Fuel System Repairs.
Injectors, Pumps & Contamination.

Fuel system faults are responsible for a significant proportion of generator failures, particularly in standby units that are infrequently run. Diesel fuel degrades over time — bacteria and fungi grow in the tank, producing sludge that blocks filters and injectors. Water condensation accelerates this process. A generator that starts reliably during monthly test runs can fail completely when called upon during an actual outage, because the fuel system was never fully loaded.

ProService Generator Repairs diagnoses and repairs fuel system problems across all diesel generator types throughout Gauteng. We begin with a fuel quality assessment before moving to component testing — because the condition of the fuel itself determines what repairs are actually needed. Replacing injectors into a system still carrying contaminated fuel produces the same outcome as the original fault.

Injector problems are a common result of long-term fuel contamination. Worn or clogged injectors cannot atomise fuel correctly, producing incomplete combustion that manifests as rough running, black smoke from the exhaust, reduced power output, and high fuel consumption. We test each injector for spray pattern, opening pressure, and flow rate. Where injectors are serviceable, we clean and reset them. Where they are worn beyond specification, we replace them with quality matched units.

Lift pump failures are another frequent cause of fuel starvation. A failing mechanical or electric lift pump reduces fuel delivery pressure progressively — the generator may start and run under light load but shut down when a full load is applied, or may fail to start entirely if delivery pressure drops below what the injection pump requires. We test lift pump output and replace failed units with correct-spec replacements.

Fuel line condition is inspected as part of every fuel system repair. Cracked, hardened, or deteriorated lines introduce air into the system — air ingress causes loss of prime and intermittent shutdowns that are difficult to diagnose without a systematic approach. All connections are pressure-tested and confirmed leak-free before the job is closed.