Pretrip Inspection and Daily Maintenance tank(s) to more than 95 percent of liquid ca- pacity. Remove the air hose and tighten the fuel supply line. 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. 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. If the engine is equipped with a priming pump, do the following: IMPORTANT: To prevent fuel loss or entry of air into a fuel line, make sure that all fuel line connections are tight. Unlock and operate the engine priming pump plunger until resistance is felt.
18.5 On vehicles equipped with dual tanks and single suction and return lines (with cross- over line), prime the fuel system if needed. 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. 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. If the engine is not equipped with a priming pump, do the following: 19. If equipped, check the transmission oil cooler for debris and for leaks. Remove the fuel tank cap.
Remove debris and repair leaks as needed. Loosen the fuel supply line at the fuel trans- fer pump. 20. If so equipped, inspect the fifth wheel and check it for adequate lubrication. 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. WARNING Check to be sure that the trailer is securely con- nected to the tractor. Failure to achieve complete 9.10