poor fuel millage.

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Dec 4, 2008 | 02:16 PM

#16

brian42

Lead Driver

Joined: Dec 2006

Posts: 7,092

Likes: 145

From: San Diego, CA

Quote:

Originally Posted by caleb90

I have 01 f350 and i get around 300-370- miles out of a full tank.Im not shure what size my tank is but i think its 38 gal if thats the case im only getting 10 or so mpg.Is this right or is there some thing wrong?my truck is a 4door extended cab with a short box,so im not shure on tank size.Also how serious is the "valley pan oil leak" i think thats what its called.I was looking under my hood the other day and i noticed alot of residue on the rubber booots that come off the turbo to the intake on the motor.So i started to look around and the one sied rite below the valve cover u can see were its wet with oil.Its not leaking bad ithe dipstick says i havent lost any oil and its not leakyng down on the bell housing like i have heard it can. any info would be great.Im new to the diesel world so i dont now much about them.Also my truck has 90k on it.

Some things to check: tire pressure, intercooler piping boots (at the intercooler AND at the intake spider on top of the engine AND at the intake manifold under the spider), when was the last time the fuel filter was changed, are there any damp spots on the ground under the truck or on the underside of the truck on the driver's side (where the fuel lines run from the tank to the pump and engine).

Dec 4, 2008 | 02:19 PM

#17

KLWdesigns

Junior User

Joined: Aug 2008

Posts: 54

Likes: 0

From: east Mesa

Jacker

i get 12.5 mpg on the highway. I have 35" tires though and I know my speedo is off, so I assume my odometer is off. It's weird though, when i had 37"s i got 1mpg better. However I am concerned about my fuel mileage so i'l keep an eye on this thread.

Dec 4, 2008 | 02:43 PM

#18

husker

Hotshot

Joined: Mar 2001

Posts: 13,548

Likes: 77

From: Manhattan, KS

At only 8 mpg, I'd also look at the EGR tube to see if it is plugged. I've not done it, but they can be cleaned and unplugged. use the search tool for this forum.

Dec 4, 2008 | 03:08 PM

#19

brian42

Lead Driver

Joined: Dec 2006

Posts: 7,092

Likes: 145

From: San Diego, CA

Quote:

Originally Posted by caleb90

I was looking under my hood the other day and i noticed alot of residue on the rubber booots that come off the turbo to the intake on the motor.So i started to look around and the one sied rite below the valve cover u can see were its wet with oil.Its not leaking bad ithe dipstick says i havent lost any oil and its not leakyng down on the bell housing like i have heard it can. any info would be great.Im new to the diesel world so i dont now much about them.Also my truck has 90k on it.

90K, that's great! It's almost broken in...
As for the leaking boots: it will cause a little loss of power (I guess around 4# lost) but I don't think that will drop your mileage below 10. You can add these to your wish list:

http://www.dieselsite.com/index.asp?...ROD&ProdID=133
http://www.dieselsite.com/index.asp?...ROD&ProdID=228

Since you have a 7.3 and not a 6.0 I would check/clean your exhaust backpressure valve (EBV). Here's how to do it:

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