Husqvarna T525 Workshop Manual page 37

Repair instructions
Pressure testing the carburettor
Pressure testing should be carried out with the
carburettor fully assembled. The test must always
be done after the carburettor has been repaired,
but can also be carried out when troubleshooting
before the carburettor is taken apart.
Test 1
See Figure 44 and carry out the following check:
1. Connect pressure tester to the carburettor fuel
inlet.
2. Lower the carburettor into a beaker of water.
3. Pump up the pressure to 20 kPa.
4. No leakage is permitted. If a leakage occurs
refer to the table below.
Leak in
Diffuser jets
Leak in the impulse pipe
Ventilation hole above
metering unit
Test 2
1. Plug the connections to the fuel inlet.
2. Create a vacuum to the purge nipple on the
carburettor. No leakage is permitted. In the
case of leakage, leakage spray can be used
even it if is difficult. Try and identify where
the spray is sucked in. It can be used to
show leakages in main jets, idling needles,
measuring cover gaskets and measuring
diaphragms.
Fault with
Needle valve
Pump diaphragm
Control diaphragm
Fig 44
37
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