Fuel System Repairs · Gauteng
Fuel System Repairs.
Injectors, Pumps & Contamination.
We diagnose and repair the whole generator fuel system across Gauteng, from contaminated diesel in the tank to lift pumps, filters, lines and injectors. Fuel faults are one of the most common reasons a standby set fails in an outage, so we test the fuel first and only replace the parts that have failed.
Callout fee waived when you accept our written quote. 1-year workmanship guarantee. See prices
- Fuel tested before parts
- Lift pump and injector work
- Fuel polishing and tank cleaning
- Open 24/7, arrive within 1 hour
The Service
Generator Fuel System Diagnosis & Repair Across Gauteng
We repair generator fuel systems across Gauteng, from contaminated diesel in the tank to the lift pump, filters, lines and injectors. Fuel faults hit standby sets hardest. Diesel breaks down as it sits, microbes grow into sludge and condensation adds water. Your set can pass every monthly test and still fail in a real outage, because a short test never asks the fuel system to deliver at load.
We test the fuel before we test the parts, because the condition of the fuel decides which repairs you actually need. New injectors fitted to a system still full of contaminated diesel fail the same way as the old ones. Our cost guide puts fuel pump repair or replacement at R1,800 to R4,500, and fuel system cleaning and polishing at R1,500 to R3,500.
Long-term contamination wears injectors. A worn or clogged injector cannot atomise fuel, so you get rough running, black smoke, low power and high fuel use. We test each injector for spray pattern, opening pressure and flow. We clean and reset the serviceable ones and replace worn injectors with matched units.
A failing lift pump loses delivery pressure gradually. The set may start and run on light load, then shut down when the full load arrives, or refuse to start once pressure drops below what the injection pump needs. We measure the lift pump output and fit a correct-spec replacement when it has failed.
We inspect the fuel lines on every fuel system repair. Cracked or hardened lines let air in, and air causes loss of prime and shutdowns that come and go. We pressure-test every connection and confirm it is leak-free before we close the job.
Fuel problem with your generator?
Call or WhatsApp 082 057 4605. We are open 24/7 and arrive within 1 hour when a fuel fault stops your set.
What We Fix
Common Fuel System Faults
01
Contaminated or degraded diesel
Diesel in a standby tank grows bacteria and fungus and turns to sludge over time. That sludge blocks filters and injectors and stops your set starting reliably.
02
Clogged or worn injectors
Injectors that cannot atomise fuel properly cause rough running, black smoke, lost power and heavy fuel use. We test the spray pattern and flow of each one.
03
Lift pump failure
A failing mechanical or electric lift pump starves the injection system. Your set starts hard, runs only on light load, or will not run at all.
04
Air in the fuel system
Cracked fuel lines, loose fittings or a failed injector return let air in. The system loses prime and the set shuts down under load without warning.
05
Water in the tank
Condensation puts water in your tank. Water speeds up diesel breakdown, feeds bacterial growth and corrodes injectors and pump parts.
06
Blocked fuel lines & fittings
Sludge and debris from contaminated fuel block supply lines and fittings, so the engine starves as soon as it takes load.
Our Repair Process
How we work through a fuel fault
- 01
Fuel quality assessment
We test the fuel and inspect the tank for water and sludge first, to establish whether the fuel itself is causing the fault.
- 02
System flow & pressure testing
We test lift pump output, fuel pressure at the injection pump and filter condition to find any restriction or pump failure along the way.
- 03
Injector testing & service
We test each injector for spray pattern, opening pressure and flow, then clean and reset it or replace it with a matched unit.
- 04
Fuel polishing or tank clean
We polish contaminated fuel or drain and replace it, flush and clean the tank where needed, and fit new filters before the set goes back on duty.
Standby Generators
Fuel Degradation Is the Silent Threat to Standby Units
A standby generator that only runs for monthly tests is the set most at risk from fuel problems. Short tests never cycle the whole fuel system, so microbes keep growing in the tank between runs and sludge builds up on the filters and injector tips.
By the time you notice, usually when the set fails to carry load in a real outage, the contamination is well advanced. We polish the fuel or drain and clean the tank, replace every filter and flush the system, then refill with fresh diesel treated against microbial growth.
Fuel quality testing
Before any component repair
Fuel polishing
Restore degraded diesel in-tank
Tank clean & flush
Remove sludge and water
Microbial treatment
Prevent future contamination
Common Questions
Fuel system repairs — questions
Can dirty diesel stop a generator from starting?
Yes. Water, sludge and a blocked filter will stop a diesel that otherwise cranks well. We check the filter and the fuel before we look at the injection pump.
Why does my diesel generator crank but not fire?
The usual causes are air in the lines, a blocked filter, a failed lift pump or a fuel solenoid that does not open. We test them in that order, starting with the cheapest fix.
Can stale petrol stop a generator?
Yes. Petrol left in the set between outages gums up the carburettor, so the engine will not fire, or it starts and surges. A carburettor clean usually fixes it.
Do you diagnose injector problems?
Yes. We investigate smoke, uneven running and poor load response, and test the injectors for spray pattern and opening pressure. We clear air and filter faults first, because they cause the same symptoms for far less money.
How much does a fuel system repair cost?
Our cost guide puts fuel pump repair or replacement at R1,800 to R4,500 and fuel system cleaning and polishing at R1,500 to R3,500. Your written quote gives the exact figure before we start.
Should I keep cranking a diesel that will not start?
No. Repeated cranking flattens the battery and overheats the starter. Check the tank is not empty, then stop and call 082 057 4605. We are open 24/7 and arrive within 1 hour.
Do you adjust gas regulators during a fuel visit?
No. A registered gas practitioner handles gas pipework, regulators and pressure. Our fuel system repairs cover diesel and petrol generators.
Still unsure what the fault is? Call or WhatsApp 082 057 4605 for onsite diagnosis.
Related Services
Other generator services
- Fuel Pump Repairs Lift pump and low-pressure supply
- Diesel Injector Service Spray, smoke and hard starting
- Contaminated Diesel Water, sludge and diesel bug in the tank
- Fuel Solenoid Repairs Run solenoid and fuel shutoff
- Generator Repairs Full repair service
- Generator Servicing Filters & full inspection
- Cranks But Won't Start Turns over, will not fire
- Diesel Generator Repairs Standby diesel fuel faults
Service Areas
Fuel system repairs across Gauteng
Fuel system repairs are available across all Gauteng areas including Johannesburg, Pretoria, Sandton, Midrand, Centurion, Randburg, Roodepoort, Kempton Park, Boksburg, Benoni, Germiston, Alberton, Fourways, and surrounding regions.
Free written quote
Need Fuel System Repairs?
Tell us the fuel, the kVA if you know it, and what the set does: no start, smoke, or a shutdown under load. Say when the tank was last filled. We reply with the next step and a written quote before any work.
- Call
- 082 057 4605
- Message us on WhatsApp
What happens next
- We reply with questions about the generator, or to book a visit.
- A technician comes to you. For a breakdown we arrive within 1 hour.
- The fault is diagnosed on site and you get a written quote. No work starts until you accept it.
Charlie, lead technician: Degree in Mechanical Engineering, Degree in Electrical Engineering, Diesel Plant Fitter. Generator specialists since 2000.