Primary And Secondary Jet Pumps; Fuel Filter; Fuel Pressure Regulator; Fuel Sender Strainers - Suzuki XL7 2007 Service Manual

1G-4 Fuel System:

Primary and Secondary Jet Pumps

The primary jet pump (1) is located in the primary fuel
tank module. Fuel pump flow loss, caused by vapor
expulsion in the pump inlet chamber, is diverted to the
primary jet pump and the secondary jet pump (2)
through a restrictive orifice located on the pump cover.
The primary jet pump fills the reservoir of the primary
fuel tank module.
The secondary jet pump (1) creates a venturi action
which causes the fuel to be drawn from the secondary
side of the fuel tank, through the transfer pipe, to the
primary side of the fuel tank.

Fuel Sender Strainers

The strainers act as a coarse filter to perform the
following functions:
• Filter contaminants
• Separate water from fuel
• Provide a wicking action that helps draw fuel into the
fuel pump
Fuel stoppage at the strainer indicates that the fuel tank
contains an abnormal amount of sediment or water.
Therefore, the fuel tank will need to be removed and
cleaned, and the filter strainer should be replaced.

Fuel Filter

The fuel filter (1) is located in the primary fuel tank
module. The paper filter element traps particles in the
fuel that may damage the fuel injection system. The filter
housing is made to withstand maximum fuel system
pressure, exposure to fuel additives, and changes in
temperature.

Fuel Pressure Regulator

The fuel pressure regulator is integrated into the fuel
filter cover on the primary fuel tank module. The fuel
pressure regulator is a diaphragm-operated relief valve
and uses a spring with a preset tension and a stainless
steel ball inserted into a precision ground seat in order to
regulate fuel pressure. The fuel pressure regulator also
has a T-joint that diverts the needed fuel to the fuel rail
with the unused fuel dropping back into the reservoir of
the primary fuel tank module. A software bias
compensates the injector on-time because the fuel
pressure regulator is not referenced to manifold vacuum.
The injector pulse width varies with the signal from the
mass air flow (MAF)/intake air temperature (IAT) sensor.
This type of fuel pressure regulator is not serviceable.
With the engine running at idle, the system fuel pressure
at the pressure test connection should be between 380-
410 kPa (55-60 psi). With the system pressurized and
the pump OFF the pressure should stabilize and hold. If
the pressure regulator supplies a fuel pressure which is
too low or too high, a driveability condition will result.