Ford 1997 Aerostar Workshop Manual page 11

1997 Aerostar/Ranger
Section 10-01: Fuel Tank, Filters, Lines and
Electric Fuel Pump
DESCRIPTION AND OPERATION
Fuel Pump, Electric — Ranger
The multiport fuel injection (MFI) system uses a fuel tank (9002) and a fuel pump and sender assembly. The
fuel tank has an internal pump cavity where the fuel pump and sender assembly rest. This design provides
satisfactory operation during extreme vehicle maneuvers and steep vehicle climbing with low tank fill levels.
The fuel pump (9350) is mounted on the fuel pump and sender assembly inside the fuel tank. This assembly
includes a check valve which is in the outlet of the fuel pump. The function of this valve is to maintain
pressure in the system after the vehicle is shut down. The pressure retention helps prevent long cranks and
hot starting problems. This fuel pump is capable of supplying 60 liters (15.9 gallons) of fuel per hour at 310
kPa (45 psi). The fuel pump has an internal pressure relief valve which limits the maximum fuel pump
pressure to 850 kPa (125 psi). This only takes effect if there is a system blockage, causing system pressure
to rise too high. The system pressure is controlled by a pressure regulator on the engine (6007).
The fuel pump is protected at its inlet by a nylon pickup element. This nylon element filters dirt and
contaminants which could plug or damage the internal pump components while at the same time allowing
passage of small quantities of water which may accumulate within the fuel tank sump.
The electrical system has a fuel pump control relay controlled by the powertrain control module (PCM)
(12A650), which provides power to the fuel pump under various operating conditions. When the ignition
switch (11572) is in the OFF position, the contacts of the PCM power and fuel pump relays are open.
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKA1009.HTM~gen~ref.HTM
1997 Aerostar, Ranger, Equipped with 2.3L, 3.0L, and 4.0L
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Gasoline Engines Workshop Manual
Page 1 of 3
2011-04-29