What Causes the Fuel Pump to Stop Prematurely When Refueling?

1 Answers
KayleeAnn
07/30/25 8:37am
The following are the reasons why the fuel pump stops prematurely when refueling: 1. Product quality issues: The fuel tank's return pipe is too narrow, causing air inside the tank to spray outward during refueling, which triggers the pump to stop. This is also a major factor for fuel overflow. Another scenario occurs in hot weather when the fuel inside the tank splashes due to pressure, leading to premature pump stoppage. 2. Design issues: Poor venting performance of the fuel tank during refueling; inadequate fuel tank refueling tests. The venting performance is related to the fuel tank's liquid level control valve or liquid level pipe, which determine how much fuel can be filled. When the fuel level reaches the pipe opening, the refueling venting circuit gets blocked by fuel, causing the fuel level to accumulate in the refueling pipe and trigger the pump to stop. Additionally, poor venting performance in the fuel tank's exhaust pipeline can also cause this problem.
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