is dissolved in the liquid propane and forms into gra-
nules as the fuel is vaporized. Remove regulator front
cover and diaphragm assembly (see Figure 6-29) to
check for dirt or oil deposits.
If
granules are
embedded in the Vitton rubber of the secondary
valve, wash the valve and seat clean.
Regulafor
Test:
The regulator may be bend tested
using compressed air and a simple automobile fuel
pressure gauge. Use the following procedure to test.
FILTER ELEMENT
GASKETS
FIGURE 6-30. REGULATOR TEST
FIGURE 6-31. FUEL FILTER
1. Attach the pressure gauge to the test port on the
back of the regulator as shown in Figure
6-30.
2. Attach a pressure hose to the inlet opening and
open the air pressure valve.
3.
If the primary seal is sound, the gauge should
read approximately 1-1/2 psi
(10.3
kPa) and the
pressure should remain constant.
A
fluctuating
pressure reading indicates a bad primary seat.
4. Close the air pressure valve and observe the pres-
sure gauge. The pressure should remain con-
stant. If the pressure reading drops, the secon-
dary
seat
is
leaking.
If the regulator does not pass either test,
it
must be
re bui
It
or replaced.
Fuel
Filter
The fuel filter (see Figure6-31) removes solid impuri-
tiessuch as rust orscale from the LP-gas before they
can clog the regulator orcarburetor.
A
magnet within
the filter housing traps iron
or
rust particles while a
filter element traps non-magnetic particles. The fuel
filter operates at container pressure and must be
carefully assembled to prevent leakage. Use the fol-
lowing procedures to disassemble and clean:
Remove the four capscrews and lock washers
that secure the filter bowl to the filter body.
Separate filter bowl from filter body and discard
the O-ring seal.
Remove nut and washer from center stud and pull
out the filter element.
FS-1614
4. If filter element is clogged, wash element in kero-
sene and blow dry with low pressure
(35
psi/241
kPa) compressed air. Replace filter element if
damaged.
5.
Wipe the center stud magnet clean
of
any rust
or
scale particles that have collected.
6.
Install clean filter element using two new gaskets
and securely tighten center stud nut.
7. Place a new O-ring in the filter bowl sealing
groove.
8.
Align reference mark on filter bowl with reference
mark on filter body and install four capscrewsand
four lock washers. Tighten capscrews to 56 to 74
in-lbs (6.5 to
8.3
Nom) torque. When fuel system
is pressurized, check filter for leaks.
6-24
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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