Harbor Freight Tools 93547 - Manual (Page 4)

Page 4 For technical questions, please call 1‑800‑444‑3353. SKU 93547
Setup Instructions
1. Park the vehicle in a well‑ventilated
area. If in a garage, park the car
so that the exhaust pipe faces
out the garage entrance. Leave
garage door open at all times.
2. Place the transmission in Park/Neutral
and set the vehicle emergency brake.
Operating Instructions
Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of
this document including all
text under subheadings therein
before set up or use of
this product.
Fuel Pump Pressure Test
1. Relieve the fuel line pressure from the
vehicle fuel system.
Refer to the vehicle manufacturer’s
service manual for instructions
on relieving pressure from the
fuel line, testing procedures and
connection points, and normal
fuel pump pressure readings.
2. Disconnect the pump fuel
output line at the pump.
3. Use the various Adapters included
and Rubber Hose (2) to connect the
Vacuum / Pressure Gauge (1) directly
to the fuel pump.
Use a small amount of pipe compound
or pipe thread seal tape (not supplied)
on the connection threads to prevent
leaks. Tighten using a wrench (not
supplied).
WARNING! Make sure
all connections are tight
to avoid fuel leaks.
4. Start the engine and leave at idle
speed, and immediately check for
fuel leaks. If fuel leaks are found,
turn engine off and fix leaks.
5. Read the Vacuum / Pressure Gauge
(1) for the correct pressure.
6. Turn off the engine. The current
reading should hold for one or two
minutes before going down to zero.
7. Wrap a cloth around the hose
connection point before relieving
the pressure from the fuel line and
remove testing components.
8. Reconnect vehicle’s fuel
line to the pump.
9. Wipe up any spilled fuel.
Dispose of fuel‑soaked rags
in a fireproof container.
10. Start the engine and immediately
check for leaks. If fuel leaks are
found, turn engine off and fix leaks.
11. Clean and store testing components.
Fuel Pump Vacuum Test
1. With the engine off, disconnect the
fuel pump inlet line that comes from
the fuel tank. Have a towel ready
to wipe up any spilled gasoline.
2. Connect the Vacuum / Pressure Gauge
(1) to the fuel pump inlet connector.
Use the Rubber Hose (2) and the
various adapters that fit the pump
inlet connector. Do not kink Rubber
Hose. Do not allow air leaks.
3. Start the engine and immediately view
the Vacuum / Pressure Gauge (1).
If the gauge pointer rises to 10 IN/
Hg (the red zone), before the pump