What are the reasons for the fuel pump not supplying fuel?

1 Answers
DelPeter
07/30/25 3:38am
The reasons for the fuel pump not supplying fuel include excessive clearance between the inner and outer rocker arms; broken rocker arm; ruptured pump diaphragm; poor sealing of the inlet and outlet oil valves, etc., all of which can cause poor fuel supply from the fuel pump. Below is an introduction to troubleshooting the issue of the fuel injection pump not supplying fuel: 1. The causes of the fault are: no fuel in the tank; clogged diesel filter or fuel line; fuel transfer pump not supplying fuel; air present in the fuel supply system; broken plunger spring in the fuel injection pump; fuel injection pump plunger stuck and unable to operate; ruptured sealing copper gasket of the delivery valve assembly or broken spring. 2. Troubleshooting methods: fill up with diesel; replace the diesel filter element and clean the fuel line; inspect and repair the fuel transfer pump; remove air; replace the plunger spring in the fuel injection pump; inspect the fuel injection pump plunger; replace the sealing copper gasket or spring of the delivery valve assembly.
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