99 7.3L bad fuel mileage question - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 03-26-2012, 08:21 PM   #1 (permalink)
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99 7.3L bad fuel mileage question

99 7.3 auto ext cab long box cold air straight pipe getting bad milege i have been driving it easy i get about 350 - 400 k per tank while some people i know are gettinh 700-800 k apperantly there are these rubber lines going from the turbo that go to the rear of the intake manifold somewhere i cant find them but i have been told they either crack or come loose often and cause very poor milege anyone heard the same or anything like ? or expirenced it ?
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Old 03-27-2012, 10:48 AM   #2 (permalink)
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Leaking turbo/intercooler boots is typically evidenced by black smoky exhaust and odd underhood sounds (whooshing/whistling), especially when under load. It may also cause the MIL (check engine) light to come on.

You certain the transmission is going into O/D and locking up as it should? (Under light acceleration it should shift/and lock at about 38-40 mph, causing the tach to drop to 1,200 RPM or so). Also you certain you have no dragging brakes, including the parking brake?

My '99 F250 suffered sudden significant mileage loss from frozen slider pins on both front and rear calipers. Replacing the calipers returned fuel mileage back to when the truck was new.

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Old 03-27-2012, 03:02 PM   #3 (permalink)
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Yea tranny is fine and I tightened up all intercooler boots and there isn't much drag how many k are you getting of a tank
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Old 03-27-2012, 05:09 PM   #4 (permalink)
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I never my F250 drop below about 5/8 on the gage. (It pains me to drop over $100 each time I fill up!)

However it routinely delivers 20 - 21 mpg highway @ 60 - 65 mph. The truck is a longbed (38 gallon tank). So 38 gal x 20 mpg = 760 miles, or about 1,225k per tank.

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'99 F250 PSD - bone stock.

My other diesel ride: The "Collosus of Roads": '79 Kenworth K100, tandem axle, 27' dovetail flatbed, NTC290 Cummins, 15 speed Roadranger.

Old tractors: '53 Farmall Super M, '53 Farmall Super H, '47 Minneapolis-Moline UTU.


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Old 03-27-2012, 07:27 PM   #5 (permalink)
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Im getting between 600-800 per tank, have you tried cleaning your ebpv tube and sensor?
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99 f-250 with a 03 7.3 ts performance, straight pipe, guages, intake, 417,000 miles....
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