Performance Testing

The performance testing of fuel pump plunger includes electrical characteristics, accuracy, the tolerance of high temperature, low temperature, pressure as well as leakage, durability and others working conditions testing. These conditions of each fuel pump plunger will be tested before our fuel pump plungers are sent to customers.



Above are the tests needed to be done after the fuel pump plungers are finished producing. However, regular checking also very important to keep the fuel pump plunger perform well.



In order to make sure the fuel pump plunger works normally, there are some parts of fuel pump plunger needed to be checked regularly and before installing to fuel pump plunger.

① Check whether there is deformation, cracking, thread damage, quenching, leakage and rust in the guide sleeve, spring, gasket and tight cap of the fuel pump plunger. The tight cap of the fuel pump plunger must be replaced after being disassembled for more than 5 times, as shown in the following.

② Replace the tight cap of the fuel pump plunger and the copper gasket of the fuel pump plunger

③ Check whether the gap between the fuel pump plunger needle and the fuel pump plunger shell is within the standard range and whether it reaches the standard for use

④All parts should be examined for wear under a microscope at least 20 times larger

⑤ fuel pump plunger tight cap deformation, cracking, thread damage, quenching, leakage, will lead to black smoke vehicle cap, fuel pump plunger damage.

⑥fuel pump plunger opening pressure greater than or less than the specified range may cause fuel pump plunger damage.
⑦ Failure to replace wearing parts in time during maintenance may lead to fuel pump plunger damage.



These are some precautions you need to know to maintain an fuel pump plunger. If there are more questions about fuel pump plungers and other problems, you are welcomed to contact us, dieselpumpplunger.com will do the best to help you solve your problems.