Service Manual

Troubleshooting
With the exception of the fuel system, a gasoline engine
converted to run on LP gas operates as a gasoline one.
When looking for the source of a engine malfunction, it
is important to eliminate all other possible causes that
are not associated with the fuel system (see Trouble-
shooting in Chapter 3 – Liquid Cooled Gas Engine).
If the fuel system is not operating properly, take the fol-
lowing steps to determine the cause:
1. Look for obvious causes of malfunction such as an
empty fuel tank, a shut fuel tank cutout valve, or a dis-
connected or loose fuel hose.
2. Make sure there are no air leaks in the fuel system.
The LP gas fuel system operates using negative pres-
sures. Make sure all components and hoses are se-
cured tightly
. Check for fuel leaks with soapy water.
3. Make sure filter screen in the vacuum fuelock–filter
i
s not clogged or dirty (see Replace Filter Screen in Vac-
uum Fuelock–Filter).
4. Use Testing LP Gas Fuel System procedures to de-
termine the malfunctioning component
2
1
11
13
9
4
3
14
10
14
6
5
7
8
12
Fuel
Inlet
Fuel
Outlet
Signal
Port
Signal
Port
Vacuum
Vacuum
Figure 5
1. Vacuum fuelock filter
6.
1/8 in. NPT brass fitting (45_) 11. 5/32 in. vacuum hose
2. 3/8 in. flare to 1/4 in. fitting
7.
5/32 in. vacuum hose 12. 5/32 in. vacuum hose
3. 1/8 in. NPT to 1/4 in.
8.
Wye vacuum connector 13. 3/8 in. NPT to 5/8 in. elbow
4. 1/4 in. NPT nipple fitting 9.
Vaporizer-regulator 14. 1/4 inch NPT elbow
5. Starting valve 10.
1/4 in. to 1/4 in. fitting
Liquid Propane Conversion Kit Page 11 – 8
Rev. D
Workman 3000/4000 Series