ISUZU NPR66 4HF1 VACUUM PUMP HOSE 8943390730 8-94339073-3

ISUZU NPR66 4HF1 VACUUM PUMP HOSE belongs to engine system. The oil return pipe is generally connected to the pressure reducing valve next to the fuel injector. Its main function is to provide a channel for the excess fuel of the diesel generator to return to the fuel tank, which can relieve gasoline pressure and reduce fuel consumption. The oil return pipe may seem inconspicuous, but it actually plays an important role in ensuring the normal operation of the diesel generator.