Holley Truck Avenger
Carburetor Install
The jeepfan.com 78 CJ-5 Gets a
new Carb
page 1
For 11 years this 78
CJ-5 ran a Holley 2bbl Pro-Jection throttle body
fuel injection system. The system was
rather simple and worked well. The trail
advantages of the TBI were obvious on hills and
bounces, the disadvantages were the computer
controls and unpredictable failures.
Some issues over
the years were mostly fuel pumps. The
problems experienced were most likely due to the
old rusty fuel tank.
 Electric
fuel pumps don't deal well with rust and after
three bad pumps it was time for a poly tank.
Another failure point was a throttle position
sensor, expensive little device that was easily
replaced.
As the years
clicked by more failures were just a matter of
time. Holley no longer makes this model
and parts are expensive. Also, the
complexity of the system makes trail diagnosis
difficult and "limping" home is not easy.
 Several years ago
Holley answered the cries of the off-road crowd
and created the Truck Avenger 4bbl Carburetor.
This carb originated from the 4160 series and
features spring loaded needle and seats and a
unique crossover vent tube to prevent fuel
spilling and flooding. Holley claims the
carb can handle climbs up to 40 degrees, side
hill maneuvers up to 30 degrees, and steep
descents up to 30 degrees. For more
details and reader reviews see...Holley
Truck Avenger Carburetor Review
Installation
The old Pro-Jection
system needed to be removed from the Jeep.
computer, throttle body, and a wiring harness
was to be carefully removed.
With the TBI
system removed and finally the spread-bore to
square-bore adapter the intake was ready to
receive the new carb. Note: The Jeep
was already equipped with an Edelbrock Performer
4bbl intake manifold. This manifold will
accept this Holley carb with no special
adapters.
A
set of carburetor studs were installed to help
maintain a good seal and save the aluminum
threads in the intake. A small amount of
lock-tite was added to keep the studs in place.
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