Honda Bmw 5 Service Manual

Fuel Tank and Fuel Pump 
Fuel pressure gauge, installing 
(V-8 models) 
Remove  engine cover by pressing  down on  pins (arrows) to 
release  cover locks. 
4 Disconnect  and remove fuel supply  line from  lefl  side  of fuel 
rail  by sliding 
loclting collar  in (arrows) and pulling  lines 
apart. 
NOTE- 
* ME2 TU and MS43 vehicles (1999 and  later models) use a 
non-return fuel line with  only one line  to the  fuel 
rafl. 
BMW uses three styles  of fuellfne connections; a one-use 
clamp, a locking...

Fuel Tank and Fuel Pump 
Fuel delivery, 
testing 
Checitino fuel delive~ is a fundamental  oart of troubleshoot- .. ing and  diagnosing thk DME system. ~ukl pressure  directly 
influences 
fuel delivery. An accurate  fuel pressure gauge  will 
be  needed to make  the tests. 
There are  two significant fuel deliveryvalues  to be measured: 
* System pressure - created by  fuel pump  and maintained 
by pressure regulator 
Residual pressure 
- pressure maintained in closed sys- 
tem after engine and  fuel...

Fuel Tank and Fuel Pump 
4 Relieve  system pressure  and attach  a fuel pressure  gauge as 
described in  Fuel pressure  gauge, installing  (6-cylinder 
models)  or Fuel  pressure  gauge, installing 
(V-8 models). 
WARNING- 
Fuel in fuel line  is under pressure  (approx. 3 - 5 bar  or 45 - 
75psi) and  may  be expelled underpressure. Do  not smoke 
or 
worlc near heaters  or other fire  hazards. Keep a fire  ex- 
tinguisher  handy Before disconnecting  fuel hoses,  wrap a 
cloth around fuel hoses  to...

. . 
I Fuel Tank and Fuel Pump I 
4 Relieve  system pressure and attach  afuel pressure gauge  as 
described in  Fuel pressure  gauge, installing  (6-cylinder 
models)  or Fuel pressure  gauge, installing 
(V-8 models). 
WARNING - 
Fuel in fuel line  is underpressure  (approx. 3 - 5 bar  or45 - 
75psi) and  may  be expelled underpressure.  Do not smoke 
or work  near heaters  or other  fire hazards.  Keep a fire  ex- 
tinguisher  handy. Before disconnecting  fuel hoses,  wrap a 
cloth  around fuel hoses...

.- 
err- .- Fuel Tank and Fuel Pump 
FUELPUMP AND FUELLEVELSENDER 
E39 models  use a two-lobed  fuel tank.  Each lobe  of the  tank 
has  its own  fuel level  sending  unit. Each sender  has a float 
connected  to a variable  resistance  wipercontact.  To equalize 
fuel  level  between the two 
tank lobes, a siphon pump is in- 
stalled  in the  left lobe. 
When  replacing  asender or fuel  pump, always  replace hose 
clamps, 
gasltets and  O-rings. 
WARNING 
- 
When  removing the fuel level sender  or...

.- 
I Fuel Tank and Fuel Pump 
- Expose right side access cover: 
Peel  forward lip  of carpet. 
Release rubber grommet from center  of access cover  insu- 
lation. 
Peel back  insulation at 
perforations to expose  fuel tank  ac- 
cess  cover. 
Remove right  side cover  to expose  electrical harness con- 
nector. 
WARNING - 
Fuel  may be spilled.  Do not smolce or work  near heaters  or 
other  fire hazards. 
When  disconnecting  fuel hose,  wrap  shop rag around 
end  of hose  to prevent spray  of...

.- . 
Fuel Tank and  Fuel Pump 
- To reinstall: 
Use  new sealing  ring at tank  collar. 
* Align tab of sending unit  with matching  recess in opening 
of  tank. 
Be sure that fuel line connections point  in same direction 
as  they  came  out. 
Reconnect harness connector  and hose. 
Fill  tank  and check  for leaks by  running engine. 
Install access  cover and its mounting  fasteners. 
CAUTIOI\C 
After finishing  repairs but before  starting  engine, be sure 
there  is at least 
5 liters (1.5...

/ ~uel Tank and Fuel Pump 
4 Remove tank sending unit: 
Disconnect electrical harness  connector. 
Disconnect hose  (arrow). 
- Unscrew threaded collar  from fuel level  sender. 
NOTE- 
BMW special  spanner 16 1 020 should be used  to remove 
and  install  the threaded  collar. Damage  to the  collar  may 
result  if the  special  tool is not  used. 
Slowly  withdraw  assembly  from tank, allowing fuel  to drain 
off. If necessary,  push level sender arm toward sending 
unit  to facilitate  removal. 
CA...

7 .- A Fuel Tank and Fuel Pump 
Siphon pump, removing  and installing 
The fuel compensating siphon  pump equalizes fuel  level 
between the two fuel tank  lobes. 
- Drain fuel tank  as described later, 
WARNING - 
Fuel may be spilled.  Do not smoke or work  near heaters or 
other  fire hazards. 
- Remove  left and right fuel  level sensors  and fuel pump  as 
described  earlier. 
4 Once left side level  sensor unit has been lifted partially out 
of  tank, disconnect  tank siphon hose by pressing  tabs...

-- 
I Fuel Tank and Fuel Pump 
The plastic fuel tank is mounted  underneath  the center  of the 
car  (underneath  the rear seat).  Mounted in the  fuel tank  are 
the  fuel pump  and fuel level  sending units. Connecting lines 
for  the  evaporative emission control  system and expansion 
tank are also attached  to the  tank. 
Fuel 
tank  capacity for E39 models 
Tank  capacity 
70 liters (18.5 gal) 
Reserve  capacity 
8 liters (2.1 gal) 
Fuel tank, draining 
Drain fuel tank into a safe storage  unit...