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Old 06-28-2009, 09:12 AM   #11
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Originally Posted by theholycow View Post
Erik's right. Most fuel pumps are cooled by the gasoline. Keeping it above 1/4 tank should ensure normal service life. Running it down to fumes all the time risks premature failure.

I had a fuel pump fail around 120,000 or 140,000 on my truck, blamed on my habit of running it down to fumes every tank.
I know what you're saying, and I'm aware of how common it is to believe this, HOWEVER, have you actually EVER opened up your gas tank? Go open up your gas tank/get to the area where your fuel pump is, get a good look with a flash light and then you'll understand better.
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Old 06-28-2009, 01:36 PM   #12
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Most fuel injection pumps are cooled by the gasoline they are pumping- so if they run out of gas, the pump will be spinning and heating up- possibly decreasing its lifespan.
imz- In my original post (attached), I wasn't saying that they are cooled externally by the fuel sloshing around outside of them (you are right about that)- I stated that "most fuel injection pumps are cooled by the gasoline they are pumping"

I could have clarified better by saying "As the relatively cool fuel moves up, through and out of the running electric fuel pump, heat is carried away from it".
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Old 06-28-2009, 05:00 PM   #13
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Originally Posted by Erik View Post
Most fuel injection pumps are cooled by the gasoline they are pumping- so if they run out of gas, the pump will be spinning and heating up- possibly decreasing its lifespan.
I wasn't saying that they are cooled externally by the fuel sloshing around outside of them (you are right about that)- I stated that "most fuel injection pumps are cooled by the gasoline they are pumping"

I could have clarified better by saying "As the relatively cool fuel moves up, through and out of the running electric fuel pump, heat is carried away from it".
Yeah you tell him BOYYYY!!!!! lolwut
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