How's everyone doing? I haven't been on much the last couple of weeks as we've been moving our shop to a new location. Anyways, the truck has gotten a lot of work hauling about 40 loads on my trailer.
I seem to be getting very poor mileage - about 250 miles to 22 gallons. I changed the lift pump a few weeks ago because it was leaking, but I can't seem to find anymore leaks and I am at the verge of wanting to sell this thing if it keeps drinking fuel the way it is. I love the power, but I don't seem to be getting the huge fuel mileage that I keep hearing these 1st gens in particular get. Any suggestions? I still haven't had the time to move the smoke screw flush with the AFC cap or move up the star wheel, but I don't think those changes will give me double the mileage. HELPPP!

 

Just a guess, but I would be willing to bet the torque converter or the bands on the transmission are getting weak.

 

Trans seems to be doing well - it was rebuilt about 2 years ago. I installed the shift kit and adjusted the bands a few weeks back as well. It doesn't take much to get the truck moving. In fact, without spooling up the turbo, I can lay 50+ feet of rubber from a dead stop. The truck is very responsive, but I appreciate the suggestion, Boatnik.

 

Maybe try some other things like filters and tire pressures.

 

How long has this been going on? You mention the tranny work that you had done, is there any possibility that work has effected your mileage?

-Steve

 

adj star wheel and smoke screw.......then see if the mileage is a factor.......did you mark you original setting before you started turning them?
if so put it back to were it was originally and so what happens.

 

Tires are 235/85R16 at 50psi. It really never has given me great mileage. After I did the lift pump I managed about 300 miles to a tank while towing my Jeep (about 7K with trailer). Maybe it's just the city driving, but I was sure hoping for a lot more than what I'm getting. I will try and adjust the smoke screw and star wheel this weekend, but the temp is hovering around 20*F and my garage isn't heated.
Would a bad fuel filter cause the mileage to be this bad? It looks fairly new to look at, but I guess looks could be deceiving.

 

I run empty all the time and I have my tires 65psi in the front and 50psi in the rear on 235-85-16 so that could make a difference. I can tell a difference in mileage when one of my tires gets low.

For the fuel filter I change mine every two years regardless of miles which works out to be around 12-14000 miles for what I drive now.

 

I run all my tires at max most of the time. I also can tell by the MPG when the tire pressures are off. My MPG has dropped a little with the cold weather it seems. I used to get 20 mpg plus easy not I can barley touch 20 Mpg. I'm going to try and few thing and see what happens.

 

Definitely a bit more pressure up front. I run 65-70psi, otherwise it seems to plow...and do back out that smoke screw and run a tank through.