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Fuel Charging and Controls The fuel charging and controls system consists of: fuel pressure regulator (9C968) fuel injection supply manifold (9F792) fuel injectors (9F593) fuel shut off valve solenoid (9D278) fuel pressure relief valve (9H321) injection pressure sensor engine fuel temperature sensor fuel charging wiring harness Component Location Fuel Pressure Regulator The fuel pressure regulator is located on the inside of the LH frame rail just forward of the transmission support crossmember. It is part of an assembly that includes the coalescer/filter. The fuel pressure regulator reduces the line pressure from tank pressure 20685 kPa (3000 psi) to line pressure 655 kPa (95 psi). Heating/Defrosting—Natural Gas Vehicle Fuel pressure regulator heating is provided by two 3/8-inch taps from the existing heater supply and return hoses on the RH rear of the engine. Two high-temperature 3/8-inch ID heater hoses (packaged with the front low-pressure fuel line) are used to connect the fuel pressure regulator to the tap points on the engine heater hoses. Refer to the Line — Low Pressure Fuel procedure in Section 310-01B for fuel pressure regulator heater hose replacement. Fuel Pressure Regulator Heater Hoses Fuel Injection Supply Manifold The fuel injection supply manifold delivers high-pressure fuel from the vehicle fuel supply line to the fuel injectors. The fuel injection supply manifold consists of the following: a tubular fuel rail eight fuel injector connectors a fuel pressure relief valve a fuel shut off valve solenoid mounting attachments which locate the fuel injection supply manifold and provide fuel injector retention. a fuel inlet connection which has a push-connect fitting an injection pressure sensor an engine fuel temperature sensor Fuel Injection Supply Manifold Fuel Injectors The natural gas fuel injectors are electro-mechanical devices that meter fuel delivered to the engine. The natural gas fuel injectors are mounted in the lower intake manifold (9424) and are positioned so that their tips direct fuel just ahead of the engine intake valves (6507). The natural gas fuel injector bodies consist of a solenoid and a needle and valve assembly. Natural gas fuel injectors can be identified by an aqua cap on the injector body. Fuel Shutoff Valve Solenoid The fuel shut off valve solenoid seals the upstream fuel pressure from entering the fuel injection supply manifold when the engine is not running. The fuel shut off valve solenoid is open only when it is activated by the solenoid valve (fuel pump) relay. Fuel Pressure Relief Valve The fuel pressure relief valve is located on the fuel injection supply manifold, and is used to relieve fuel system pressure from the fuel delivery system. Injection Pressure Sensor The injection pressure sensor is located on the fuel injection supply manifold, and is used to provide a signal to the powertrain control module (PCM) (12A650) that is proportional to pressure in the fuel injection supply manifold. Engine Fuel Temperature Sensor The engine fuel temperature sensor is located on the fuel injection supply manifold, and is used to provide a signal to the powertrain control module that indicates the temperature of the fuel in the fuel injection supply manifold. Fuel Charging Wiring The fuel charging wiring is a single harness that includes electrical connectors for the fuel injectors, ignition coils and various sensors, valves and senders that monitor all engine functions. Fuel Charging Wiring

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1. Rotate crankshaft (6303) to zero degrees top dead center (TDC) on the compression stroke. 2. Disconnect battery ground cable (14301). 3. Drain engine cooling system. Refer to Section 03-03. 4. Remove air cleaner outlet tube (9B659) to throttle body (9E926) . Refer to Section 03-12. 5. Mark and remove vacuum lines to upper intake manifold (9424). 6. Disconnect EGR backpressure transducer hose from EGR valve to exhaust manifold tube (9D477) , loosen lower EGR valve to exhaust manifold tube nut and rotate EGR valve to exhaust manifold tube away from EGR valve (EGR valve) (9D475) . 7. Disconnect the throttle position sensor (TP sensor) (9B989), idle air control valve (IAC valve) (9F715) , EGR backpressure transducer and EGR vacuum regulator solenoid electrical connectors. 8. WARNING: COVER FUEL PRESSURE RELIEF VALVE (9H321) WITH SHOP CLOTH TO PREVENT ACCIDENTAL FUEL SPRAY INTO EYES. Relieve pressure at the fuel pressure relief valve . Refer to Section 03-04A. 9. Remove fuel tube safety clips. 10. CAUTION: Cover fuel tube ends with clean shop cloths to prevent dirt from entering opening. Disconnect fuel tubes (9291). Refer to Section 10-01. 11. Remove upper intake manifold as described. Discard old intake manifold upper gasket (9H486) . 12. Disconnect engine control sensor wiring retainers from rocker arm cover stud bolts and each fuel injector, and position the engine control sensor wiring (12A581) out of the way. 13. NOTE: Fuel injectors and fuel injection supply manifold (9F792) may be removed with lower intake manifold as an assembly. Remove fuel injection supply manifold and fuel injector. 14. Remove ignition wires from spark plugs (12405) . Refer to Section 03-07A. Remove wire harness retainers from valve cover retaining stud bolts. 15. Remove ignition coil (12029) and bracket from LH front cylinder head (6049) and set aside. Refer to Section 03-07A. 16. Disconnect upper radiator hose (8260) and heater water hoses (18472) . 17. Remove camshaft position sensor (CMP sensor) (6B288) and housing. Refer to Section 03-14. 18. Disconnect engine control sensor wiring from engine coolant temperature sensor (ECT sensor) (12A648) and the water temperature indicator sender unit (10884) . 19. If LH (front) cylinder head is being removed, perform the following: Disconnect generator electrical connectors. Remove drive belt (8620). Refer to Section 03-05. Remove drive belt tensioner (6B209). Refer to Section 03-05. Remove generator brace and generator (GEN) (10346). Remove power steering support bracket and power steering pump (3A674) as an assembly and set aside in a position to prevent fluid from leaking out. Remove oil level indicator tube retaining nut from exhaust manifold stud bolt. Rotate or remove oil level indicator tube (6754) from exhaust manifold (9430) . 20. If RH (rear) cylinder head is being removed, perform the following:

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An exhaust leak at the exhaust manifolds may be evident on some vehicles. This may be due to heat causing a reduction in bolt torque on the exhaust manifolds. ACTION Install new exhaust manifold bolts. Refer to the following Service Procedure and Part Application Chart for details. SERVICE PROCEDURE 1. If an exhaust leak exists at the exhaust manifold due to a reduction in bolt torque, remove the manifold bolts and the exhaust manifold and check the overall flatness of the manifold. The manifold should not exceed 0.25 mm (0.010″) out- of-flat. Refer to the appropriate model/year Service Manual for manifold removal procedures. 2. If the vehicle is covered under the emissions warranty period, replace the manifold if it is out-of-flat. If the vehicle is out of the emissions warranty period, resurface the exhaust manifold. NOTE IF THE MANIFOLD IS TO BE RESURFACED, THE BOLTS MUST BE SHORTENED TO ACCOMMODATE THE EXHAUST MANIFOLD. THE BOLTS SHOULD HAVE THE LEADING “DOG POINT” REMOVED TO PREVENT BOTTOMING INTO THE HOLE. 3. Install the manifold using new mounting hardware, but DO NOT USE WASHERS TO INSTALL THE MANIFOLD. Torque the bolts to 34-47 N.m (25- 35 lb-ft). NOTE THERE SHOULD NOT BE ANY TYPE OF GASKET USED BETWEEN THE EXHAUST MANIFOLD AND THE CYLINDER HEAD. 4. Check all exhaust system fittings loosened during repair for adequate tightness and allow engine to warm up. Recheck exhaust system for leaks and repair as required.

repair and maintenance manual covers all US and Canadian models of Mitsubishi Eclipse, Eagle Talon, and Plymouth Laser, 1990 through 1998.
What’s Inside?
Introduction: About this manual | Introduction | Vehicle identification numbers | Maintenance techniques, tools and working facilities | Buying parts | Jacking and towing | Booster battery (jump) starting | Conversion factors | Automotive chemicals and lubricants | Safety first! | Troubleshooting

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REMOVAL PROCEDURE IMPORTANT: The fuel injector wiring harness connectors must be connected to their respective fuel injectors. Failure to connect the fuel injector connectors to their respective fuel injectors may result in excessive exhaust emissions and poor engine performance. 1. 2. 3. 4. Disconnect the battery ground (negative) cable. Remove the fuel injector sight shield. Drain the engine coolant from the cooling system. Remove the throttle body air inlet duct. 5. 6. 7. 8. 9. Remove the accelerator control and cruise control cables with bracket from the throttle body. Disconnect the wiring harness connectors from the Throttle Position (TP) sensor and the Idle Air Control (IAC) valve. Disconnect the engine left side spark plug wires. Disconnect the engine left side spark plug wire harness attachment clip. Disconnect the throttle body heater hoses from the throttle body. 10. Disconnect the vacuum hoses from the evaporative emissions canister purge solenoid valve. 11. Remove the evaporative emissions canister purge solenoid valve. 12. Remove the ignition coil bracket with the coils. 13. Disconnect the wiring harness from the Manifold Air Pressure (MAP) sensor. 14. Disconnect the vacuum hose from the Manifold Air Pressure (MAP) sensor and the upper intake manifold.