First, check the pump surface and pressurized water chamber (also known as the volute) inner surface is uneven corrosion. Convex surface rust will pump water decreased by 7% -8%; overhaul just sandpaper or steel brush and iron wheel polished smooth, you can make it work in the fuel or electricity consumption reduced by 9% -14%.

          Second, check the sealing ring gap is increased. According to the prosecution trial, when the radial impeller 4 mm gap increases, the pump will be reduced by 10% the amount of water; just add the line back to the clearance of asbestos factory regulations overhaul with an organic adhesive, you can make fuel pump at work or power consumption is reduced by 10% -12%.

          Third, check the water pressure chamber and impeller axis are coincident. According to the test, when the pressure of the water chamber and impeller axis deviation angle is greater than 2 mm or 2 degrees, the water pump will be reduced by 5% -6%; overhaul, just carefully measured, carefully identify the location of the axis coincides with reliable equipment, you can make the pump work in the oil or electricity consumption by 6% -7%.

          Fourth, check the blade installation angle is consistent. When the blade mounting angle is inconsistent, the water pump will be reduced by about 5%; overhaul, with the amount of quasi-point scale, the installation of the position and is secured, you can make fuel or electric pump at work, consumption reduced by 5% -6%.