148 EMISSION CONTROLS AND FUEL SYSTEM
buretor. While this line is disconnected,
check the fuel filter.
2. Run a piece of fuel-resistant rubber hose
from the line to a graduated container.
3. On engines with standard ignition sys
tems, ground the secondary coil wire. On en
gines with the HEI distributor, disconnect the
BAT connector from the coil terminal.
4. Crank the engine. Fuel should be
pumped into the container at a rate of 1 pint
in 30 seconds.
5. Remove the added hose and container
and connect a fuel pressure gauge to the fuel
line. Crank the engine and read the highest
pressure obtained on the gauge. See the
Tune-Up Specifications chart in the Tune-Up
chapter for the proper fuel pump pressure
range.
If the pump failed the tests of either step 4
or 5, replace the pump as previously out-
lined. If the pump checked okay, remove the
pressure gauge and reconnect the fuel line to
the carburetor. Reconnect the ignition wir-
ing as originally connected.
Electric Fuel Pump
An electric, impeller-type fuel pump is used
on all 1982-84 Corvettes. The pump is de-
signed to deliver a constant flow of fuel to the
throttle body fuel injection units. The fuel
pressure is regulated at the pressure regula-
tor and compensator units, both of which are
integrated with the throttle body injection
units.
The pump is mounted inside the fuel tank
as part of the fuel gauge sending unit. The
pump can be replaced independently of the
sending unit.
TIGHTEN TO
5
N ' m
(45
IN.
I B S . )
REMOVAL AND INSTALLATION
1. Disconnect the battery cables at the
battery.
2. Remove the fuel filler door and bezel.
3. Remove the fuel filler neck seal and
drain hose.
4. Disconnect the lines and electrical con
nectors from the sending unit/pump assem
bly, and remove the screws which retain the
assembly.
5. Remove the sending unit/pump assem
bly and the gasket.
6. Separate the pump from the sending
unit.
7. Installation is the reverse of the pre
vious steps. DO NOT connect the battery
until all other steps have been completed.
TESTING
NOTE: A
special fuel pressure gauge (Kent-
Moore J-29658) is required to safely per-
form this test.
1. Remove the air cleaner assembly and
plug the vacuum connection(s) at the TBI
unit.
2. Remove the fuel tube which connects
between both TBI units.
NOTE:
Use two line wrenches of the ap-
propriate sizes to disconnect each fitting;
one wrench to hold the large fitting, the
other to loosen the smaller fitting.
CAUTION: A
small amount of fuel will be
released from the connections.
3. Install the fuel pressure gauge between
the two TBI units.
4. Turn the ignition switch ON and check
for fuel leakage at the gauge arrangement. If
leakage is noted, turn the ignition switch OFF
and correct the leak.
5. Start the engine and read the fuel pres-
Electric fuel pump and gauge sender assembly-
1982
Fuel pressure gauge used to test the fuel pres-
sure on 1982, TBI models
GASKET
