What causes fuel pump problems? How to detect it?
Over time, as an important fuel supply equipment, fuel dispensers have gradually become an indispensable part of daily life for many industries and individuals.
However, like any mechanical equipment, oil dispensers can develop various problems and challenges over time.
These problems may not only lead to a decrease in refueling efficiency but may also pose a potential threat to safety.
Therefore, it becomes crucial to understand and prevent these problems.
Among them, the fuel dispenser pump will have the following problems: no fuel supply, insufficient fuel supply,
leakage, increased noise and vibration, inability to separate oil and gas, and oil leakage from the oil drain pipe.
1. No oil supply or insufficient oil supply
Oil pipelines, flow meters, explosion-proof sensors, solenoid valves, oil pipes, and fuel nozzles may all cause a fault. The reason why the fuel pump is so bad is mainly because the negative pressure does not meet the requirements. If the negative pressure does not meet the requirements, it may be that the inlet vacuum of the oil pump is small and the suction lift is not enough, so the oil cannot be sucked. Secondly, there may be oil leakage in the fuel pump. The oil leakage may be caused by the excessive gap between the vane pump rotor and the stator tangent, the relief valve is not tightly closed the valve core is stuck, or the float valve seat may be the cause. If the sealing is not tight, the outside air will penetrate into the pump.
1）The motor does not rotate, reverse, or rotate too slowly, or the V-belt is slipping or not.
2） Check whether the filter connection is leaking, whether it is too dirty and whether there are any abnormalities in the exhaust pipe.
3）Whether the blades are too worn or damaged, replace them if so.
4 ）Whether the relief valve is stuck, not closed tightly, or loose, and whether the oil outlet valve is rusted.
One is internal leakage, which is the leakage of oil flowing from the high-pressure area to the low-pressure area under the action of pressure, blade wear, and gear wear inside the pump.
The second is external leakage, which means oil leakage outside the system, oil seal failure caused by over-tightening of the relief valve or over-tightening of the V-belt; damage or failure of sealing gaskets and O-rings.
3. Increased noise or vibration
1）External reasons for the tanker: The horizontal distance between the underground oil tank and the tanker is too long and there are too many bends; the inside of the oil pipeline is not clean; the oil quality is poor.
2）Causes of the tanker itself: the bottom valve opening is too small; the filter is too dirty; the relief valve spring is too tight or stuck; the gap size problem is related to the rotor shaft and blades.
4. Oil and gas cannot be separated
Turbid oil, problems with bellows and lower pipeline valves, joints, etc.
Maintenance method: Check whether the oil pipe is leaking. Check whether there is oil in the low-pressure chamber of the fuel pump. If there is no oil, the oil level will slowly drop after filling up, indicating oil leakage.
The filter cover is not tightly sealed, the bellows connection is not tightly sealed,
the oil return valve is not closed tightly, and the oil outlet valve is stuck.
5. Oil leaking from the exhaust pipe
The oil level in the oil tank is higher than the height of the oil and gas separator.
1 ）Whether the oil return float assembly cannot float. The main symptoms are that the oil return valve cannot be opened, the float assembly is damaged, the lever is broken, etc. This causes the pressure in the normal pressure chamber to rise and emerge from the exhaust pipe. To clear the oil return valve, repair or replace the float component.
2） Whether the air outlet hole of the high-pressure communication pipe is too large. If it is too large, the oil will directly enter the normal pressure chamber without having time to return to the low-pressure chamber from the oil return valve.
Check whether the high-pressure communication pipe connection is not tightly sealed or has oil leakage.