Land Rover Defender 90 110 Workshop 1984 Rover Manual

							PETROL FUEL SYSTEM 1191 
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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