Файл: 92FWD_14.pdf

FUEL LINES AND HOSES

Perform the Fuel System Pressure Relief Procedure before servicing the fuel system. The procedure must be done to bleed fuel pressure from the system before removing clamps or hoses.

Use care when removing fuel hoses to prevent damage to hose or hose nipple. Always use new hose clamps, of the correct type, during reassembly. Tighten hose clamps to 1 NIm (10 in. lbs.) torque. Do not use aviation style clamps on this system or hose damage may result.

FUEL SYSTEM PRESSURE RELEASE PROCEDURE

CAUTION: Before servicing the fuel pump, fuel lines, fuel filter, throttle body, or fuel injector, the fuel system pressure must be released.

(1)Loosen fuel filler cap to release fuel tank pres-

sure.

(2)Disconnect injector wiring harness connector (Fig. 1).

tery positive post for no longer than 5 seconds. This releases system pressure.

(5)Remove jumper wires.

(6)Continue fuel system service.

THROTTLE BODY

CAUTION: The fuel system is under a constant pressure of 270 kPa (39 psi). When servicing the fuel portion of the throttle body, release fuel pressure before disconnecting any tubes. Refer to the fuel pressure release procedure.

Always reassemble throttle body components with new O-rings and seals where applicable. Never use silicone lubricants on O-rings or seals, damage may result. Use care when removing fuel tubes to prevent damage to quick connect fittings or tube ends. Refer to Fuel Hoses, Clamps, and Quick Connect Fittings in the Fuel Delivery Section of this Group.

REMOVAL

(1)Remove air cleaner (Fig. 2).

(2)Perform fuel system pressure release procedure.

(3)Disconnect negative battery cable.

Fig. 1 Injector Harness Connector

(3)Connect a jumper wire between terminal Number 1 of the injector harness and engine ground.

(4)Connect a jumper wire to the positive terminal Number 2 of the injector harness and touch the bat-

Fig. 2 Throttle Body and Air Cleaner Assembly

(4) Disconnect vacuum hoses and electrical connectors (Fig. 3).

14 - 42 FUEL SYSTEMS

(5)Remove throttle cable. If equipped, remove the speed control and transmission kickdown cables.

(6)Remove return spring.

(7)Loosen fuel tube clamp on valve cover (Fig. 4).

Fig. 4 Fuel Line Clamp

(8)Wipe quick connect fittings to remove any dirt. Remove fuel intake and return tubes. Refer to Fuel

Hoses, Clamps and Quick Connect Fittings in the Fuel Delivery Section of this Group. Place a shop towel under the connections to absorb any fuel spilled.

(9)Remove throttle body mounting screws and lift throttle body from vehicle. Remove throttle body gasket from intake manifold.

INSTALLATION

(1)Using a new gasket, install throttle body and tighten mounting screws to 20 NIm (175 in. lbs.) torque.

(2)Lubricate the ends of the fuel supply and return tubes with clean 30 weight oil. Connect fuel lines to quick connect fittings. Refer to Fuel Hoses, Clamps and Quick Connect Fittings in the Fuel Delivery Section of this Group. After the fuel tubes are connected to the fittings, pull on the tubes to ensure that they are fully inserted and locked into position.

(3)Tighten the fuel tube clamp on the valve cover.

(4)Install return spring.

(5)Install throttle cable. If equipped, install kickdown and speed control cables.

(6)Install wiring connectors and vacuum hoses.

(7)Install air cleaner.

(8)Reconnect negative battery cable.

CAUTION: When using the ASD Fuel System Test, the Auto Shutdown (ASD) Relay remains energized for either 7 minutes, until the test is stopped, or until the ignition switch is turned to the Off position.

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(9) With the ignition key in ON position, access the DRB II ASD Fuel System Test to pressurize the fuel system. Check for leaks.

FUEL FITTING

REMOVAL

(1)Remove air cleaner assembly.

(2)Perform Fuel System Pressure Release proce-

dure.

(3)Disconnect negative battery cable.

(4)Loosen fuel tube clamp on valve cover.

(5)Wipe any dirt from around quick connect fittings. (Fig. 5) Place a shop towel under the connections to catch any spilled fuel. Remove fuel tubes from quick connect fittings. Refer to Fuel Hoses, Clamps and Quick Connect Fittings in the Fuel Delivery Section of this Group.

(6)Remove each fitting from throttle body and note inlet diameter. Remove copper washers.

Fig. 5 Servicing Fuel Fitting

INSTALLATION

(1)Replace copper washers with new washers.

(2)Install fuel fittings in proper ports and tighten to 20 NIm (175 in. lbs.) torque.

(3)Lubricate ends of the fuel tubes with 30 weight oil. Insert the tubes into the quick connect fittings.

Refer to Fuel Hoses, Clamps and Quick Connect Fittings in the Fuel Delivery Section of this Group. After the fuel tubes are connected to the fittings, pull on the tubes to ensure that they are fully inserted and locked into position.

(4)Tighten fuel tube clamp on valve cover.

(5)Reconnect negative battery cable.