Letting your Car's fuel tank run empty? Drop the habit! I am a very conservative kind of person & i usually let my fuel tank run empty before filling up. I keep a 2 litre gasoline jar filled with me for emergencies. Yesterday, i was asked by my mechanic not to do so. He said that doing so can harm the engine. He did not elaborate so i searched on the internet for this. I came up with the following. Why you shouldn't let the car tank run empty?
1. Sediment from gasoline settles at the bottom of every gas tank. When you let your gas level run low, you force your car to use the dirtiest gas in its tank for fuel. The lower your car's gas level sinks, the more the dirt gets stirred up from the bottom of the tank. Drive on a near-empty tank and you risk this dirt getting into your car's fuel line and even into the engine. There's a good chance your car's fuel filter won't be able to catch all of it, especially if you drive with a barely filled gas tank on a regular basis. "You're going to pull the heaviest sediment into the fuel line," says Karl Brauer, editor-in-chief at Edmunds.com. "If it gets all the way to the engine, it could scar or damage internal parts of the engine." If this happens, you're putting extra strain on the engine. And you'll need to flush the entire fuel system if it clogs up with dirt. "You're talking a minimum of a couple of hundred dollars if it really jams up the system," Brauer says. At the very least, you'll need to replace your car's fuel filter more often. That will run you about $100. And if sediment deposits or sludge form on your fuel injectors, you won't like the way your car drives. "The car will run funny," says Tony Molla, a spokesman for the National Institute of Automotive Service Excellence. "It will feel like the car needs a tune-up." Link to Source
2. The fuel lines, if starved of fuel, might allow air to enter which is not correct. Its like running engine without engine oil. Fuel Lines are lubricated by fuel. If not done they are going to harm it. On the other hand, i came across this too. Dear Terry,
With gas as expensive as it is, I've been driving my car until the gas light comes on. But this goes against everything my dad taught me.
He said to never let your gas go below a quarter of a tank, otherwise you could get dirt in your engine and ruin your car. Is he right, or does he just not want me to run out of gas?
-- Riding Dirty Dear Riding,
Dear old Dad may have been right about many things, but when it comes to modern vehicles, he has this one mostly wrong.
Almost all cars have their fuel pumps installed inside the gas tank and the pump picks up the fuel from the lowest part of the tank, so you can get almost every last drop from the tank. If there is a lot of dirt and debris -- say, from a corroding fuel tank -- that gunk would normally settle to the bottom and be picked up by the fuel pump regardless of how much fuel was in the tank. But modern fuel pumps have a protective screen or porous sock-like cover that catches any contaminants before they enter the fuel system. And those small bits that might get through would normally be caught by a second filter closer to the engine. Back in the day, when manufacturers were churning out cars with very little rust protection, it was possible that after four or five years there could be some corrosion on the inside of the gas tank that could result in sediment. But most gas tanks these days are not prone to such issues. Where your dad may have been right is that you should always try to never run out of gas. That fuel pump inside the gas tank relies of the gasoline to keep it lubricated and cool, and if you frequently run out of gas you could cause the pump to fail. The good news is that the "low fuel" light comes on when there's anywhere from 1 to 2 gallons left, which is plenty to keep the pump safe. So it's OK to run the tank down to where the warning light comes on, but you should then get gas as soon as possible. Link to source. All this has left me more confused than enlightened. My questions are:
1. What according to you is correct?
2. Have any of the team-bhpians run into fuel-filter/fuel-pump/air-bleed problems due to empty tank?
Last edited by searchingheaven : 25th January 2013 at 10:43.
Reason: Spelling mistake.
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