On all carbureted Volvos, the fuel filter is to be removed and cleaned every six months or 6000 miles (9662 km). The filter is located integral with the fuel pump in the driver's side of the engine. To remove the filter on B20B engines, loosen the retaining screws and lift off the cover. To remove the filter on B30A engines, unscrew the plug and filter assembly on the side of the fuel pump. The filter can be cleaned in a low-volatility, petroleum-based solvent such as kerosene,but replacement is better. After replacing the clean element, install the cover and retaining screw on B20B engines, and after installing the plug and filter assembly on B30A engines, run the engine at fast idle and check for fuel leaks. Replace the gasket if any fuel seepage is evident.Mechanical Fuel Injection
See Figure 1
On these models the fuel filter is located under the hood on the left side of the firewall. It is a large cylinder with threaded couplings on both ends.
These models are equipped with a mechanical Continuous Injection (CI) system, which maintains constant pressure within the lines, even when the engine is not running. When changing the fuel filter, have a container handy to catch the fuel which will squirt out or wrap a rag around the fittings before loosening them. Do not smoke while changing the filter and do not attempt to change the filter when the engine is warm. The filter is removed by carefully unfastening the lines and removing the filter from its attaching bracket. When installing a new filter, make sure that arrow on the filter points in the direction of fuel flow.
ALL MODELS THROUGH 1981
See Figure 2
The filter is located beneath the car, next to the fuel tank. Prior to removal of the filter, clean the fuel lines and the surrounding area to prevent dirt from entering the fuel systems during the change. Remove the fuel lines from the filter one at a time and pinch each shut to prevent fuel from spilling out. Discard the old filter and replace it with a new one. When installing the new filter, make sure that the arrow on the filter points in the direction of flow. After installation, run the engine at fast idle and check for leaks.
On some 6-cylinder models, the fuel filter is located with the fuel pump in a swingdown holder: remove the single attaching screw at the rear of the holder and allow it to hang down before attempting to remove the fuel filter.
See Figures 3, 4, 5, 6, 7 and 8
These fuel filters are found inside a metal bracket under the left rear of the car. Before changing the fuel filter, loosen or remove the gas cap; this will equalize pressure within the system. Use two wrenches (this prevents the filter from turning) to disconnect the fuel lines at the filter. Remove the bolts holding the bracket to the car and carefully lower the assembly.
Use a rag wrapped around the fittings to minimize fuel spillage. Have a container ready when loosening connections. The fuel in the system (not the tank) will drain out.
Remove the clamp which holds the filter and transfer the clamp to the new filter, paying attention to the direction of flow as shown by the arrow on the new filter. Fuel flows FROM the tank TO the engine. Install the new filter with its clamp onto the bracket and connect the fuel lines. Make sure the copper seals are correctly installed and that all connections are tight. Reinstall or tighten the gas cap.
FUEL TANK PICK-UP SCREEN/FILTER SERVICE
See Figure 9
All models through 1975 are equipped with a fuel pick-up screen which is accessible after removing the countersunk plug in the bottom of the fuel tank with a drain plug wrench. For 1970-72 models, Volvo does not recommend regularly scheduled screen service. On 1973 and later models the screen should be removed and cleaned every 12,000 miles (19,324 km). Even though Volvo does not recommend cleaning the pick-up screen on 1970-72 models, it would be wise to remove and clean the screen periodically to insure sufficient fuel flow.
Pull the filter off the pick-up tube and soak it in solvent. When replacing the filter on the tube, make sure that it is centered on the tube so as not to restrict the fuel flow.
Beginning in 1976, some models are equipped with an in-tank pump which has a fuel filter attached to its bottom. This filter is accessible by removing the fuel tank pump cap and withdrawing the pump and filter. The filter should be replaced every 60,000 miles (96,618 km). All 1977 and later models except the diesel are equipped with this type of filter.
Some 1976 models are equipped with a fuel tank pick-up screen.
The diesel engine uses a canister type fuel filter which for models built 1982 and earlier should be replaced every 15,000 miles (24,155 km) under normal driving conditions, and more often under hard driving or severe climate conditions. The filter is located on the left side rear of the engine. For diesel cars built after 1983, Volvo recommends replacing the fuel filter at 30,000 mile (48,309 km) intervals.
- Position an oil filter band wrench as high as possible on the fuel filter and loosen the filter.
- Unscrew and remove the filter, being careful not to allow the fuel in the filter to spill out.
- Apply diesel oil to the rubber gasket on the new filter and install the filter.
- Tighten the filter by hand until the rubber gasket makes a tight fit, then tighten the filter 1 / 4 turn more by hand.
Do not use a band wrench or any other tool to tighten the fuel filter.
- Start the engine and check for fuel leaks around the filter gasket. If the rubber gasket is not seated properly, air will be sucked into the system and adversely affect engine operation.
BLEEDING THE FUEL SYSTEM
Bleeding the fuel system is not required. After the filter or other fuel system parts have been replaced, simply crank the engine until it starts and accelerate a few times until the engine runs smoothly. This is also true if the car has simply run out of fuel; no bleeding is required.
DRAINING THE DIESEL FILTER
Diesel fuel tends to collect water, especially if the vehicle is routinely driven with a low or nearly empty fuel tank. Since oil-in this case diesel fuel-floats on water, the canister type filter will allow the accumulated water to sink to the bottom of the filter. It is important to drain the canister at regular intervals. Volvo recommends the water be drained every 7500 miles (12,077 km). It is such a simple procedure that is well worth doing every time you change the engine oil and filter.
- Position a collection pan under the drain screw (2) at the bottom of the filter.
- Loosen the bleeder screw (1) several turns.
- Loosen the drain screw (2) and allow the filter to drain until only clean fuel flows out, then tighten the drain screw.
- Tighten the bleeder screw.