Chevrolet DB90 Series, Руководство по обслуживанию

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S ec. 8A-
FUEL T
for any
p la ce it.
the neck
174
ANK, G A U G E, AND LINES
should be cov ered with a p ro tectiv e cover
h id e is put into a paint oven or if a heat
The cap
if the ve
lamp is y se d near the tank. If the alloy should m elt
■eason, no attempt should be made to r e -
The cap a ssem b ly should be replaced. It
can be replaced by working the safety chain out of
of the tank. A new cap and chain should be
in sta lled ; so that chain is hooked inside the neck
and w ill not allow cap to fa ll during norm al u se .
A cfyeck valve vent (fig. 1) is used in conjunc­
tion with the safety cap a s a vent for the tank and
a check Valve in c a se the tank b ecom es inverted.
The vent port should be kept open and clea r at a ll
tim e s. Apy dirt should be rem oved from the port,
the fuel cap rem oved and air forced into the vent
port to clean it.
J
FUEL G A U G E SYSTEM
R efer to "FUEL TANK, LINES, AND GAUGE
SYSTEM" (SEC. 8A) of the 1970 Heavy Duty Truck
S erv ice ila n u a l S T 135-70, pages 8-5 and 8-6 for
fig u res lb , 11, and 12.
T A N K U f f I T
The tuel tank stra in er, fuel pickup pipe, and
tank gauge unit co m p rise a com plete a ssem b ly .
The fuel tank gauge unit is mounted on top of fuel
tank. The large area fuel stra in er i s of sufficiently
fine m esh to prevent entrance of contam inants into
fuel sy ste m and op erates with a se lf-c le a n in g
action. Inspect condition of stra in er w henever tank
unit is rem oved and rep lace or clean as required.
A p ro tectiv e top (fig. 10) is u sed on som e
m odels to sh ield the fuel gauge a ssem b ly . The tank
unit (fig. 11 or 12) houses a variab le r e s is to r
(rheostat) which con trols the flow of current through
the dash gauge according to p osition of the float.
The tank unit rh eostat may be checked for accu r­
acy with an oh m m eter. With float in "EMPTY" po­
sitio n , an ohm m eter connected a c r o s s the rheostat
should indicate 0 to 1.0 ohm r e sista n c e . With float
in "FULL" position , r e sista n c e should m easure
approxim ately 90 ohm s.
A s the tank is fulled, the tank unit float arm
w ill r is e to in c r e a se rheostat r e sista n c e which in
turn w ill cau se the pointer in dash gauge to move
toward the "FULL" p osition.
FUEL TANK AND LINE TORQUE SPECIFICATIONS
TORQUE
17 25 In. Lbs.
42 52 In. Lbs.
25 30 Ft. Lbs.
6 8 Ft. Lbs.
25 30 Ft. Lbs.
17- 25 In. Lbs.
8- 12 Ft. Lbs.
(7/16 x 14).
(1/2 x 20).
15- 20 F t Lbs.
40- 50 Ft. Lbs.
15- 20 Ft. Lbs.
17 25 In. Lbs.
5
6 Ft. Lbs.
55 75 Ft. Lbs.
30 40 Ft. Lbs.
70 80 Ft. Lbs.
17 25 In. Lbs.
3- 5 Ft. Lbs.
30- 35 Ft. Lbs.
25- 35 Ft. Lbs.
35- 45 Ft. Lbs.
8- 10 Ft. Lbs.
65- 85 Ft. Lbs.
50- 60 Ft. Lbs.
65- 85 Ft. Lbs.
90- 110 Ft. Lbs.
125-145 Ft. Lbs.
286-M (7/16 x 14).
301-M (7/16 x 14).
.(Bolt) (1/2 x 13).
(Nut) (5/8 x 11).
(Bolt) (5/8 x 11).
APPLICATION
Gaugt Assembly Mounting Screw
Neck Assembly Mounting Stud ..
Tank Strap to Mounting Bracket
Tank Strap to Frame .................
Tank Mounting Bracket to Frame
Tank
18 GALLON TANK
20 GALLON TANK
Gaugs Assembly Mounting Screw
Tank Strap to Mounting Bracket
30 GALLON TANK
Strap to Frame
Tank [viounting Bracket to Frame
37 and 64 GALLON TANKS
Gauge Assembly Mounting Screw ...........................................
Gauge Protector Top Cover Bolt ...........................................
Tank |>trap to Mounting Bracket ......... (Lower Bolt)..............
(Top Nut).................
Tank Mounting Bracket to Frame B o lt ...................................
50, 75 and 100 GALLON TANK
Gauge I Assembly Mounting Screw .................
Gauge!Protector Top Cover Bolt .................
Fuel T^nk Strap to Upper or Lower Mounting
Fuel Tpnk Cross Over Support to Tank
Mounting Bracket Bolt-Nut ........................
Fuel L
Fuel T ne
ink Support Bracket to Tank
Mounting Bracket
Fuel Tpnk Mounting Bracket to Frame
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL SUPPLEMENT