4.12
21901443 R02 - 2016 Gravely Atlas JSV3000 / JSV6000 EFI Service Manual
© Copyright Ariens Company
FUEL PUMP SERVICE
OPERATION OVERVIEW
An electric fuel pump assembly is used to transfer fuel to
the EFI system from inside the fuel tank. This assembly
includes the fuel pump, fuel filter, regulator and fuel level
sender. The pump is rated for a minimum output of 9.25
gal (35 L)/hr at 58 ± 2 psi (400 ± 14 kPa).
When the key switch is turned to "ON", the ECU
activates the fuel pump, which pressurizes the system for
start-up.
The ECU switches off the pump preventing the continued
delivery of fuel in these instances:
• If the key switch is not promptly turned to the "start"
position.
• If the engine fails to start.
• If the engine is stopped with the key switch "on" (as in
the case of an accident).
In these situations, the “check engine” light will
illuminate, but turn off after 4 cranking revolutions if the
system functions properly. Once the engine is running,
the fuel pump remains on to maintain fuel pressure.
FUEL SENDER TEST
1. Remove the fuel pump assembly from the fuel tank.
Refer to “Fuel Pump Replacement”, page 4.14
procedure.
2. Using an Ohm meter, measure the resistance of the
fuel sender as shown below.
3. Allow the sender float to sit in the empty position
and compare to specification.
Fuel Sender - Empty:
90 Ω ± 4.5 Ω
4. Slowly move the sender float to the full position and
compare to specification.
Fuel Sender - Full:
6 Ω ± 1 Ω
5. If the readings are out of specification, or if the
reading is erratic or LCD display “sticks”, check the
following before replacing the fuel pump assembly:
• Loose float
• Float contact with tank
• Bent float rod
6. If none of the conditions exist, the fuel sender
assembly is faulty. Replace the fuel pump assembly.
Refer to “Fuel Pump Replacement”, page 4.14
procedure.
FUEL PUMP TEST
If a fuel delivery problem is suspected, make certain the
fuel pump filter is not plugged, that the pump is being
activated through the ECU, all electrical connections are
properly secured, the fuses are good, and a minimum of
7.0 volts is being supplied. If during starting the battery
voltage drops below 7.0 volts, the ECU will fail to operate
the system.
FUEL SYSTEM
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