Fuel Pressure Solenoid - Dodge Sprinter 2006 Manual

14 - 40 FUEL INJECTION
INSTALLA TION
(1) (Refer t o 14 - F UE L SYSTE M/F UE L INJ E C-
TION - WARNING) In st a ll t h e sea lin g r in g on t o t h e
sen sor (F ig. 14).
(2) Scr ew t h e sen sor in t o t h e fu el r a il. Cou n t er-
h old t h e t h r ea ded con n ect ion a n d t igh t en t h e sen sor
t o 18 lbs. ft . (25 N·m .) (F ig. 14).
(3) Con n ect t h e wir in g h a r n ess t o t h e sen sor.
(4) In st a ll t h e m ixin g h ou sin g.
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) Con n ect n ega t ive ba t t er y ca ble.
FU EL PRESSU RE SOLEN OI D
DESCRIPTION
Th e fu el pr essu r e solen oid is a t t a ch ed t o t h e r ea r
of t h e fu el r a il. A sea lin g m et a l disc sea ls t h e va lve t o
t h e r a il. Th e sea l is n ot ser vicea ble a n d looses it 's
sea lin g pr oper t ies u pon r em ova l of t h e solen oid.
Th er efor e, t h e solen oid m u st be r epla ced wh en ever
it is r em oved fr om t h e r a il. Th e solen oid con t r ols a n d
m a in t a in s t h e r a il pr essu r e con st a n t a lon g wit h a
con t r ol cu r r en t t r a n sm it t ed by t h e en gin e con t r ol
m odu le (E CM) (F ig. 15).
Fig. 15 FUEL PRESSURE SOLENOID
1 - FUEL PRESSURE SENSOR
2 - FUEL RAIL

3 - FUEL PRESSURE SOLENOID

OPERA TION
H igh pr essu r e wh ich is pr esen t in t h e fu el r a il
flows t o t h e ba ll sea t of t h e pr essu r e solen oid (F ig.
16). Th e specified pr essu r e r equ ir ed by t h e syst em is
bu ilt u p in t h e r a il by t h e fu el pr essu r e solen oid
bu ildin g u p a m a gn et ic for ce wh ich cor r espon ds t o
t h is specific pr essu r e by m ea n s of a con t r ol cu r r en t
fr om t h e elect r on ic con t r ol m odu le (E CM) (F ig. 16).
Th is m a gn et ic for ce equ a ls a cer t a in ou t let cr oss sec-
t ion a t t h e ba ll sea t of t h e va lve. Th e r a il pr essu r e is
a lt er ed a s a r esu lt of t h e qu a n t it y of fu el wh ich flows
off (F ig. 16). Th e cu r r en t fu el pr essu r e is sign a led by
t h e fu el r a il pr essu r e sen sor t o t h e en gin e con t r ol
m odu le (E CM). Th e con t r olled fu el flows ba ck a lon g
t h e r et u r n fu el lin e, in t o t h e t a n k.
In a de-en er gized st a t e, t h e fu el pr essu r e solen oid
is closed a s t h e spr in g for ce pr esses t h e ba ll in t o t h e
ba ll sea t (F ig. 16). Wh en dr ivin g, t h e fu el pr essu r e
solen oid is con st a n t ly open (F ig. 16). Wh en en gin e is
st a r t ed, t h e fu el pr essu r e solen oid is h eld closed by
m a gn et ic for ce (F ig. 16). Wh en dr ivin g, t h e pr essu r e
of t h e flu id cou n t er a ct s t h e m a gn et ic for ce of t h e coil
a n d t h e sligh t spr in g for ce (F ig. 16).
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
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