater inlet hose to the water pump.
Zoom Sized for Print
Notice: Refer to Fastener Notice in Service and Precautions.
2.1. Tighten the bolts a first pass to 15 Nm (11 ft. lbs.).
2.2. Tighten the bolts a final pass to 30 Nm (22 ft. lbs.).
4. Position the heater inlet hose clamp at the water pump.
5. Install the surge tank outlet hose to the water pump.
6. Position the surge tank outlet hose clamp at the water pump.
7. Install the outlet hose to the water pump.
8. Position the outlet hose clamp at the water pump.
9. Install the accessory drive belt.
10. Install the fan blade.
11. Install the inlet hose to the water pump.
12. Position the inlet hose clamp at the water pump.
13. Install the engine vent inlet hose to the radiator hose clips.
14. If necessary, install the engine sight shield.
Important: Align the arrow at the throttle body end of the duct with the throttle
body attaching stud.
15. Install the air cleaner outlet duct
16. Install the radiator inlet hose clip to the outlet duct.
17. Tighten the air cleaner outlet duct clamps at these locations:

Throttle body

MAF/IAT sensor Tighten the clamps to 7 Nm (62 inch lbs.).
18. Fill the cooling system.

I hope this helps. The numbering is incorrect in the sequence but the instructions are correct.

Roy

There is air outlet in fuel line refueling point to tank this may clogged you need to replace the fuel line from the refueling point to fuel tank.......


Good luck....

if you have a air nozzle I would plug that in and see if you can get air out of that if no then you may have to adjust the hose/line pressure or you may have something inside that isn't allowing the air to come out of the tank in that case drain the tank and use either a small rod or peice of wire to poke through the outlet and clear it

Check the point on the tank (Bucket) where the hose connects to. Make sure there is no obstruction at the outlet of the bucket to the hose connection. Next make sure the hose has no kinks or no loops that may trap air to the drain. If necessary for a long run to the place of drainage raise the dehumidifier to a higher level for better drainage.