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Old 08-28-2011, 07:44 AM   #21
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Re: How Low Can You Go?

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Originally Posted by Stumpalump
Gas engines should not be run low either. The fuel return line returns hot fuel and the pump needs cool fuel to keep it cool. Running it almost out all the time shortens the intank fuel pump life.
Agree. If there's any crud in a fuel tank, be it gas or diesel, running it very low is a good way to pull the crud into the fuel system, which at best-case, will get trapped by the fuel filter.


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Old 08-28-2011, 05:32 PM   #22
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How Low Can You Go?

I can comment on the computer cut-out. I had the opportunity to test it last summer. If memory serves, about 50 miles past low fuel light the computer started cutting the engine at regular intervals. It reminded me of a Z28 I had with a limiter at 110 mph (only tested under very safe track conditions of course). When I stopped to fill it took about 45 gallons. Point being that the computer DEFINITELY stepped in with a physical warning prior to running out of fuel.

Mine is an '09 6.0 with the Transferflow tank. Hope that helps.
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Old 08-29-2011, 02:21 PM   #23
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Re: How Low Can You Go?

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Originally Posted by jessenej
I can comment on the computer cut-out. I had the opportunity to test it last summer. If memory serves, about 50 miles past low fuel light the computer started cutting the engine at regular intervals. It reminded me of a Z28 I had with a limiter at 110 mph (only tested under very safe track conditions of course). When I stopped to fill it took about 45 gallons. Point being that the computer DEFINITELY stepped in with a physical warning prior to running out of fuel.

Mine is an '09 6.0 with the Transferflow tank. Hope that helps.
Thanks for the answer. Hopefully that's what Tom experianced and no harm was done to his engine.
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Old 12-03-2012, 03:47 PM   #24
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Re: How Low Can You Go?

Tank does have a label confirming that it is 46 gallons. The stock guage is now not linear in its display.. Ex. 1/2 tank = about 25 gallons. 1/4 tank= 12-14 in my experience. Ditto on bad idea suggestions on running then down to low.. just good to know..
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Old 12-03-2012, 09:27 PM   #25
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Re: How Low Can You Go?

There is a low fuel light???

The airtronics diesel heater won't work below 1/4 so I have never come close to empty.
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Old 12-04-2012, 12:19 PM   #26
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Re: How Low Can You Go?

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Originally Posted by Zeta
I wanted to find out far I could drive after the low fuel light came on. Including two or three cold starts, I was only able to go 50 miles until it started missing--I had five gallons with me so I wouldn't be stranded. Sportsmobile told me my rig has a 47 gallon tank, not true. Forty is what it took.

Fun driving for 20+ miles with the gauge below E.


Z
I know I've mentioned this elsewhere, but perhaps not on this thread: When I fill my 47-gallon tank, I find that the extra fuel goes "above" the Full line, not "below" the Empty, despite what Sportsmobile told me. But, filling that extra 10 gallons above Full can be difficult -- tediously slow unless you modify your tank's breather hose.

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Old 12-04-2012, 07:59 PM   #27
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Re: How Low Can You Go?

Yeah, and if you fill really slow and don't watch it, it spills ot the breather tube
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Old 12-04-2012, 08:29 PM   #28
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Re: How Low Can You Go?

I see the low fuel light come now and then when it hits about E on the gauge. I know it's iffy because I never put in more than 2 gallons after it clicks off so I don't know how may miles I have left at E. I don't think I've ever put in more than 40 gallons. I've never had it cut out though so I wonder what the logic the computer is using as input? Low fuel light + some amount of miles? I think I've done 20 or 30 miles on the light thinking I probably had 100 miles left. No Espar so no 1/4 tank worry's.
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Old 12-04-2012, 08:47 PM   #29
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Re: How Low Can You Go?

Screw that low fuel light. Hell I don't want to suck from the pit anyway. I'd like it to come on just above a 1/4 tank...That would mean something to me or my Espar stuff at least
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Old 12-05-2012, 08:17 AM   #30
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Re: How Low Can You Go?

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Originally Posted by daveb
Screw that low fuel light. Hell I don't want to suck from the pit anyway. I'd like it to come on just above a 1/4 tank...That would mean something to me or my Espar stuff at least
The checklist that SMB provided me says "D-5 System - Be sure fuel is above 1/8 tank". Maybe the criteria changed?
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