1991 1999 ford explorer chilton User Manual

SPECIFICATION CHARTS
IAT and ECT sensor specifications chartClick to enlarge
Chilton® Automotive Information Systems. © 2004 Thomson Delmar Learning.
SPECIFICATION CHARTS 599 

BASIC FUEL SYSTEM DIAGNOSIS
When there is a problem starting or driving a vehicle, two of the most important checks involve the ignition
and the fuel systems. The questions most mechanics attempt to answer first, is there spark? and is there
fuel? will often lead to solving most basic problems. For ignition system diagnosis and testing, please refer to
the information on engine electrical components and ignition systems found earlier in this manual. If the
ignition system checks out (there is spark),...

FUEL LINES AND FITTINGS
General Information
Quick-connect (push type) fuel line fittings must be disconnected using proper procedure or the fitting
may be damaged. There are two types of retainers used on the push connect fittings. Line sizes of  3
/8
and  5
/16  in. diameter use a hairpin clip retainer. The  1
/4  in. diameter line connectors use a duck-bill clip
retainer. In addition, some engines use spring-lock connections, secured by a garter spring, which
require Ford Tool T81P-19623-G (or...

Hairpin clip fuel fitting installation
Click to enlarge
HOW TO USE THIS BOOK
604 REMOVAL & INSTALLATION 

Exploded views of the hairpin and duckbill clip type fuel fittings
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Duckbill Clip Fitting
REMOVAL & INSTALLATION A special tool is available from Ford and other manufacturers for removing the retaining clips. Use
Ford Tool T82L-9300-AH or equivalent. If the tool is not on hand, go onto step 2. Align the slot on
the push connector disconnect tool with either tab on the retaining clip. Pull the line from the
connector.
1. 
If the special clip tool is not available, use a pair of narrow...

Duckbill clip fuel fitting installation
Click to enlarge
Spring Lock Coupling HOW TO USE THIS BOOK
606 REMOVAL & INSTALLATION 

REMOVAL & INSTALLATION
The spring lock coupling is held together by a garter spring inside a circular cage. When the coupling is
connected together, the flared end of the female fitting slips behind the garter spring inside the cage of the
male fitting. The garter spring and cage then prevent the flared end of the female fitting from pulling out of
the cage. As an additional locking feature, most vehicles have a horseshoe-shaped retaining clip that
improves the retaining reliability of the spring lock...

Spring lock horseshoe-shaped retaining clip installation
Click to enlarge
Chilton® Automotive Information Systems. © 2004 Thomson Delmar Learning. HOW TO USE THIS BOOK
608 REMOVAL & INSTALLATION 

SEQUENTIAL FUEL INJECTION (SFI) SYSTEM
General Information
The Sequential Fuel Injection (SFI) system includes a high pressure, inline electric fuel pump mounted in the
fuel tank, a fuel supply manifold, a throttle body (meters the incoming air charge for the correct mixture with
the fuel), a pressure regulator, fuel filters and both solid and flexible fuel lines. The fuel supply manifold
includes 4, 6 or 8 electronically-controlled fuel injectors, each mounted directly above an intake port in the
lower...

harness.
FUEL SYSTEM SERVICE PRECAUTIONS
Safety is the most important factor when performing not only fuel system maintenance, but any type of
maintenance. Failure to conduct maintenance and repairs in a safe manner may result in serious personal
injury or death. Work on a vehicles fuel system components can be accomplished safely and effectively by
adhering to the following rules and guidelines.
To avoid the possibility of fire and personal injury, always disconnect the negative battery cable
unless...