This is from the Service manual. I will be doing the same in the next few weeks let me know how it goes.
SERVICE PROCEDURES
REMOVING FUEL TANK (110 and 111" W/B
Vehicles)
Should it become necessary to remove a fuel tank for repair, gauge removal, or installation of a new tank (Figs. 1, 2 or 3), proceed as follows.
FUEL SUPPLY TUBE
LEAD
(1) Drain fuel tank dry by disconnecting fuel line
at pump and then connect a siphon tube. Collect drained fuel hi a suitable container. Disconnect fuel line ground strap and wire lead to gauge unit. (Front center near top of tank 111 inch W/B Vehicles.) (Fig. 6.)
(2) Disconnect vent tube from filler tube at connector.
(3) Remove screws that hold filler tube and gasket, to rear quarter panel.
(4) Remove 5 screws and washers that attach filler
tube seal to floor pan, then remove end of vent tube from seal.
(5) Grasp filler tube with both hands, twist tube, and at same time, force downward into tank, until end of tube clears quarter panel. Remove gasket. (If tube is frozen in tank, use a rubber lubricant around joint and work into grommet, after sliding dust shield out of way.)
(6) Twist (or rotate) filler tube approximately 180 degrees, then work tube carefully out of tank and dust shield seal. Remove tube from inside of trunk compartment.
(7) Remove nuts that hold tank retaining straps to "J" bolts. Allow straps to drop or hang, then lower tank and remove from under car.
(
Remove tank gauge unit, using spanner wrench C-3582. Slide gauge assembly out of fuel tank. Discard gasket.
(9) If necessary check operation of fuel gauge, as described in Electrical Section of Manual.
INSTALLING FUEL TANK (110 and 11TW/B Vehicles) (Figs. 1,2 or 3)
Before installing the fuel gauge, check the con tion of the filter on the end of the suction tube. If 1 filter is plugged, install a new filter.
(1) Install a new rubber grommet in tank. Inser new gasket in fuel gauge opening recess then sli gauge into tank. Align positioning tangs on gau with those in tank. Install lockring, then tighten ! curely, using Tool C-3582. (If tank insulator was to or damaged during removal of tank, be sure and stall a new insulator at reassembly.)
(2) Locate insulation pad on top of tank. Sli tank under car and up in position. Hold in positic then raise retaining straps and thread onto "J" bol Install nuts, and tighten. (Not over 50 inch-pounds.)
(3) Lubricate rubber grommet using a suitat rubber lubricant, then slide filler tube down throuj dust seal and into tank, far enough to clear quart panel. Twist (or rotate) filler tube 180 degrees aj align with opening in quarter panel. Install a ne gasket over end of tube, then slowly withdraw tul from tank and into position against quarter pan< Align attaching screw holes; install screws and tigfc en securely. Slide vent tube through seal.
(4) If dust seal was disturbed during removal ope ation, realign and tighten attaching screws securely.
tube seal to floor pan, then remove end of vent tube from seal.
(5) Grasp filler tube with both hands, twist tube, and at same time, force downward into tank, until end of tube clears quarter panel. Remove gasket. (If tube is frozen in tank, use a rubber lubricant around joint and work into grommet, after sliding dust shield out of way.)
(6) Twist (or rotate) filler tube approximately 180 degrees, then work tube carefully out of tank and dust shield seal. Remove tube from inside of trunk compartment.
(7) Remove nuts that hold tank retaining straps to "J" bolts. Allow straps to drop or hang, then lower tank and remove from under car.
(
Remove tank gauge unit, using spanner wrench C-3582. Slide gauge assembly out of fuel tank. Discard gasket.
(9) If necessary check operation of fuel gauge, as described in Electrical Section of Manual.
INSTALLING FUEL TANK (110 and 11TW/B Vehicles) (Figs. 1,2 or 3)
Before installing the fuel gauge, check the con tion of the filter on the end of the suction tube. If 1 filter is plugged, install a new filter.
(1) Install a new rubber grommet in tank. Inser new gasket in fuel gauge opening recess then sli gauge into tank. Align positioning tangs on gau with those in tank. Install lockring, then tighten ! curely, using Tool C-3582. (If tank insulator was to or damaged during removal of tank, be sure and stall a new insulator at reassembly.)
(2) Locate insulation pad on top of tank. Sli tank under car and up in position. Hold in positic then raise retaining straps and thread onto "J" bol Install nuts, and tighten. (Not over 50 inch-pounds.)
(3) Lubricate rubber grommet using a suitat rubber lubricant, then slide filler tube down throuj dust seal and into tank, far enough to clear quart panel. Twist (or rotate) filler tube 180 degrees aj align with opening in quarter panel. Install a ne gasket over end of tube, then slowly withdraw tul from tank and into position against quarter pan< Align attaching screw holes; install screws and tigfc en securely. Slide vent tube through seal.
(4) If dust seal was disturbed during removal ope ation, realign and tighten attaching screws securely.
(5) Reconnect vent tube to filler tube connector.
(6) Reconnect fuel supply line, ground strap wire lead to gauge (Fig. 5).
(7) Refill tank and check for leaks.
FUEL TANK E.C.S. (EVAPORATION CONTROL SYSTEM)
GENERAL INFORMATION
Certain Chrysler Corporation Vehicles are equipped with an Evaporation Control System (ECS) to reduce the loss of fuel from the fuel system to the atmosphere by evaporation. This is a closed system which controls fuel expansion and feeds fuel evaporation emissions from the carburetor or fuel tank. The vapors pass through vent lines to the crankcase by way of the crankcase inlet air cleaner. Since fuel vapors are two to four times heavier than air, they settle to the bottom of the crankcase. With the engine running the fuel vapors are purged from the crank-case and together with the normal crankcase vapor are drawn via the crankcase ventilation system, which
is an existing part of the Cleaner Air System (CA$ into the base of the carburetor to be burnt by engini combustion.
The possible expansion of fuel in a full fuel tank; due to a rise in temperature, is allowed for by a 1.4 gallon over-fill limiter tank inside the main fuel tanl which fills much slower than the main tank. When th<= main tank is filled, it remains essentially empty • allow for thermal expansion. (Fig. 1).
The loss of any fuel or vapor out of the filler neci is prevented by the use of a filler cap which will release only under significant pressure (1/2 to 1 psi vacuum (1/4 to 1/2 psi). This cap is identified by ....
words pressure-vacuum and must be replaced by a similar unit if replacement is necessary, in order for the system to remain effective. (Fig. 1).
Because the fuel tank is flat on top, four vents are used, one in each corner of the tank and are connected to a vapor-liquid separator by rubber hoses. The vapor-liquid separator is a piece of two inch steel tubing mounted at an angle inside the trunk of the vehicle (quarter panel for wagons) which internally holds four vent lines from the tank and a vent line which leads to the crankcase inlet air cleaner. These lines are of different heights so the tank will always be vented regardless of vehicle attitude, and fuel vapor will be transferred to the crankcase. One vent line from the tank is short to provide a drain back to the tank for any liquid fuel which may get into the separator during maneuvers or incline parking. The
vent to the crankcase is at the highest point in the separator and has a small orifice to minimize liquid fuel transfer to the crankcase. (Fig. 1).
The ECS system also includes closed ventilation of fuel vapor from the carburetor bowl. On eight cylinder engines this is accomplished via a hose connection from the carburetor bowl to the crankcase inlet air cleaner. For six cylinder engines the hose from the carburetor bowl is connected into the crankcase via a connecting nipple on the fuel pump. This fuel pump also incorporates a bleed device which prevents buildup of pressure in the fuel supply line between the pump and the carburetor. This feature aids hot starting. Six cylinder engines with ECS use a "bleed" fuel pump without the ECS nipple. In event of fuel pump replacement, it is important that the correct pump is used.
