Volvo V70XC Cross country 1998 Owner's Manual page 159

1998 Volvo SV70
Fuel system cap, tank and lines and connections
The effectiveness of the fuel system to contain hydrocarbons is dependent largely on a leak-free system. Check for proper sealing of the gasoline filler cap which contains "O" ring type seals.
Fuel (line) filter
The fuel line filter is located next to the fuel pump. For proper functioning of the vehicle and its emission control systems, the fuel line filter should be replaced at 100,000 miles (160,000 km). The filter is replaced as one
complete unit. Replace more frequently if contaminated fuel is introduced into the tank (or if there is reason to suspect that this has occurred).
PCV system
The orifice nipple in the intake manifold and the filter at the end of the PCV hose in the air cleaner should be inspected every 60,000 miles (96,000 km). Check/replace rubber hoses at the same time.
Charge air cooler (Intercooler)
Turbo-charged engines employs a turbo-compressor to force air into the engine inlet manifold and a charge air cooler to cool the compressed inlet air. The resulting increase in air flow raises pressure in the intake
manifold by approx. 8.7 psi (over atmospheric pressure) and engine power output by approx. 50 horsepower over that developed by the normally-aspirated engine. The charge air cooler (which resembles a radiator) is
located between the turbo-compressor and inlet manifold.
Air cabin filter
Replace the air cabin filter with a new one every 20,000 miles (32,000 km). The filter should be replaced more often when driving under dirty and dusty conditions. The filter cannot be cleaned and therefore should always
be replaced with a new one.
pg. 122 Servicing (cont.)
Fuel System
The fuel system is all-electronic and is microprocessor-controlled. It can continually compensate for variation in engine load, speed and temperature to give the best economy and power. A mass air flow sensor measures
the inducted air. In thisway the system can make instantaneous adjustments for changes in air temperature or density, thus always assuring the best economy with the lowest possible exhaust emissions.
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