INSTALLATION
(1) (Refer to 14 - FUEL SYSTEM/FUEL INJ EC-
TION - WARNING) In st all the sea ling rin g on to th e
sensor (Fig. 14).
(2) Scr ew the sen sor in to the fuel rail. Coun ter-
hold the t hrea ded connection and tigh ten the sensor
to 18 lbs. ft. (25 N·m.) (F ig. 14).
(3) Connect the wiring har ness to t he sensor.
(4) In st all the mixing housing.
CAUTION: Care must be taken when installing the
engine cover. Assure the proper routing of the fuel
injector return fuel hose to the banjo bolt fitting in
the left rear corner of the cover. Failure to do so
may pinch or damage the hose causing fuel leakage
or a driveability concern.
(5) Connect nega tive bat tery cable.
FU EL PRESSU RE SOLEN OI D
DESCRIPTION
The fuel pr essu re solenoid is a ttached t o the rea r
of th e fu el ra il. A sea ling metal disc seals the valve to
the rail. The seal is n ot serviceable a nd looses it’s
sealing properties u pon remova l of the solenoid.
Therefor e, t he solen oid must be replaced wh en ever
it is r emoved from th e rail. The solenoid cont rols an d
mainta ins the ra il pressure constant along with a
control cur rent tr ansmitted by t he engine control
module (ECM) (Fig. 15).
OPERATION
High pr essure wh ich is present in th e fuel ra il
flows to t he ball sea t of the pressu re solenoid (F ig.
16). Th e specified pressure requ ired by t he system is
built up in the r ail by the fuel pressure solenoid
building up a magn etic force which corresponds to
this specific pressu re by mea ns of a cont rol curren t
from th e electronic con trol module (ECM) (F ig. 16).
This m agnet ic force equa ls a cer tain outlet cross sec-
tion at the ball seat of the va lve. The rail pressure is
alt ered as a result of the qua ntity of fuel which flows
off (Fig. 16). The current fu el pressu re is signaled by
the fuel rail pressure sensor t o t he engine cont rol
module (E CM). The controlled fuel flows ba ck along
the r etur n fuel line, int o the tan k.
In a de-energized st ate, the fuel pressu re solenoid
is closed as the sprin g for ce presses the ball int o the
ball seat (Fig. 16). When driving, the fuel pressur e
solenoid is constantly open (Fig. 16). When engin e is
st arted, the fuel pressu re solenoid is held closed by
magnetic force (Fig. 16). When drivin g, th e pr essure
of t he flu id counteracts the m agnetic force of th e coil
and the slight spring force (Fig. 16).
Fig. 15 FUEL PRESSURE SOLENOID
1 - FUEL PRESSURE SENSOR
2 - FUEL RAIL
3 - FUEL PRESSURE SOLENOID
Fig. 16 FUEL PRESSURE SOLENOID OPERATION
1 - BALL SEAT
2 - SPRING FORCE
3 - MAGNETIC FORCE
4 - COIL
5 - FUEL PRESSURE SOLENOID
6 - HIGH PRESSURE SUPPLY
14 - 40 FUEL INJECTION VA
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