What are the reasons why the fuel pump of a diesel vehicle cannot pump oil?

1 Answers
Katie
07/29/25 6:08pm
Here are the reasons why the fuel pump of a diesel vehicle cannot pump oil and the inspection methods: 1. The one-way valve is not tightly sealed: The pressure cannot be built up because one or both of the one-way valves are not tightly sealed, causing leakage. 2. Air is sucked into the fuel transfer pump: There is a seal failure in the low-pressure pipeline between the fuel transfer pump and the fuel tank, causing air to be sucked into the fuel transfer pump. 3. Inspection method: You can remove the inlet pipe of the hand fuel pump, then connect another pipe to a bucket with some oil to see if oil comes out. If oil comes out, clean the fuel line and check if there is any air leakage in the inlet pipe. If no oil comes out, there is a problem with the hand fuel pump.
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