Lycoming TEO-540-C1A Maintenance Manual page 116

Problem
Engine will not idle
unless the boost pump
is on (Cont.)
Low fuel pressure in
the fuel injector rails
and fuel pump
Engine will not shut
off
Low fuel flow
12-30
Page 86
Table 1 (Cont.)
Fault Isolation Guide
Cause
Fuel vaporizing in lines
Broken fuel pump drive
O-ring is not installed
and/or intact
Faulty power switches
Faulty wiring in a harness
Ignition switch faulty
Faulty ECU
Dirty fuel pump filter
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Corrective Action
1. Operate with cowl flaps in
the FULL OPEN position
and keep ground operation
to a minimum.
2. Operate with boost pump on
as necessary.
3. Complete a check of the
vent return line for
blockage. Clean if
necessary.
Replace the fuel pump per the
"Fuel Pump Replacement"
procedure.
All O-rings on the fuel pressure
regulator must be installed.
Replace the switches.
Replace the harness.
Complete a check for faults on
the ignition switch circuits.
Repair as necessary.
Replace the ECU.
Either remove and clean the
fuel pump filter with acetone or
MEK. Blow out with
compressed air and re-install
the fuel pump filter or replace
the fuel pump filter as per the
"Fuel Pump Filter Inspection"
procedure.
© 2018 Avco Corporation. All Rights Reserved
Ref.
73-10
73-10
AMM
72-70
AMM
72-70
73-10
November 2018