800 mile in one tank

[Vekke]

Hi,

It time to post one milestone in my car. 816.5 miles in one tank. Fillup was 13.2 gallons so there were ca. one gallon left. So the next goal is 900 miles which should be guite easy if I drive like couple of tanks ago . More mods are coming so the tank mileage should go up.

One thousand is the next real goal

[Daox]

Congrats and good job!

[hummingbird]

Congrats, way to go! Got to get that 900 tank soon!

Just a word of caution, don't go scraping the bottom of your tank - bad for your fuel pump, and if it sucks in some dirt, bad for your injectors/engine as well.

[Vekke]

Yes, air is always bad in fuel system and also lots of dirt. However there are fuel filters to protect the system from dirt. The engine sucks its fuel aways from the bottom of the tank. So thats no excuse to dont drive the tank to "empty". Still the air i a problem so if you drive your tank to empty drive smoothly the last 40 miles etc...

I believe I wil hit 900 after three week when I go again to my homeplace. I have got always the best mileage on that trip, because the full tank is trip consumption and speed limits are lower than on my regular week route .

[NachtRitter]

Wow! Incredible! Great job!!

[hummingbird]

Vekke, it is not just the dirt... The fuel pump uses the fuel around it for heat dissipation, so going too low on fuel would lead to fuel pump failure/connection trouble due to overheating.

[Christ]

Vekke - if you don't think there's sediment building up in your tank, go ahead and drop it once, then drain the fuel from it. You'll think differently. The "sock" filter on the fuel pump isn't designed to remove ultra small particles... that's what the fuel filter under the hood is for... and even it doesn't remove anything truly fine. If the fuel pump didn't pick up dirt and sediment, you wouldn't need a fuel filter under the hood to protect the injectors.

[Vekke]

Yes I know there is dirt and scum in the bottom but how the fuelpump wont suck it in when there is still lots of fuel at the tank?

The dirt is heavier than diesel and the pump sucks the fuel from the bottom of the tank. So all that crap that is floating there at the bottom will be sucked by the pump the same way as with almost empty tank. Ok the scum is in little less fuel so the mixture will be little "thickier" but I think the pump will suck it anyway.

At the moment I have filled only two times so that the ligth has been on for ca.50 miles. So the tank hasnt never been fully even empty yet. I have still had range left ca 50. I think that normal driver drives his tank more empty often than I do! Reason is that I try to fillup always in the same station which happens to be usually the cheapest . So I will fill my tank always in that station when the meter is below half. That is the mark if it is above I can do my normal trip and fill then.

And by the way I have a mechanical fuelpump in the enginebay. The actual fuel filter is I think before the pump in the enginebay also... The sock which was mentioned above is for the big dirts and is located at the tank, that is true.

So those are only my opinions of the situation and are based some kind of technical experience of the current subject (automotive engineer)...