RAM 2500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1999)
12. Fuel Heater: The fuel heater is located inside fuel filter housing (header). The heater mounting plate, heating element, temperature sensor and
wiring harness are serviced as one assembly.
a. Disconnect heater pigtail harness electrical connector from main engine wiring harness near upper/rear of filter.
b. The plastic electrical connector at end of 2-wire pigtail harness will have to be removed from wiring harness before attempting to pass harness
through filter header.
c. Note locations (colors) of wires in connector before removing connector.
d. Remove clip retaining wires to connector.
e. Remove wires from connector.
f.
Remove 3 fuel heater mounting screws.
g. Press down on heater sealing grommet to remove heater from filter canister header.
h. Pass wire harness through hole in filter header while removing heater from header.
INSTALLATION
1. Clean inside of canister and canister header.
2. Fuel Heater:
a. Lift fuel heater assembly into filter header while passing wire harness upward through hole in header. Heater sealing grommet should protrude
at top of filter header.
b. Instal 3 fuel heater mounting screws and tighten to 2-3 Nm (15-20 in. lbs.) torque.
c. Install 2 wires into electrical connector and install connector clip.
d. Connect heater pigtail harness electrical connector to main engine wiring harness.
3. Install new O-ring seal to WIF sensor.
4. Install WIF sensor to canister. tighten to 2-3 Nm (15-20 in. lbs.) torque.
5. If drain valve assembly is being replaced, tighten mounting screws to 3-5 Nm (30-40 in. lbs.) torque.
6. Install new O-rings.
7. Install new seal between canister and canister header.
If filter canister is not filled with clean diesel fuel before installation, manual air bleeding of fuel system may be necessary (temporary rough
engine running may occur). If necessary, refer to Air Bleed Procedures.
8. Load filter into canister.
9. Fill filter canister with clean diesel fuel.
10. Apply a light film of clean diesel oil to all seals.
11. Position canister assembly to canister header. Note locating tabs on canister should align into notch on canister header.
12. Install canister nut and tighten to 14 Nm (10 ft. lbs.) torque.
13. Connect electrical connector to WIF sensor.
14. Connect drain hose to bottom of drain valve.
15. Start engine and check for leaks.
Air Bleed Procedure
A certain amount of air becomes trapped in the fuel system when fuel system components on the supply and/or high-pressure side are serviced or
replaced. Primary air bleeding is accomplished using the electric fuel transfer (lift) pump. If the vehicle has been allowed to run completely out of fuel,
the fuel injectors must also be bled as the fuel injection pump is not self-bleeding (priming).
Servicing or replacing components on the fuel return side will not require air bleeding.
WARNING: DO NOT BLEED AIR FROM THE FUEL SYSTEM OF A HOT ENGINE.
