Land Rover Defender 90 110 Workshop 1984 Rover Manual
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19 PETROL FUEL SYSTEM SYMPTOM DIFFICULT STARTING WHEN COLD IIFFICULTSTARTING WHEN HOT ACK OF ENGINE POWER :RRATIC SLOW-RUNNING OR iTALLING ON DECELERATION :XCESSIVE FUEL CONSUMPTION V8 ENGINE CARBURETTER FAULT DIAGNOSIS POSSIBLE CAUSE Insufficient choke action Fast idle adjustment incorrect Float chamber level too IOW Carburetter llooding No fuel supply to carburetter Choke sticking on Blocked air cleaner Float chamber level too high No oil in damper or oil too thin Air valve sticking Water in fuel Float level too low Incorrect jet sctting Zarburctter air leaks Vlanifold air leaks lamper oil too thick. No oil in damper 4ir valve sticking 3locked air cleaner lamper oil too thick -,.-....--. I.. ... l:..*-,l -,.-I. .._^ *.-- IICVIICCLly U,U>CU CLLII,UIC;LLCI loat level too high Norn jets and necdlc ncorrect needle :hoke sticking on ?heck and refill to correct level with oil pecificd :lean and check freedom :it new air clcaner elements Ceplace with correct grade .L--,. .IICCI rlllU --A ICICL .* >I\)W ,.I iith carburetter tune and iidjusr instructions :heck and reset float lcvcl kck and repiacc as ncccssary :heck needlc typc :heck to ensure choke is rcturning to fully ~ff position. rcxt as ncccssary re Engine Fault diapnci\is 1Ul~ I-.. :.. 111 tlCL\IIULIIICL .,-..--, 4 .,.. ..^ 24
PETROL FUEL SYSTEM El LAND ROVER 110 TWIN TANK INSTALLATION Description The fuel system includes two fuel tanks, one at the rear of the vehicle and an additional fifteen gallon (68,20 litres) capacity tank on the right-hand side of the vehicle. Both tanks contain an electrically operated submerged fuel pump in addition to a fuel level indicator unit in each tank. An ignition controlled switch on the control panel enables the driver to select the tank to be used. The switch also energises the fuel level indicator unit of the tank selected and records the fuel level on the single indicator dial. When the ignition is switched ‘on’ the pump in the selected tank will draw fuel into the carburetter float chamber via a paper element type filter and a vapour separator. To prevent fuel vapourisation and air locks a spill return system is incorporated in the fuel pipe layout to pass back vapour and excess fuel from the vapour separator to the tank in use through a restrictor and a solenoid operated valve. The valve, which is encrgiscd by the tank selection switch, closes the port to the tank not in use and simultaneously opens the port to the sclccted tank. The restrictor is necessary to prevent fuel by-passing the carburetter and flowing back to the selected tank through the spill return systcm. In addition, a non-return valve is enclosed inside the hose connection of the supply pipe from the rear and side tanks to prevent the possibility of a back-flow of fuel along the supply lines to thc fuel tanks. ST1683M FUEL TANK SELECTION SWITCH A. Fuel tankswitch .. .. LAND ROVER 110 REAK TANK AND 90 SIDE TANK INSTAL1,ATION Description Fuel drawn by the electrically operated in-tank pump, is delivered to a paper element type filter. Situated bencath the right-hand front footwell attached to a chassis outrigger from the filtcr, fuel enters a vapour separator located on the left-hand side of the bulkhead in the engine compartment. Fuel finally cntcrs the carburetter float chamber from the port at the base of the vapour separator. The vapour separator comprises part of the spill return system and its purpose is to prevent fuel vapour causing air locks in the supply to the carburetter. Vapour and excess fuel flows back into the file! tmk thro~gh 2 restricter fitted !e the spi!! return port on the vapour separator. The restrictor is designed to assist in maintaining a constant fuel level in the vapour separator bowl and to prevent fuel flowing back to the tank at the same rate as the delivery. FUEL FILTER A. Fuel “Iter *. From fuel pump to filter pipc C. From fuel filter to carburetter via vapour separator 25
PETROL FUEL SYSTEM 119 . VAPOUR SEPARATOR A. Vapour separator B. Spill return to side tank C. Restrictor and spill return to solenoid valve D. Outlet from separator to carburetter SPILL RETURN SOLENOID VALVE A. Solenoid valve B. Spill return to side tank C. Spill return to rear tank D. To carburetter via filter and vapour separator NON-RETURN VALVE A. Non-return valve B. Spring C. Ball We 8 ST1844M FUEL PUMP A. Pump and motor B. Filter C. Gasket D. Electrical terminals E. Outlet pipe F. Fixing plate to tank G. Plastic tie clip - See CAUTION - remove and refit pump 27
PETROL FUEL SYSTEM LAND ROVER 110 TWIN TANK FUEL SYSTEM I 28 ::
PETROL FUEL SYSTEM E[ LAND ROVER 110 TWIN TANK FUEL SYSTEM KEY TO FUEL LINE INSTALLATION 1. In-tank fuel pump- rear tank. 2. In-tank fuel pump -side tank. 3. Fuel gauge tank unit -rear tank. 4. Fuel gauge tank unit -side tank. 5. Spill return solcnoid. 6. Fuel filter. 7. Fuel supply pipe - rear tank to filter via T-piccc. 8. Pipe, filter to vapour scparator. 9. Vapour separator. 10. Vapour separator outlet to carburetter. 1 1. Spill return pipe to fuel tank via restrictor and solenoid valve. 12. Spill rcturn pipe to side tank from solenoid. 13. Spill rcturn pipe to rear tank from solenoid. 14. Fuel filler - rear tank. 15. Breather pipc - rear tank. 16. Fuel filler - side tank. 17. Breather pipe - side tank. 18. Drain plugs side and rear tanks. 19. Non return valve incorporated in hose. .!::.: ,.
1191 PETROL FUEL SYSTEM LAND ROVER 110 BASIC FUEL SYSTEM 1. In-tank fuel pump. 2. Fuel gauge tank unit. 3. Fuel supply pipe to filter via connector. 4. Fuel filter. 5. Fuel supply pipe filter to vapour separator 6. Vapour separator. 7. Vapour separator, outlet to carburetter. 8. Spill return pipe to fuel tank via restrictor. 9. Fuel filler. 10. Breather hose. 11. Restrictor. 12. Fuel tank drain plug. f. f
-- : *:+ .* ; LAND ROVER 90 BASIC FUEL SYSTEM *- I. In-tank fuel pump. 2. Fuel tank gauge unit. 3. Fuel supply pipc to filter. 4. Fuel filter. 5. Fuel supply pipe filter to vapour separator 6. Vapour separator. 7. Vapour separator, outlet to carburctter. 8. Spill return pipc to fuel tank via restrictor. 9. Fuel filler. 10. Breather hose. 11. Restrictor. 12. Fuel tank drain plug.
El PETROL FUEL SYSTEM REMOVE REAR TANK FUEL PUMP To renew the pump it is first necessary to remove the fuel tank from the vehicle. Before commencing the following instructions it is essential that the WARNINGS and safety precautions concerning fuel tank draining and removal are studied and observed. These precautions are included in the introduction to this and each of the five books comprising the workshop manual for the Ninety and One -Ten vehicles. 1. Move vehicle to well ventilated area and disconnect the battery. 2. Remove the fuel tank drain plug and allow the fuel to drain into a suitable receptacle and refit the 3. Working from the right-hand side of the vehicle disconnect the fuel feed pipe and the spill return at the rubber connections. 4. Disconncct the fuel filter hose and breather hose from the tank. 5. Whilst, noting the cable colours, disconnect the electrical leads from the fuel gauge unit at the left -hand side of the vehicle. 6. If the vehicle is fitted with a towing ball drop-plate with support bars the bars must be removed. 7. Remove the eight nuts and bolts securing the anti -roll bar to the chassis and push the roll bar down to provide access to the tank. 8. Remove the left -hand lashing eye to facilitatc removal of the tank. 9. Place a support under the tank, preferably one which will enable the tank to be progressively lowered. 10. Remove the two nuts retaining the forward end of the tank. 11. Remove the two nuts securing the rear of the tank. 12. Carefully lower the tank sufficiently to enable the electrical leads to the fuel pump to be diconnected. 13. Finally rcmove the tank from the vehicle together with the pump and rear section of the fuel feed pipe. 14. Disconnect the rear section of the feed pipe from the pump. 1.5. Remove the five retaining screws and withdraw the fuel pump and sealing ring from the tank. 16. Cover the pump aperture in the tank to prevent the ingress of foreign matter. Plug. . Fitting fuel pump CAUTION: On some early models a modification was carried out to the fuel pump to prevent the possibility of the contacts earthing. These pumps can be recognised by a black plastic tie clip as illustrated. See Fuel System description. If the fuel tank only is being renewed and the original pump is being re-fitted, ensure that the tie clip is correctly positioned. 1 7. Fit the pump into the tank with a new Sealing ring so that the outlet pipe is directed towards the front of the vehicle and the electrical connections to the rear. 18. Offer -up tank to thc chassis and connect thc electrical leads black to negative (-) white to positive (+). 19. Locate front of the tank on the two captive bolts and secure with the mounting rubber, flat and spring washer and nut. .-w 19 ST1679M 32