Engine - DeWalt DW168F Manual

4. Remove the main jet ( and e-tube (
I4)
5. Replace the main jet with the main jet specified for high altitude service. This high
altitude main jet comes in a high altitude carburetor adjustment package with new
carburetor bowl and fuel shut-off solenoid O-rings.
6. Reassemble carburetor in reverse order. Replace carburetor bowl O-ring and solenoid
O-ring if necessary.
7. Turn on fuel valve and inspect for fuel leak.
TroubLESHooTING
noTE: Make sure the engine has a good ground before troubleshooting.

Engine

sTaRTInG pRoBlEM
pRoBlEM possIBlE CausE soluTIon
Engine will 1. On/Off switch in Place On/Off switch in ON position.
not start, Off position
stay running
2. Low or no fuel Add fuel.
or only runs
3. fuel valve in Place fuel valve in ON position.
when choked
Off position
4. Low oil or no oil Add oil.
5. Choke in wrong For cold starts, choke must be in CLOSED position.
position
On pull ring chokes, pull ring all the way out.
On lever chokes, move lever all the way in direction
of arrow.
If in doubt, remove air cleaner and visually verify
that choke plate is closed and completely blocking
entrance.
6. Check fuel Ensure fuel is clean and fresh. If problem continues
condition refer to Fuel system under Maintenance.
7. Spark plug wire Ensure that spark plug wire is tightly connected to
(is loose on plug spark plug
8. Low oil shutdown Make sure oil level is up to full mark, refer to oil
(LOS) under Maintenance. If problem continues refer to
Inspection/oil level switch under Governor/Low
Oil Shutoff.
9. Check for spark Perform Ignition Test under Perform Test Checks.
10.Examine spark Perform spark plug Condition Check under
plug condition Maintenance.
11. Improper valve Reset valve clearances (see Maintenance
clearance Standards)
12. Cap not venting After performing Fuel Check, if problem still contin-
ues:
Run engine with gas cap loose or removed to see
if engine still stalls. If it does not stall, gas cap is
not venting. noTE: California models of generators
and pressure washers have non-venting gas caps
for emissions. Venting air is supplied from carbon
canister.
If gas cap is not venting properly the fuel filter
could be dirty or blocked, sediment cup full of
debris or fuel valve could be clogged.
with a flat head screwdriver.
X2),
pRoBlEM possIBlE CausE soluTIon
Engine will 13.Gas tank/fuel
not start, filter does not
stay running allow flow of gas
or only runs because it is dirty
when choked or blocked
(continued)
14. Sediment cup
full of debris (fuel
valve)
15. fuel valve
clogged
16. Evaporative
system not
venting fresh air
to tank to replace
gas as being
used. (California
Units)
17
There are 2 types of gas tank/fuel filter designs
used:
One requires an in-line filter located in the fuel line
between the fuel valve and the carburetor. The other
has a tube shaped filter above the fuel valve inside
the gas tank. This second design does not require
an in-line filter.
To check the gas tank/fuel filter, place fuel valve
lever in the closed (horizontal) position, remove fuel
line from fuel valve and place fuel valve lever in the
on (vertical) position to check flow to a catch pan.
If there is flow and the engine has only the internal
tank filter, the filter is not the problem.
If there is no flow, , place fuel valve lever in the
closed (horizontal) position, remove fuel valve to
access tube filter, clean it and reassemble. To check
in line filter disconnect fuel line from carburetor and
place fuel valve lever in the on (vertical) position
to check for fuel flow. If no flow or weak, replace
fuel filter. See Service bulletin Sb06109 regarding
filters. noTE: Air Compressors and Pressure
washers have a fuel valve in the carburetor. On
these remove drain screw on carburetor bowl to
verify flow.
Place the fuel valve lever in the closed (horizontal)
position, remove fuel line from fuel valve and
place fuel valve lever in the on (vertical) position to
check flow to a catch pan. If no flow or weak, clean
sediment cup, refer to Fuel system to clean the
sediment cup. with sediment cup removed from fuel
valve, place fuel valve lever in the ON position to
verify flow from cup area into a catch pan. This will
confirm fuel valve itself is not clogged.
Remove valve from generator tank and with valve
in the OPEN position use compressed air to blow it
clean or soak it in solvent. Or replace valve.
Ensure no obstructions, kinks or blockages are in
evaporative system hose connected to bottom of
gas tank and to charcoal canister on lower frame.
Disconnect hose from canister that goes to tank.
with gas gap removed, blow through hose. Air
should flow freely. If not find obstruction and correct.
noTE: On California versions of pressure washers,
evaporative system hose exits from top of gas tank.