Chevrolet 10 Series 1970, Руководство по обслуживанию

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SECTION 8
FUEL TANK AND EXHAUST
CONTENTS OF THIS SECTION
Page
Fuel Tank (E x cep t w ith evaporative emission c o n t r o l ) .................. 8-1
Fuel Tank (w ith evaporative emission c o n t r o l ) ...................... .. 8-5
Exhaust S y s t e m .................................................................................... 8-6
FUEL TANK
(EXCEPT EVAPORATIVE EM ISSIO N CONTRO L)
INDEX
Page Page
General D e s c rip tio n ...............
Service O p e ra tio n s ..................
Draining Tank ....................
Gauge U nit or Fuel Strainer
Fuel T a n k .............................
8-1 Fuel Line S e r v i c e .............................................................................. 8-4
8-1 Frame Mounted - Fuel F ilter .......................................................... 8-5
8-1 Fuel Line Retainer Clip .................................................................. 8-5
8-2 Special T o o l s ......................................................................................... 8-10
8-2
GENERAL DESCRIPTION
A ll cab m odel trucks (except T ilt Cabs) have a 21 g a l­
lon (17.5 gallons Im p e ria l M easure) capacity (approx.)
fuel tank mounted behind the seat within the cab. The
tank is constructed of two s te e l sections, seam welded,
together. The f i l l e r neck extends through the le ft side of
the cab, at a convenient height fro m the ground. Excep­
tional stiffn ess is secured by the combination of the
w elded flan ges and depressed ribs in both the fron t and
re a r halves. The tank is bolted to the r e a r of the cab
and to the flo o r panel.
Fram e mounted tanks are located on the right side of
the chassis and lay lengthwise outside the fram e side r a il
on F o rw ard Control, 1-1/2, and 2 ton m odels.
On 1 ton m odels, the above inform ation also applies
except that the tank is mounted on the outside of the le ft
fra m e side r a il. A strong mounting of two m etal straps
anchor these tanks to mounting brackets which are bolted
to the fra m e side m em ber.
On 1/2 and 3/4 ton conventional and 4-w heel d riv e
m odels the tank is located to the re a r of the axle and be­
tween the side ra ils and envelopes the forw a rd edge of the
spare tir e . These tanks are supported by one or two stee l
straps which are held at eith er end by a hook into the side
ra il. M etal to m etal contact between tank and brackets
o r straps is prevented by the use of anti-squeak m ateria l.
Upper and lo w e r f i l l e r necks v a ry as to s ize , length and
shape, depending on m odel requirem ents. These necks
are treated so that rust w ill not fo rm and get into the
fu el system . L o w er f i l l e r necks are fir s t bolted o r r iv ­
eted to the tank, except on cab m odels, and then sweat
sold ered in place to elim inate any p os s ib ility of leakage
at this point.
A ll tanks are equipped with a vented f i l l e r neck cap.
A ll 40 through 60 S eries trucks incorporate a pressu re
r e lie f valve.
The fuel pickup pipe is built in teg ra lly with the tank
gauge unit, located at the top of the tank. A la rge area,
fin e-m esh screen is located on the bottom of the fuel
pickup pipe. This screen is designed to prevent the en­
trance of d irt or w ater into the fuel system , and operates
with a se lf-c le a n in g action.
Fram e mounted tanks consist of an upper and lo w e r
half, each with a wide flange and b affles which are
p ressed into the tank halves. The two tank sections are
seam welded at the flange around the entire tank to as­
sure leakproof construction.
Exceptional stiffn ess is
secured by the combination of the welded flanges and de­
p ressed rib s in both upper and lo w er tank sections. B af­
fle plates are in corporated to p rovide additional stiffn ess
and to prevent the surging of gasoline within the tank.
SERVICE OPERATIONS
D R A IN IN G FUEL TANK
If the fu el tank does not incorporate a drain plug, it
w ill be n ecessary to siphon fu el fro m the tank when
draining is needed. T h e follo w in g procedure is
recommended.
1. Obtain approxim ately 10 fe et of 3/8" I.D. hose and
cut a flap-type s lit 18" from one end. Make this
cut in the d irection of the sh orter end of hose (See
Figu re 1).
2. In sert a sm all pipe nipple (slig h tly la r g e r O.D. than
the hose I.D .) into the opposite end of hose.
CHEVROLET TRUCK SERVICE MANUAL