Vortech 1996-2000 5.7L Vortec Truck/SUV User Manual

Page 17

P/N: 4GM020-010

14AUG00 V 1.2

(Vortec 350-2 )4GM

11. SUPPLEMENTARY FUEL PUMP AND HARNESS

87A

(+) FUEL PUMP

SOLID GREY WIRE IN FUEL
PUMP HARNESS (RUNNING
ALONG THE DRIVER’S SIDE
FRAME MEMBER)

RELAY WIRING

SCHEMATIC

(+) BATTERY LUG

GROUND

A. Separate the factory 3/8” fuel rail supply line at the

compression fitting junction underneath the ve-
hicle just to the rear of the fuel filter.

B. Attach the supplied 1/2” hose to 3/8" compression

fitting to the line coming from the fuel tank.
Connect the supplied length of 1/2” fuel hose to
the 1/2” fitting previously installed and the re-
maining end to the supplied inline pump. Secure
with a #8 hose clamp.

C. Attach the discharge end of the fuel pump to the

line running into the fuel filter (use the supplied
5/16" hose to 3/8" compression fitting). Position
the pump in such a way that the inlet and dis-
charge hoses are not kinked or restricted and
maintain a gentle bend. The pump inlet is the most
critical as far as restriction is concerned and may
be trimmed if necessary to hold a smooth radius.
Make sure that all fuel pump hose connections are
secure.

D. Mount the fuel pump to the frame using the 1.5”

adel clamp. Position the clamp and drill a #16
hole. Secure using a #12 hex head screw.

Using the existing hole in the frame and supplied
#10 hardware, mount the relay to the vehicle
frame (see

Fig. 11-b

and

Fig. 10-b

in section 10).

The relay mounting hole will also work well as a
grounding point for the pump and relay. Scrape
away the frame coating and paint to provide a
proper ground connection. Make sure that the
pump and relay grounding terminals are mounted

under

the relay as opposed to

on top

so that a

metal-to-metal contact will be made.

Fig. 11-a

Fig. 11-b