MPG took a major drop, NEED HELP - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 02-16-2013, 07:33 AM Thread Starter
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MPG took a major drop, NEED HELP

ive got a 99 7.3 crew cab dualley 2wheel drive with 100k miles. about 2 months ago i noticed a fuel smell and started seeing pudles. found out it was the o-rings in the fuel bowl, so i searched on here and bought the o-ring replacement kit. replaced ALL the o-rings, fuel smell is gone and no more pudles. but now my mpg is horrible!!!

truck is 90% stock, MBRP SS exhaust,NAPA filter mod, CCV mod, nothing major.

any advise or reccomendations as to whats going on?
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post #2 of 12 Old 02-16-2013, 12:53 PM
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clean the EBP tube.

Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #3 of 12 Old 02-16-2013, 04:14 PM
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My mileage has significantly declined over the last little while. I cleaned the EBP tube to no avail.
I've determined that its time for injectors for me

PIS 230/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Dual SD fuel pumps, in tank mods, CNC Fab bowl retain kit. SDK Tunes. Isspro.
Still pretty slow, just less slow now.
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Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #4 of 12 Old 02-17-2013, 06:09 AM Thread Starter
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ok thanks. ill try the EBP cleanout.

how do you know you need new injectors??
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post #5 of 12 Old 02-17-2013, 08:10 AM
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Injectors wear out eventually. I'm getting to the point in mileage where they are due.

Worn injectors cause slower starting, rougher running, and poor mileage - all symptoms my truck has developed.

PIS 230/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Dual SD fuel pumps, in tank mods, CNC Fab bowl retain kit. SDK Tunes. Isspro.
Still pretty slow, just less slow now.
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Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #6 of 12 Old 02-17-2013, 08:16 AM Thread Starter
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i found a problem, the copper tube has a hole worn in it. but it looks like its been there. hopefully it fixes my problem.

now i have to find a new tube
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post #7 of 12 Old 02-17-2013, 09:04 AM
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DieselOrings: Exhaust Back Pressure Replacement Tube 99.5 - 03 7.3L Diesel

2000 F250 XcabSB, 4x4, 4" strait pipe, DIY intake, FRx, BDP tunes, WW2, 6.0 cooler, BTS VB, gauges, 55w digital projector HIDs
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post #8 of 12 Old 02-17-2013, 10:20 AM Thread Starter
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^^ got it thanks
i ordered a new tube and the senser just to be sure
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post #9 of 12 Old 02-17-2013, 11:21 AM
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Just another configuration for you guys is that you're all non winter diesel, it makes my miles per gallon go for about 10 to 12 down to 9 to 10... Just an idea there might not be anything wrong other than it is winter blend

What this nation needs is cleaner thoughts and dirtier fingernails...
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post #10 of 12 Old 02-17-2013, 03:05 PM
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Quote:
Originally Posted by dannanw View Post
Just another configuration for you guys is that you're all non winter diesel, it makes my miles per gallon go for about 10 to 12 down to 9 to 10... Just an idea there might not be anything wrong other than it is winter blend
thats what i was thinking. when i bought my truck i was getting around 15-17 now its down to 12-14


6637 mod.
zoodad mod.
4in turbo back split to duels
edge cts with juice

soon to have
ccv mod
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