When the vane fuel pump dispenser fails

When the vane fuel pump dispenser fails, it may make oil gun will not get oil, then how should we respond? It can be divided into the following situations:
① vane pump relief valve can not be closed. Due to a foreign body (broken shrapnel, etc.) stuck in between the relief valve spool and valve seat, caused by the oil pump is always done in the loop and can not flow, maintenance should remove the valve, remove the valve seat foreign body;
② Because the pump with the rotor blades and the shrapnel long do high-speed operation, will wear due to fatigue, fracture, leading to vent vane pump increases, even when serious loss of pumping action, the pump should be clear debris and repair the damaged blade , shrapnel, re-install the new replacement;
③ storage tank calibration methods vane pump and oil separator pad bonding surface of pump breakdown or anti-loaded, can also cause the vane pump high-pressure chamber communicates with the low pressure chamber, resulting in the loss of the vane pump oil discharge function;
④ vane pump rotor and the rotor shaft loose, causing the shaft idle, this time in need of replacement repair rotor or vane pump.