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01424L
USING THE AUTOMOTIVE VACUUM & PRESSURE TEST KIT TO TEST FUEL
SYSTEM
There are several uses for the BGS vacuum/pressure tester regarding the fuel system.
These range from bleeding the fuel system to testing pressure regulators. By using the
appropriate connector from the selection included in the kit, most vacuum pipes can be
interrupted. When bleeding diesel fuel systems, it is recommended that the reservoir pot
is used. This creates a vacuum in the pot and the diesel fuel is drawn 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.
Fault
NORMAL ENGINE
WORN VALVE GUIDES
BURNED OR LEAKING VALVES
STICKING VALVES
PISTON RING LEAKS
BLOWN CYLINDER HEAD
GASKETS
INCORRECT IDLE AIR/FUEL
MIXTURE
LATE IGNITION / VALVE TIMING
SW-Stahl GmbH
An der Hasenjagd 3
D-42897 Remscheid
Indicator (Comparative to normal engine at idle
16-22inHg
Reads steady at between 16inHg and 22inHg
Reads lower than normal and fluctuated rapidly in a
range
of
approximately 3inHg. As the rpm
increased, the reading will become increasingly
steady
Will fluctuate between low and normal at regular
intervals
Will demonstrate rapid and intermittent drop in
vacuum pressure
Will be low constant and demonstrate a rapid leap
following a quick throttle opening and closing. The
vacuum reading at idle will be low but steady at
approximately 12inHg to 16inHg. Increase the
engine speed to 2000 rpm and close the throttle
suddenly and the vacuum should increase 2inHg to
5inHg above its low steady reading. A smaller
reading may indicate faulty rings
At idle the reading will fluctuate between a normal
and a low reading. The vacuum will drop
approximately 10inHg from the normal reading and
return to normal each time the defective cylinder or
cylinders reach lining point
Rich mixture will read as a slow up and down
movement over a range of around 4inHg-5inHg.
Lean mixture appears as a drop over the same
range
Steady low vacuum reading at idle indicates late
ignition or valve timing or a uniformly close setting
of the valve lash
Tel. +49 (0) 2191 / 46438-0
Fax +49 (0) 2191 / 46438-40
E-Mail: info@swstahl.de
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