Mityvac MV5545 FST PRO FUEL SYSTEM TESTER - Manual (Page 3)

Introduction
The Mityvac FST Pro Fuel System Tester is an advanced
diagnostic tool designed for troubleshooting and pinpointing
common automotive fuel delivery system malfunctions,
including:
• Failing fuel pump
• Faulty pressure regulator
• Blocked inline filter
• Blocked inlet strainer/sock
• Pinched or crushed fuel line
• Fuel contamination
• Fuel tank vortex
• Fuel system leaks
This manual focuses on the application of the FST to modern
electronic fuel injection (EFI) systems. However, it is equally
capable of diagnosing earlier fuel injection systems such as
throttle body injection (TBI), continuous injection (CIS) and even
pre-fuel injection carbureted systems. A separate low pressure
gauge is available from Mityvac for systems that operate below
15 PSI (100 kPa).
Safety Precautions
The use of this service tool requires the exposure of highly
flammable gasoline. To prevent fires, explosions and/or severe
injury, always apply extra precautions when diagnosing or
working on fuel systems.
The FST Pro is designed for servicing a variety of vehicles in a
safe, convenient manner. However, fuel delivery systems vary
widely between makes and models of vehicles, potentially
requiring additional steps or equipment to perform a proper
service job. The procedures outlined in this manual are to serve
as guidelines for the use of this equipment. In addition to these
guidelines, always follow the manufacturer’s recommended
procedures when servicing each unique vehicle. Use common
sense in the application of this tester; and do not attempt to
force a test on a fuel system for which this equipment is not
designed to perform.
This tester is designed for use on gasoline/petrol engines only.
It is safe for use with gasoline and most gasoline additives, but
is not compatible with diesel fuel or alternative/flex fuels that
contain ethanol.
• Always read carefully and understand instructions prior to
using this equipment
• Wear safety glasses at all times
• Operate the vehicle only in a well ventilated area, and away
from potential sources of flame or ignition.
• Prior to starting an engine, make sure all components of the
tester, body parts, and personal clothing are clear of rotating
engine components
• Avoid burns by remaining cautious of engine parts that may
become hot when the engine is running
• Never leave a vehicle unattended while testing
• Check and secure all fuel system connections before
starting the vehicle or activating the fuel pump
• Wear gloves and protective clothing to avoid the contact of
gasoline on skin. If contact occurs, immediately wash the
area and perform necessary first aid
• Always keep a fire extinguisher on hand when performing
fuel related diagnostics. Make sure the extinguisher is rated
for fuel, electrical and chemical fires
• Avoid spilling fuel on hot engine parts. Clean-up any fuel
spills immediately after they occur.
Specifications
Maximum Flow Capacity: 1.0 gallon/minute (3.8 liters/minute)
Maximum Rated Pressure: 200 PSI (1340 kPa) (13.8 bar)
Components, Service Parts
and Accessories
The Mityvac FST Pro combines the highest quality materials
and workmanship to create a durable, finely tuned diagnostic
tool, which with proper care will provide years of valuable
service. All components are designed and quality controlled
in the U.S.
Following is a list of standard components, service parts and
accessories relating to model MV5545. Components and
accessories are available from your local Mityvac distributor.
Service parts, warranty information and technical service
information are available at the contact information shown on
the front of this user manual.
Standard Kit Components
Model MV5545 includes the following high quality components:
• 3.5" (90 mm) diameter diaphragm style Pressure Gauge
- 0 to 120 PSI (0 to 8 bar) (0 to 800 kPa) scale of measure
- Push-button pressure relief valve
- 360° swivel hook
- Protective rubber boot
• Flowmeter Assembly
- Borosilicate glass variable area flowtube with protective
shield and precision aluminum float
- 3-way Flow Control Valve
- Fuel bypass port
- Male push-to-connect, quick-change coupler
w/ Schrader valve
- (2x) Male SAE J2044 quick-connects
- Replaceable faceplates with 0 to 1.0 gallon/minute
scale of measurement
- Protective rubber boot
• (2x) Replaceable flowmeter faceplates with 0 to 4 liters/
minute scale of measurement
• 1/8" (3 mm) ID x 6' (1.8 m) long Pressure Relief Hose
• 1/4" (6.5 mm) ID x 6' (1.8 m) long Bypass Hose
• (2x) Flowmeter Connection Hose
• (2x) Scissor Hose Clamp
• (2x) Hose Plug
• (6x) Quick-connect Replacement Clip
• Custom Storage Case
• Automotive Fuel System Test Adapters
(see Fuel System Test Adapters on page 6)
Form 824127 Page Number - 3