got a brain teaser - Ford Powerstroke Diesel Forum

 
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post #1 of 10 Old 11-29-2012, 05:46 AM Thread Starter
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got a brain teaser

ok guys, need some help here. got a 99 ps 7.3 that runs and drives great, no leaks, no smoke, no abnormal anything. the truck does great on fuel mileage almost all of the time. but out of nowhere it will suddenly burn through fuel like theres no tomorrow, then, it clears up and gets better again. I get fuel from the same place an evyone i know gets it there with no problems. any ideas
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post #2 of 10 Old 11-29-2012, 06:56 AM
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first question i would have is did u check the codes in computer...the computer stores codes without setting off dash warning lights

DONE:
EGR delete--4" turbo back exhaust
75HP tune
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post #3 of 10 Old 11-29-2012, 07:03 AM
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Someone is stealing your diesel!


______________________________________________
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Mods: BD-X monitor, 6637, BTS, GT38R, Snow MPGMax, International up-pipes, Hi-Flow Outlet, 5" Diamondeye, HPx, FRx, Gearhead tunes, Tru-Cool tranny cooler, Remote Start

376HP 791ft-lbs on 10.15.11
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post #4 of 10 Old 11-29-2012, 07:42 AM Thread Starter
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i have checked codes, did koer and koeo self test, watched all sensors and regulators, all is normal. I filled it up this morning and drove 55 miles exactly, and it is now below 3/4 of a tank, normally upon fill up it get about 90 miles til i hit 3/4 of a tank. all fill ups are the same as far as how much i top it off. always til i can see fuel in the neck
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post #5 of 10 Old 11-29-2012, 07:43 AM Thread Starter
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i know thats not an exact science but its definately not 40 miles difference in fuel
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post #6 of 10 Old 11-29-2012, 08:41 AM
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Are you running a winter blend or straight no.1 by chance?

Quote:
Originally Posted by bjs505 View Post
Of course I'm handy under the hood, I currently own a cummins.

2010 F350 CCLB Cabelas Edition
No Limit cai, Mini Maxx, 5" turbo back Flo Pro, Sinister egr delete, Sinister coolant filter, Cat EC-1, PTP shift solenoid. 20x9 +18 XD Monsters
01' 7.3 CCLB, 6637,wicked wheel G2, HPX, PHP Hydra, MBRP 4" Turbo back, Bellowed uppipes, Stancor gpr, 6.0 cooler, Fpr, Glow shift exhaust, pyro, trans, 203*/billet housing/ Cat EC-1, '07headlights/05' grill, Oh8' gate.
78' F350 "dumpy" old school
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post #7 of 10 Old 11-29-2012, 09:11 AM
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Ebpv sticking possibly.
maybe even brake caliper sticking

I made my Samsung SGH-I997 send this.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #8 of 10 Old 11-29-2012, 12:23 PM Thread Starter
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just regular no 1
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post #9 of 10 Old 12-01-2012, 03:01 PM
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Are you calculating this by hand or just going by what the gauge says?

If you are just going by what the gauge says then that may be your issue. That thing is never accurate.


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post #10 of 10 Old 12-02-2012, 12:04 AM
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If all else is the same runig wise, power, smoothness ETC I agree with 7.3 Lariet. Get a locking fuel cap
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