Engines - Poor Fuel Performance

90volvo07
MODEL GROUP NUMBER

200 and 700 23 136

TITLE

NEW DIESEL FUEL FILTER - ALL


MARKET DATE

US and Canada August 1990
REFERENCE: TP 30420/1 (ENGLISH); ENGINE D24 DIESEL
TP 30571/1 (ENGLISH); ENGINE D24 TURBO-DIESEL TP 31514/1 (ENGLISH); DIESEL EMISSION CONTROL ALL DIESEL MAINTENANCE SERVICES MANUALS

New fuel filter for diesel engines

Lesser-quality diesel fuel can cause diminished engine performance and increased black exhaust smoke.

Lower-quality diesel fuel and/or paraffin-based precipitants can cause blockage of the fuel filter. This is especially true of 'summer fuel' used at low ambient temperature.

Blockage of the fuel filter can create a vacuum in the fuel hose leading from the filter to the injection pump. This can lead to a condition known as fuel cavitation (foaming). Cavitation will alter injection timing causing a decrease in engine performance, as well as an increase in black exhaust smoke.

Confim that all hoses and connections between the filter and fuel tank are secure. If all connections are secure, install new fuel filter, p/n 3547862-7.


Note: Fuel filter replacement is included as part of every 30,000 mile (48,000km) interval maintenance service. Draining the fuel filter of condensate must also be carried out at recommended intervals (see maintenance service manuals).

If installing the new filter is ineffective in reducing smoke emissions, follow procedures in TP 31514/1.


The following is provided for information only:

Maint. Oper. No. Labor Description Time Allowance

233 426 fuel filter, replace 0.1 hr.