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EN – 63
Code 27: Low Fuel Pressure
Low fuel pressure is usually a result of an empty fuel tank,
but could also be from a clogged fuel filter or faulty fuel
pump.
Attempt engine start and check for trouble code re-
occurrence after each of the following steps. Refer to
Operator’s Manual for engine starting instructions.
1. Check fuel level and fill fuel tank completely if not
already full.
2. Check fuel lines to ensure there are no leaks or kinks.
3. Check inline fuel filter for debris and blockage. See
Figure 159.
4. Check fuel pump wiring to ensure it is connected
correctly. See Figure 160.
See Figure 161.
5. Remove the fuel pump wires, turn ignition key to the
ON position and measure the fuel pump voltage.
Voltage output should measure 7.2 – 8.4 volts DC.
IMPORTANT: Fuel pump voltage MUST be measured
within 30 seconds of the ignition switch being turned to the
ON position.
If voltage measures less than 7.2 volts, check the battery
voltage by probing the green wire on the ECU 12-pin
connector. See Figure 162.
• If low voltage or no voltage is present, replace the
ECU.
• If voltage is present, inspect the green wire between
the 12-pin connector and throttle body for a pinched
or broken wire. If the wire has no damage, replace
the throttle body assembly.
• If voltage measures 7.2 – 8.4 volts, turn ignition key
to OFF position, reconnect fuel pump wires and turn
key back to ON position. Fuel pump should make a
“humming” noise.
If fuel pump is silent, the pump may have failed. Check fuel
pump:
1. Drain fuel from fuel system and tank. See Draining
Fuel System on page 7.
2. Remove pump from tank.
3. Reconnect pump wires.
4. Turn the ignition key to the ON position and listen for a
“humming” noise.
If fuel pump is silent, replace fuel pump.
If voltage is within range and fuel pump is operating
normally, the fuel pressure sensor is defective. Replace the
throttle body assembly. See Figure 167.
CAUTION: AVOID INJURY. Fuel lines are
pressurized; wear safety glasses.
Figure 159
Inline Fuel Filter
Figure 160
Fuel Pump Wires
Figure 161
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