Spectrum 3.0L GM - Page 31

31
Step Action Value(s) Yes No
6
 Connect a calibrated 0-5” PSI pressure gauge to the pri-
mary pressure test port of the Regulator.
 Make sure the manual shut-off valve is open and turn the
ignition to ON.
 Crank the engine and observe the pressure gauge.
Does the pressure gauge indicate the proper primary fuel
pressure?
2.0–4.0
PSI
Go to Step
(7)
If NO
pressure
was indi-
cated, Go
to Step
(14)
If LOW
or HIGH
pressure
was in-
dicated,
Go to
Step
(15)
7
LPG is a gaseous fuel and requires higher secondary igni-
tion voltages than gasoline fueled engines. Check the
ignition system for proper ignition secondary voltage output
with J 26792 or equivalent.
Remove the spark plugs and check for the following:
 Correct plug type for LPG application.
 Wet electrodes (oil fouling)
 Cracks
 Wear
 Improper gap
 Burned electrodes
 Heavy deposits
Were any faulty conditions found in the ignition system
check?
Correct
the faulty
condition
and
Go to Step
(20)
Go to
Step (8)
8
Perform a leak-down test on the engine.
Are all cylinder leak-down test results within specification?
<10%
leakage
Go to Step
(12)
Repair
the en-
gine as
neces-
sary and
Go to
Step
(20)
9
 Turn OFF the manual fuel shut-off valve.
 Start the engine and let it run until it dies.
 Remove the LPG Temperature Sensor from the Regula-
tor (DO NOT disconnect the electrical connector).
 Inspect the inside of the low-pressure fuel supply hose
for heavy-end deposits.
Are there any deposits built-up in the low-pressure fuel
supply hose?
Go to Step
(16)
Go to
Step
(10)