Vortech Engineering GM 7.4 Instruction Manual download pdf (Page 14)

P/N: 4GC020-010

15SEP01 V1.1

(88-95 GM Lt Trk(4GC))

D. Mount the additional fuel pump to the inner side

of the frame rail beneath the driver's side floor.

Use the shorter hose provided to help locate the

pump the correct distance from the filter. This

hose has an adapter fitting on the filter end.

Secure the pump to the frame and hose with the

clamp and fastener provided. (See

Fig. 5-a

E. Mark and drill a 3/16" hole in the frame near the

fuel pump to mount relay and wiring harness.

Mount relay with supplied #10 hardware.

F. From relay terminal #85, tap the yellow wire into

the solid gray wire in the harness running along

the driver's side frame member. Use the sup-

plied scotchlock.

G. Connect the short red wire from relay terminal

#87 to the (+) terminal on the fuel pump.

H. Connect the longer black wire from the (-) termi-

nal at the fuel pump to a clean ground.

I. Connect the short black wire from relay terminal

#86 to a clean ground (relay screw mount works

well).

J. Connect the long red wire from relay terminal

#30 to a (+) battery lug located in the engine

compartment.

K. Plumb the pump to the supplementary injectors

as per the schematic on page 5. Much of this

assembly has been done by Vortech.

L. Plumb the new pressure regulator and outlet,

routing the regulator to the throttle body inlet

using the adapter fitting and O-ring.

M. Route the Vortech SFIC wiring harness and

vacuum line through the firewall. Mount the

SFIC unit inside the vehicle beneath the steer-

ing column using the Velcro

strips provided.

N. Connect the wires for the Vortech SFIC. Attach

the black wire to ground. Connect the red to the

"4WD" fuse location in the stock fuse block (this

location is also found on 2WD trucks) with the

special adapter provided (on 1995 models, the

fuse box containing the "4WD" fuse is located

inside the vehicle on the left hand side of the

dashboard). Connect the brown wire to the

negative side of the ignition coil tach pickup

(loose male connection located on coil har-

ness).

5. SUPPLEMENTARY FUEL INJECTION COMPUTER AND RELATED SYSTEM - Cont'd.

NOTE: Make sure all small holes are aligned and

not plugged with gasket sealer when in-

stalled.

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Vortech Engineering GM 7.4 Instruction Manual Page 14

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