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?
