P/N: 4GC020-010
©2001 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
15SEP01 V1.1
(88-95 GM Lt Trk(4GC))
5. SUPPLEMENTARY FUEL INJECTION COMPUTER AND RELATED SYSTEM - Cont'd.
Fig. 5-a
5
NOTE: Factory fuel return line must be
attached to original fitting on TBI unit.
THROTTLE SPACER BLOCK
PLACE 3/8" ADAPTER FITTING
INTO TBI FUEL INLET
USE 3/8" ADAPTER FITTING
AT STOCK FUEL FILTER
CONNECT TO FITTING ON
DISCHARGE PLENUM
VORTECH FUEL PUMP
(-) GROUND
SUPPLEMENTAL
INJECTORS
VORTECH
SUPPLEMENTARY FUEL
INJECTION COMPUTER
BROWN WIRE IGN COIL (-) NEG.
BLACK WIRE GROUND
VORTECH
FUEL PRESSURE
REGULATOR
RELAY
TERMINAL #87
25A
4WD
FUSE BOX
FUSE BOX
INJECTOR CONNECTORS ARE
INTERCHANGEABLE AND
REVERSIBLE
UPPER
FITTING
LOWER
FITTING
SOLID GRAY WIRE IN FUEL
PUMP HARNESS (RUNNING
ALONG THE DRIVER'S SIDE
FRAME MEMBER
(+) FUEL PUMP
(+) BATTERY LUG
RELAY WIRING
SCHEMATIC
87a
87
30
8586
GROUND
3/8” HOSE
3/8” BARB
1/4 NPT
FEMALE
5/16”
BARB x
1/4 NPT
FEMALE
5/16”
HOSE
