Incorrect
Manifold Vacuum
significantly affects
computer controlled
fuel injection system
operation and overall
engine performance.
Vacuum formed in the
intake manifold depends
on several things.
Engine components
such as: valves, valve
guides, valve springs,
pistons, and piston
rings can influence
vacuum readings. Other
engine performance
factors include valve
timing, manifold leaks,
ignition timing, and
restricted exhaust
systems.
Exhaust
Restriction?
Excessive
Back Pressure
in the exhaust can
affect the engine's
fuel system and engine
performance dramatically.
Large easy to read
dials and a full set
of adapters make it
easy to diagnose restricted
intake/exhaust systems.
How
Low Is Your Flow?
Pressure And Flow
are two different
measurements! An engines
fuel pressure can
be perfectly normal
while a low rate of
fuel flow exists in
the system. The Fuel
Zapp let's you zoom
in on the unknown
factor of flow. Measuring
fuel system flow should
be no less precise
than using a torque
wrench on head bolts
or a micrometer on
brake rotors. Besides
being an obvious safety
hazard, flowing gasoline
from an un-pressurized
fuel line into a graduated
container, timed by
a stopwatch, is not
an accurate way to
measure fuel systems
flow. A worn pump
may be able to provide
sufficient flow until
it must generate enough
torque to overcome
normal system operating
pressure.
FSA
Buying Guide
The Fuel Zapp is a top of the
line unit: high quality construction,
complete adapter kit, excellent
tests. Not all competitors can
match up. Here are some questions
to ask when deciding on a fuel
system tester:
1. Does the unit test gasoline
Fuel Systems? The Fuel Zapp does.
2. Does the unit test Flex Fuel
Systems? The Fuel Zapp does.
3. Does the unit test Diesel Fuel
Systems? The Fuel Zapp does.
4. What material is used for the
Main Body? The Fuel Zapp uses
steel (not plastic).
5. What material is used for the
Flow Tube? The Fuel Zapp uses
a shatter-proof polycarbonate
(not fragile glass).
6. What type of Fuel Line adapters
are included? The Fuel Zapp provides
high quality Hose Set (not just
an end Adapter Fitting Set).
7. Does the unit include a Fuel
Pressure Gauge? The Fuel Zapp
does.
8. Does the unit include a Vacuum
Gauge? The Fuel Zapp does.
9. Does the unit include a Exhaust
Back Pressure? The Fuel Zapp does.
10. Does the unit include any
software? The Fuel Zapp includes
a Fuel Volume Calculator software.
11. How long is the Warranty:
Fuel Zapp is 3 years (not 1 year).
12. How does it perform a Flow
Demand Test?
The Fuel ZAPP FSA always tests
flow against normal system pressure.
Some competitors use a BYPASS
valve and recommend measuring
peak flow by removing all restriction
(and pressure) to the flow of
fuel. As any good technician will
confirm, a return type fuel system
is always outputting peak flow
even at idle and testing fuel
system flow should always be performed
while pumping against normal system
operating pressure (A weak pump
may be perfectly able to provide
adequate flow until it has to
overcome system pressure). Return-less
type system peak flow can be tested
by commanding KOEO continuous
fuel pump operation with input
from the tank to the flow meter
and output from the meter back
to the tank while regulating normal
system pressure with the crimp
pliers included in the Fuel Zapp
kit.
Mechanical
Defect?
