GDI -
On-vehicle Service
GDI -
On-vehicle Service
13I-122
FUEL PRESSURE TEST
MEASUREMENT OF FUEL LOW PRESSURE BETWEEN
FUEL PUMP (LOW PRESSURE) AND FUEL PUMP
(HIGH PRESSURE)
1. Release residual pressure from the fuel pipe line to prevent
fuel gush out. (Refer to P. 13I-121)
2. Disconnect the high-pressure fuel hose at the fuel pump
(high pressure) side.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressure
in the fuel pipe line.
3. Remove the union joint and bolt from the special tool
(adapter hose) and instead attach the special tool (hose
adapter) to the adapter hose.
4. Install the special tool (for measuring the fuel pressure)
that was set up in step 3.
<When using the fuel pressure gauge set (special tool)>
(1) Install the special tool (for measuring the fuel pressure)
between the high-pressure fuel hose and the fuel
pump (high pressure).
(2) Install the fuel pressure gauge set (special tool) on
the special tool (for measuring the fuel pressure)
putting the gasket between them.
(3) Connect the lead wire of the fuel pressure gauge
set (special tool) to the power supply (cigarette lighter
socket) and to the MUT-
II
.
<When using the fuel pressure gauge>
(1) Install the fuel pressure gauge on the special tool
(for measuring the fuel pressure) putting a suitable
O-ring or gasket between them.
(2) Install the special tool which was set up in step (1)
between the high-pressure fuel hose and the fuel
pump (high pressure).
High-
pressure
fuel hose
Fuel pump
(high pressure)
MD998709
MD998742
Fuel
pump
(high
pressure)
Gasket
High-pressure
fuel hose
MB991637
Fuel pressure gauge
O-ring or gasket
MD998709
MD998742
High-pressure
fuel hose
Fuel pump
(high pres-
sure)
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