MPG took a major drop, NEED HELP - Ford Powerstroke Diesel Forum
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Old 02-16-2013, 07:33 AM
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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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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
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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
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Old 02-17-2013, 06:09 AM
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ok thanks. ill try the EBP cleanout.

how do you know you need new injectors??
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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.
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Old 02-17-2013, 08:16 AM
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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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Old 02-17-2013, 09:04 AM
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DieselOrings: Exhaust Back Pressure Replacement Tube 99.5 - 03 7.3L Diesel
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Old 02-17-2013, 10:20 AM
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^^ got it thanks
i ordered a new tube and the senser just to be sure
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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
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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
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