6-2-7-proverka-raboty-obratnogo-klapana.html
6.2.7. Check of operation of the return valveRemove a vacuum hose.
ATTENTION
Thus it is not necessary to disconnect the return valve from a vacuum hose.
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Check operation of the return valve, using the vacuum pump.
ATTENTION
If the return valve is faulty, replace it assembled with a vacuum hose.
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