Toro Workman 3000 Series Service Manual page 432

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.
Vacuum
1. Vacuum fuelock filter
2. 3/8 in. flare to 1/4 in. fitting
3. 1/8 in. NPT to 1/4 in.
4. 1/4 in. NPT nipple fitting
5. Starting valve
Liquid Propane Conversion Kit
13
Signal
Port
9
6. 1/8 in. NPT brass fitting (45_)
7. 5/32 in. vacuum hose
8. Wye vacuum connector
9. Vaporizer-regulator
10. 1/4 in. to 1/4 in. fitting
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
is 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
11
Fuel
Outlet
10
4
6
14
12
Figure 5
Page 11 – 8 Rev. D
Fuel
Inlet
3
14
7
5
11. 5/32 in. vacuum hose
12. 5/32 in. vacuum hose
13. 3/8 in. NPT to 5/8 in. elbow
14. 1/4 inch NPT elbow
Workman 3000/4000 Series
2
1
Vacuum
Signal
Port
8