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  #25  
Old 05-14-2015, 10:31 AM
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Re: Fuel Tank Level & Fuel Pump Life ?

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Originally Posted by billt View Post
Thanks much Network! The pictures of the screen are REALLY HELPFUL. Thanks again for posting them. I'll do this today.
Glad you got the helpful pics. That's what I was trying to explain but I'm not talented enough with the Internet to post the pics.

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  #26  
Old 05-14-2015, 10:38 AM
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Re: Fuel Tank Level & Fuel Pump Life ?

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Originally Posted by Hemispin View Post
For those paranoid about fuel pumps burning up, let's try some simple math. I usually fill up between 1/8th and 1/4 of a tank. I've never replaced a fuel pump or had one fail.
No one is being "paranoid". All we're saying, (as well as several reputable sources), is it's best to avoid driving around on a regular basis with a near empty tank. That's all. If you've gotten away with doing it, congratulations. Consider yourself lucky. Buy a lottery ticket.

I've known several people who have done it over time, and most all of them have had to replace fuel pumps at one time or another. Several of them were told when they did, that driving on near empty tanks will increase the chance for fuel pump failure..... Just as the posted article stated.
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  #27  
Old 05-14-2015, 12:14 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

Looks like I have to buy a lottery ticket.
I constantly run the fuel tanks on all my cars to near empty before doing a full fill, and have never had a pump fail on me.
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  #28  
Old 05-14-2015, 12:38 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

Not this again.............
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  #29  
Old 05-14-2015, 12:41 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

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Originally Posted by 2014wk2 View Post
Not this again.............
But, but but shadetree mechanic folklore is IMPORTANT!!!
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  #30  
Old 05-14-2015, 01:32 PM
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Originally Posted by Turbozcs2003 View Post
Yes

You do not want to run the tank low or run it dry on the new returnless systems.

And the fuel does cool the pump, one of the reasons they put the pumps in the tanks and if you have ever replaced a pump in a 90's vintage tank, many still had external regulators and return lines, they have shielding in the tank with the return line to dump fuel back around the pump.

Good link
AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - What Causes Fuel Pumps to Fail

"To cool and lubricate the internal components, fuel must flow continuously through the fuel pump. Insufficient flow limits cooling and lubrication of the pump. A leading cause of fuel pump failure is running the fuel tank low. This is particularly critical on late model vehicles without a fuel pressure return system. Running such a vehicle out of fuel once can permanently damage the fuel pump."
I think you're misinterpreting that quote.

The heat issue isn't that the pump is being cooled by the fuel. It's that it would overheat if run dry. The same goes for any pump. There's nothing special about the fuel pump compared with any other pump on your vehicle that doesn't sit in liquid. That includes pumps in the hot confines of the engine compartment.

"Running low" is a nebulous statement, too. Low could mean anything from the last 1/4 gallon to the last 5 gallons.

The fact is, if running with less than 1/4 tank were harmful, the fuel light would come on then, not with a couple gallons left. For that reason, it's safe to assume you're just as safe in fueling up at that point as any other. As long as fuel is running through the pump, it should be working optimally. Any liquid moving pump will overheat when run dry because the pump mechanism is meant to run with liquid in it. Aside from noise and power usage, that's why sump pumps shut off when there's no water to pump.

Running out is very bad, though, which would be the main reason to fuel up sooner. You never know when you might get stuck in a long traffic jam that uses up more fuel than you planned. That would be the real reason for not having less than a quarter tank of gas in your vehicle - to avoid running out when you can't get to a gas station right away.

That goes double for winter, where a winter storm could trap you on the road overnight or longer and you need to run the engine for heat. In the winter, you should really keep at least a half a tank full not just for emergencies, but for extra traction from the weight.
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  #31  
Old 05-14-2015, 02:03 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

From the same link, draw your own conclusion.

I always try to keep a 1/4 of a tank or more, especially in winter. To me it costs nothing to fuel up and not run on vapors like some people do.


"When the fuel level is low, the pump has to work much harder to produce the same pressure. This is because the reduced fuel weight no longer pushes fuel into the pump. Instead the pump must draw the fuel in. A low fuel level also means less fuel to dissipate heat and lubricate the pump. The combination of an overworked pump, reduced cooling and lubrication will likely damage the fuel pump."
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  #32  
Old 05-14-2015, 02:22 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

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Originally Posted by Turbozcs2003 View Post
From the same link, draw your own conclusion.

I always try to keep a 1/4 of a tank or more, especially in winter. To me it costs nothing to fuel up and not run on vapors like some people do.

To me it costs nothing to pull into the station when the light comes on.

We are all different.

Everybody hug now
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  #33  
Old 05-14-2015, 02:23 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

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Originally Posted by NetworkTV View Post
Complete hogwash.

The fuel pump:

What can kill a fuel pump is letting the tank run dry and it's pumping air. If the pump actually got hot enough to need the fuel to cool it, it would be at risk of igniting the fuel vapor. It's in the tank because that's the best place to protect it and keep it close to the tank.

The alternator:

1) Every vehicle has an interlock to momentarily shut off unnecessary electronics during the cranking process. It all shuts off until the ignition switch goes back to "run".

2) The alternator doesn't even come into play until the engine actually turns over. It needs the engine to operate. Until then, your battery is carrying the weight.

3) When you're on the highway, the alternator is burning off far more power than the vehicle is using. At idle, the alternator is barely doing more than keeping up. If anything is being hurt by leaving stuff on at shutdown, it's your battery, not your alternator. Even that will charge back up when your RPMs get high enough for a long enough time to use the excess to charge.

4) If running all those accessories at shutdown were doing anything the alternator couldn't handle, they would have already tripped a fuse or breaker.

I've never replaced a fuel pump and I had plenty of times in the past where I was running on empty. My last truck lasted for over 16 years with no fuel issues. I kept my previous car for over 5.

Now, each one had an alternator replaced, but only because the brushes eventually turned to dust on them. The car was at 5.5 years, a couple months before I traded it in. The truck alternator lasted for 15 years and I ran with the headlights on day and night both.

What kills alternators? Spinning parts going thousands of RPMS. Drawing power from them doesn't. Unlike the battery, they won't ever give more than they can give. That's why they have the regulators on them: so they don't fry your batter when you're running a capuchino maker while towing a 30 foot boat.

As noted, if it bothers you, you can run all the lights on manual and turn off the settings for them to come on or stay on when getting in and out.
Well said...............

mechanics opinions are like a**holes everybody has got one
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  #34  
Old 05-14-2015, 05:05 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

What a load of absolute trash. what about the professional opinion of guys that have been in the trade for years. Most of the people offering there expert advise here wouldnt even understand the internal workings of there fuel tank and pumps. Its not as simple as one may think. Funny how we are meant to beleive everything when we google it.
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  #35  
Old 05-14-2015, 05:26 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

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Originally Posted by nicjak View Post
What a load of absolute trash. what about the professional opinion of guys that have been in the trade for years. Most of the people offering there expert advise here wouldnt even understand the internal workings of there fuel tank and pumps. Its not as simple as one may think. Funny how we are meant to beleive everything when we google it.
Google does do pretty good spell checking...
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  #36  
Old 05-14-2015, 05:57 PM
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Re: Fuel Tank Level & Fuel Pump Life ?

Forgive me oh heavenly google for i have just sinneduploadfromtaptalk1431640610222.jpg
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