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What year is you Polo? If you are in any doubt about the fuel filter change it anyway! They are usually cheap to buy.
When was the vehicle last given a full service? Oil, Air and fuel filters can cause bigger problems that you would expect. Old spark plug can do the same.
I'll need a bit more information to help. When you drive it what exactly does it do? Is it low on power? Does it struggle when you accelerate hard? Does it stall at junctions? Does it idle unevenly? Use the comment button below and I'll try to help you more.
Fuel pumps generally last a long time and only fail on very high mileage engines. The only times they fail sooner is if it have not been used properly. Running a vehicle constantly with a nearly empty fuel tank causes the pump to overheat and wear out faster.
Most 4 cylinder engines use the firing order 1,3,4,2. Number 1 cylinder is the one nearest the belts and pulleys on the end of the engine.
Check carefully for fuel leak. If it starts well and then gets worse as it warms up, check coolant temp sensor. May be it just smells like fuel because it misses so badly fuel is not being burnt and floods tailpipe. Check spark at plugs with timing light to avoid sparks where fuel may be present. Weak or irratic spark can be coil/module, crank/cam sensor. Remove plugs to see what they look like or which is not firing.
Has the car been serviced recently?
If not I would suggest getting it done.Not sure if you have diesel or petrol, but oil can thicken causing more load on the motor and airfilters get blocked and can cause a rich fuel mixture.
If petrol you can take out the plugs to check if they are a light brown colour, if very dark or black you need to check and adjust carb/injection settings/filter.Need to know what engine it is really.
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