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4. VACUUM/PRESSURE PUMP (FIG. 1)
The Vacuum/Pressure Pump is accurate, robust and easy to use. The unit consists of a pump-body (A), moveable hanble (B) and a
gauge (C) which displays both vacuum (inHG / BAR) and pressure (PSI / BAR).
Pressure and vacuum modes can be selected via the Mode Selector (D) as follows:
FIG. 2.1 (Vacuum)
3.
For Vacuum Testing
: turn the Mode Selector (D) until the selection
arrow is aligned with operation arrow labelled “
IN
”
(Fig. 2.1)
FIG. 2.2 (Pressure)
4.
For Pressure Testing:
turn the Mode selector (D) until the selection
arrow is aligned with the operation arrow labelled “
OUT
”
(Fig. 2.2)
5. USING THE VACUUM/PRESSURE TEST KIT TO DIAGNOSE ENGINE FAULTS
Before condemning the engine management system for causino any particolar problem, remember that the engine’s mechanical
components must be in good condition for the engine to perform properly. A vacuum gauge can be used to check the mechanical
condition of an engine, however it is not foolproof.
By connecting the pump to a manifold vacuum port (this must be the engine side of the throttle butterfly) with the T connectors
provided, a check of vacuum can be conducted.
By examining the range of vacuum readings and the movement of the gauge needle in comparison to the pressure readings of a
normal engine running at idle (typically steady and between 16inHG and 22inHG), it is possible to diagnose a variety of faults*.
* This is by no means an exhaustive list of tests. The hand punp and adaptors can be used to test practically any component or
system that requires proper sealing, vacuum or pressure to operate.
6. TO TEST FUEL SYSTEM
The vacuum/pressure pump help sto identify a variety of faults on the different vehicle systems.
The kit also inclued reservoirs, hoses and adptors for bleeding brake and clutch systems.
When bleeding diesel fuel systems, it is recommended that the reservoir pot is used. Yjis creates a vacuum in the pot and the diesel
fuel in draw in. This may need to be completed a few times before the procedure is complete. Connect the pot and gauge between
the fuel filter and distribution pump.