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An in-tank pump is typically cooled by being immersed in the liquid gasoline. When the gas level drops too low the pump gets less cooling.

by chiph 5y ago

throwaway0a5e 5y ago
So you've knocked a couple operating hours off the life of something that tens of thousands of operating hours? Big deal. It'll be fine unless you run it dry for a long period but you won't be doing that because cars don't run the pump when the engine isn't running.
- wiseleo 5y ago
  I have replaced fuel pumps. This involves a lot of work and often a specialty wrench. You will usually need to drop the fuel tank, which requires at a minimum raising the vehicle over 18" into air. The standard 14" jack/stands solution most motorists own is insufficient. They need to be replaced mostly because their integrated fuel filter gets clogged by the sediment accumulated at bottom of the tank, which causes the motor to fail. When the tank has plenty of fuel, the gunk at the bottom of the tank is less likely to be ingested by the system.
- obmelvin 5y ago
  I mean, I get your point, but I need to refill my car at some point and there are plenty of gas stations - so why not fill it up early to take care of it?
- Spare_account 5y ago
  This is in the same territory as the advice I see sometimes to make sure you don't turn the steering wheel while the car is stationary ("dry steering") because "it will put stress on steering components and shorten their life, and it will damage the tyres". These pieces of advice are technically correct but catering for edge cases that won't affect 99% of drivers/vehicle owners. Modern cars are designed for the way people use them; people run their tanks to empty all the time.
- chiph 5y ago
  For my car, the pump assembly is $900. And then there's the labor charge to put it on a lift, drain out whatever fuel is in there (saving it for later), dropping the tank, and then to remove/replace the bad pump. I would guess an easy 3 hours labor. With the average used car on US roads now over 12 years old, having the pump go bad could mechanically total some vehicles (the repair cost would exceed the vehicle's worth), so you're going to want to prolong it's life however you can.

An in-tank pump is typically cooled by being immersed in the liquid gasoline. When the gas level drops too low the pump gets less cooling.

by chiph 5y ago

An in-tank pump is typically cooled by being immersed in the liquid gasoline. When the gas level drops too low the pump gets less cooling.

throwaway0a5e 5y ago

So you've knocked a couple operating hours off the life of something that tens of thousands of operating hours? Big deal. It'll be fine unless you run it dry for a long period but you won't be doing that because cars don't run the pump when the engine isn't running.

wiseleo 5y ago
I have replaced fuel pumps. This involves a lot of work and often a specialty wrench. You will usually need to drop the fuel tank, which requires at a minimum raising the vehicle over 18" into air. The standard 14" jack/stands solution most motorists own is insufficient. They need to be replaced mostly because their integrated fuel filter gets clogged by the sediment accumulated at bottom of the tank, which causes the motor to fail. When the tank has plenty of fuel, the gunk at the bottom of the tank is less likely to be ingested by the system.
obmelvin 5y ago
I mean, I get your point, but I need to refill my car at some point and there are plenty of gas stations - so why not fill it up early to take care of it?
Spare_account 5y ago
This is in the same territory as the advice I see sometimes to make sure you don't turn the steering wheel while the car is stationary ("dry steering") because "it will put stress on steering components and shorten their life, and it will damage the tyres". These pieces of advice are technically correct but catering for edge cases that won't affect 99% of drivers/vehicle owners. Modern cars are designed for the way people use them; people run their tanks to empty all the time.
chiph 5y ago
For my car, the pump assembly is $900. And then there's the labor charge to put it on a lift, drain out whatever fuel is in there (saving it for later), dropping the tank, and then to remove/replace the bad pump. I would guess an easy 3 hours labor. With the average used car on US roads now over 12 years old, having the pump go bad could mechanically total some vehicles (the repair cost would exceed the vehicle's worth), so you're going to want to prolong it's life however you can.