Poor fuel economy - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 02-07-2010, 06:50 AM Thread Starter
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Poor fuel economy

I have a guy bringing a truck in to me today that is getting only about 12 to 13 MPG. It has 33' tires and no tunes. My truck has 37's and tunes and gets better then this. What would be some reasons other then a heavy right foot why his mileage sucks.

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Thanks. I'll give er a good wackin in the morning.
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post #2 of 25 Old 02-07-2010, 07:06 AM
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Could have a fuel leak... may have some useful info in these threads.

poor fuel mileage

Filter drain o-ring leak or something else?

I'm having the same problem with my truck,11-13mpg on a basically stock truck even has stock tire size. I've been busy at work and its been too cold out to look into the problem. (Wish I had a garage)

Anyways, Good Luck finding his though...

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post #3 of 25 Old 02-07-2010, 07:14 AM
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Boost leak? (I'm assuming it's a diesel and turboed?)
Exhaust leak?
Weak fuel pump might do it? I can't remember what you're problem was but wasn't it a bad pump?
Fuel filter? Air filter? Oil filter and change? When were they done last?
Maybe some clogged fuel lines, injectors?
Heavy truck?
Bad gearing in the rear diff?
Low tire pressures?/Not correct pressures?
Wind resistance?
Thermostat won't open and running too cold?
Ok I'm tired of throwing stuff out there
That's all I could think of anyway.



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post #4 of 25 Old 02-07-2010, 10:19 AM
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Quote:
Originally Posted by jesilvas View Post
Boost leak? (I'm assuming it's a diesel and turboed?)
Exhaust leak?
Weak fuel pump might do it? I can't remember what you're problem was but wasn't it a bad pump?
Fuel filter? Air filter? Oil filter and change? When were they done last?
Maybe some clogged fuel lines, injectors?
Heavy truck?
Bad gearing in the rear diff?
Low tire pressures?/Not correct pressures?
Wind resistance?
Thermostat won't open and running too cold?
Ok I'm tired of throwing stuff out there
That's all I could think of anyway.
ah come on theres got to be one more in there somewhere

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post #5 of 25 Old 02-07-2010, 11:38 AM
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Oh yea. Dragging brake pads?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #6 of 25 Old 02-07-2010, 12:11 PM
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Quote:
Originally Posted by jesilvas View Post
Boost leak? (I'm assuming it's a diesel and turboed?)
Exhaust leak?
Weak fuel pump might do it? I can't remember what you're problem was but wasn't it a bad pump?
Fuel filter? Air filter? Oil filter and change? When were they done last?
Maybe some clogged fuel lines, injectors?
Heavy truck?
Bad gearing in the rear diff?
Low tire pressures?/Not correct pressures?
Wind resistance?
Thermostat won't open and running too cold?
Ok I'm tired of throwing stuff out there
That's all I could think of anyway.
passenger seatbelt not engaged?
rear vent windows open?
didnt clean thr prius off the grill?
dragging part of a mail box you didnt see when backing up?
parashoot break engaged?? (could have a hemi)
DUNNO

Now this was a superior machine. Ten grand worth of gimmicks and high-priced special effects. The rear windows lit up with a touch like frogs in a dynamite pond. The dashboard was full of esoteric lights and dials and meters that I would never understand.
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post #7 of 25 Old 02-07-2010, 12:48 PM
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Originally Posted by Ozone-etr1 View Post
didnt clean thr prius off the grill?
DUNNO

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post #8 of 25 Old 02-07-2010, 02:35 PM Thread Starter
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Thats some good stuff. His OBD pord was busted so no code pulling. Having to do this old school

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

Quote:
Originally Posted by XPLOSIV View Post
Thanks. I'll give er a good wackin in the morning.
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post #9 of 25 Old 02-07-2010, 02:54 PM
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Quote:
Originally Posted by RRonning1984 View Post
Thats some good stuff. His OBD pord was busted so no code pulling. Having to do this old school
why dont you fix it :
computers are your friend

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post #10 of 25 Old 02-08-2010, 08:14 AM
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Might have a heavy right foot
might be letting it idle a lot to warm up
EBPV kills mileage/power
brake dragging

Please put a light
on the flag you fly at night.


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