Re: OT, diesel moter HELP!

Posted by jdemaris on October 10, 2006 at 20:01:02 from (66.218.13.151):

In Reply to: OT, diesel moter HELP! posted by Tim Shultz on October 10, 2006 at 18:06:10:

The fuel filter isn't going to affect your fuel-mileage - unless it plugged and then you'd have less power. And - if your air filter was causing it - the drop should be fairly consistent.
From what you posted, you've done better than anyone I've met with a diesel Excursion. Most get around 18-19 MPG at best. My F250 with the 7.3 gets about 16 MPG at its best.
I'm not sure I understand all you said - since you say mileage dropped - yet while pulling a trailer mileage went up from 8 MPG to 13 MPG?
A few questions. First - is your highway-speed RPM that same as always? And, how are you calculating fuel mileage? Hopefully by filling your tank and dividing miles driven by actual gallons used. Also, diesels are more difficult to check than gas engines since diesel foams and often shuts off before the tank is full - and many stations only have high-flow truck pumps - which makes filling a vehicle likes your's difficult.
If you are sure your figures are accurate, and RPMs are same as usual - then there is probably something amiss in the fuel delivery itself - which is electronically controlled common-rail.
Also, to a smaller degree - winter fuel with high kerosene content will get worse mileage since it has less BTUs - but not enough to vary as you mention unless you've been driving around the artic.
Also - I assume power hasn't changed and you're not seeing any black smoke from the exhaust?

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