GMC Canyon diesel fuel leaking from high pressure pump after warranty replacement on GMC Canyon

Some GMC Canyon owners report experiencing diesel fuel leaks from the high-pressure pump following a warranty replacement. These leaks may indicate a malfunctioning pump, often accompanied by a whining noise during operation. Owners who have had their high-pressure fuel pump replaced due to previous catastrophic failures should ensure that the replacement was performed correctly to avoid further issues. Additionally, running the in-tank fuel pump dry can lead to contaminated fuel being circulated, which poses a risk of damaging the fuel system. To diagnose the source of the leak, it is recommended that owners run diagnostic tests on the fuel system. If the leak persists or if there is uncertainty about how to proceed, consulting a qualified service facility or dealership for further inspection and repairs is advisable.