3-14.3. FUEL LINES - MAINTENANCE INSTRUCTIONS (Cont).
Check for loose or faulty connections. Also check for improper fuel line connections such as a fuel pump
suction line connected to the short fuel return line in the fuel tank which would cause the pump to draw air.
Presence of an air leak may be detected by observing the fuel filter contents after the filter is bled and
the engine is operated for 15 to 20 minutes at a fairly high speed. No leak is indicated if the filter shell is full
when loosened from its cover. If the filter shell is only partly full, an air leak is indicated.