Since the introduction of Mechanical Injection systems in the late 60s
automotive engineering and environmental restrictions have forced
manufacturers into producing more environmentally friendly vehicles,
and this has led to a natural progression into Electronic Fuel and
Engine Management. The result, a more fuel efficient engine producing
optimum economy combined with smooth performance while retaining
The heart of the fuel injection system is the main fuel supply and the fuel pump
needs to operate at 100% for the injection system to function correctly.
So , why are we talking ‘Fuel Pumps’?
Well, the purpose of this message is to ensure that we maximise our driving
enjoyment and reduce maintenance expense by taking note of the
Fuel & Fuel Tank Contamination
Fuel Injection pumps are by design, manufactured to close (tight) tolerances
to produce the desired high fuel pressure. Minute particles of contamination
ie. water, rust or dirt entering the pump will prove fatal, causing permanent
damage to the fuel pump.
Pumps are designed to run on fuel available from normal filling stations.
Any additive or any alternative performance fuels are not recommended.
Low Fuel Levels
People who consistently drive on reserve fuel levels run also the risk of failure,
An injection pump operates at approximately 5000 revs/minute and relies on
fuel to lubricate and cool the moving parts.
Remember, next time you drive on reserve fuel, pump damage may be occurring.
Fuel supplied by the petrol station can be contaminated, and this dirty fuel is just
waiting at the bottom of your tank!
Pump Failed - Overheated!
The above events result in the pump overheating over weeks or months, followed by
final failure, and low fuel levels will also not help with the cooling process of the pump.
Blocked Fuel Filter.
Always ensure that the Fuel Filter is maintained regularly. Fine contamination
and fuel wax will restrict fuel flow causing backpressure on the fuel pump and
restricting its natural function. This results in fuel cavitation followed by
progressive pump damage and resulting in failure.
To conclude, Original Equipment Fuel System components are designed to provide
a long term reliable service, and 95% of warranty failures are rejected for one of the
above reasons. So please make sure that you:-
1) Avoid driving and ignoring the Low Fuel Warning Light.
2) If you are aware of fuel contamination, get the system cleaned, starting with the fuel tank!
3) Follow the maintenance program of your vehicle, which includes the fuel system.
If you have just removed a fuel pump, ask yourself why it failed. If you do not take a minute
to consider this question, the New Pump may suffer the same fate!