tank(s) to more than 95 percent of liquid ca-
pacity.
18.4 On vehicles equipped with a single tank,
prime the fuel system, if needed. On ve-
hicles with dual tanks, go to the next sub-
step.
If the engine is equipped with a priming
pump, do the following:
Unlock and operate the engine priming
pump plunger until resistance is felt.
Push the plunger in and tighten it by hand.
Start the engine. If it does not start, more
priming is needed. Once the engine has
started, it may run rough. If this occurs, run
the engine at low idle until it runs smoothly.
If the engine is not equipped with a priming
pump, do the following:
Remove the fuel tank cap.
Loosen the fuel supply line at the fuel trans-
fer pump.
Partially cover the fuel tank opening with
your hand. Using an air hose, apply no more
than 5 psi (35 kPa) air pressure to the fuel
tank and look for a constant fuel flow at the
loosened fuel supply line.
Remove the air hose and tighten the fuel
supply line.
Start the engine. Once the engine has
started, it may run rough. If this occurs, run
the engine at low idle until it runs smoothly.
IMPORTANT: To prevent fuel loss or entry of
air into a fuel line, make sure that all fuel line
connections are tight.
18.5 On vehicles equipped with dual tanks and
single suction and return lines (with cross-
over line), prime the fuel system if needed.
Use the same procedure provided in the
previous substep for vehicles equipped with
a single tank. Do the procedure on the tank
equipped with the supply line.
19.
If equipped, check the transmission oil cooler for
debris and for leaks.
Remove debris and repair leaks as needed.
20.
If so equipped, inspect the fifth wheel and check it
for adequate lubrication.
WARNING
Check to be sure that the trailer is securely con-
nected to the tractor. Failure to achieve complete
Pretrip Inspection and Daily Maintenance
9.10
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