6.1 FUEL TANK
If excessive amounts of water appear in the
filter/separator, the tank may be contami
-
nated and will require removal and cleaning
or replacement.
Fuel vapors create fire
and explosion hazards which can result
in severe personal injury or death. Do
not allow any open flame, smoking ma
-
terials or other potential igniters near
the fuel system.
6.1.1 Removal and Disassembly
Disconnect the negative
battery cable. An electrical arc at the
sending unit can act as an igniter creat-
ing a fire and explosion hazard, which
can result in personal injury or death.
1. Disconnect cables from battery and re-
move battery from tractor (to prevent a
possible spark when removing tank and
related components).
2. Remove the rear deck plate from over
the tank. It is secured by four 5/16 x 1”
HHCS and nylock nuts.
3. Place a suitable container beneath drain
opening at bottom rear of tank, accessi
-
ble through hole in frame.
4. Remove drain plug from fuel tank and
drain tank. Clean up any spillage.
5. Remove filler cap and cover filler hole to
keep out debris. Remove tank straps
from tank attached at top rear of tank and
at lower front of tank.
6. Disconnect fuel sending wire and fuel
hoses. Tank can now be lifted from trac
-
tor for cleaning and inspection.
IMPORTANT! Use care when handling the
sending unit to prevent damaging it.
6.1.2 Cleaning and Inspection.
1. Install drain plug on bottom of tank.
2. Pour a detergent and water solution into
tank.
3. Agitate mixture by rotating tank. Make
sure solution contacts entire interior sur
-
faces of tank.
4. Drain cleaning solution from tank. Rinse
and repeat steps 1-4.
5. Flush interior of tank with clean water
and allow to air dry.
6. Inspect filler cap and sending unit for
corrosion and damage.
7. Inspect tank protectors for deterioration.
8. Inspect fuel tank for damage. Repair or
replace tank as needed.
9. Check tank mounting straps for rust and
corrosion.
10. Inspect elbows for damage.
6.1.3 Repair or Replacement.
Fuel tanks can be le
-
thal bombs capable of instantly killing
anyone nearby. Before soldering or
brazing, clean the tank thoroughly. Fill
tank with an inert gas such as carbon di
-
oxide or nitrogen, or completely fill with
water.
1. Repair tank by soldering or brazing if
needed. Re-prime and paint any re
-
paired areas of tank.
2. Test any repair with wet soap lather.
Place an air hose in tank and admit air.
By holding a rag around hose where it
enters, a mild pressure will be built up. If
PAGE 6-2
JANUARY 31, 2007
M200 MB4 Tow Tractor Manual No. 42975
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