My 16 year old truck has 235K kms/ 147K mi and is on its original fuel pump. I just scoped the current waveform and it looks fine with no hint of brushes reaching the end of their life. Current draw and fuel pressure is normal and the pump sounds normal. Of note is that this truck is driven in a big congested city and the lifetime average speed of the truck is 30 km/hr / 19 mi/hr. So the 147K mi would be more like 200K mi if the truck had been driven in a less congested area, as far as fuel pump wear is concerned.
I do not let the fuel tank go below 1/8 tank, which still leaves 15l / 4gal of fuel in the tank. I buy fuel exclusively from Costco which ensures fuel quality. I am tempted to leave it be and not prophylactically change the pump. I was wondering how much warning signs would I get of an impending pump failure - erratic current waveform, abnormal noise, low fuel pressure leading to a code for some engine performance related parameter like STFT, LTFT or O2 sensors. Or is the pump going to lockup on me without any warning? If the latter I will lift the bed up and replace the pump with a Delphi from RockAuto.
I do not let the fuel tank go below 1/8 tank, which still leaves 15l / 4gal of fuel in the tank. I buy fuel exclusively from Costco which ensures fuel quality. I am tempted to leave it be and not prophylactically change the pump. I was wondering how much warning signs would I get of an impending pump failure - erratic current waveform, abnormal noise, low fuel pressure leading to a code for some engine performance related parameter like STFT, LTFT or O2 sensors. Or is the pump going to lockup on me without any warning? If the latter I will lift the bed up and replace the pump with a Delphi from RockAuto.