My Milage has droped form 16 MPG to 11mpg any Idea's

[jaysoverall]

Hi, I am new to this site and a new diesel owner I bought the truck from my father plumbing business. So I know the truck history and its performance.

As a side note I can't get an open door alarm to clear I ended up just pulling the bulb.

The truck is a 99 f350 crew cab 127,000 miles 7.3, manual transmission

Bump

Thanks for any help

J

[orangesbc383]

i would change the fuel filters and take a look at the air filter those are good places to start

[jaysoverall]

I changed the air filter I thought that would make all the no luck. The fuel filters are they difficult to change or is that some thing I should have the shop do.

[Dave]

Fuel filter is an easy one. Its right behind the appearance cover on the top of the motor. Its the black round plastic cap. what i do is take a half inch drive ratchet and extension turn it loose drain the bowl with the yellow lever behind it, and put the new one in

[jaysoverall]

Thanks I will give it a shot tonight thanks for the info.

[sldghamr]

the gas station that you go to, have they switched to ULSD lately??

[jaysoverall]

Man!!! I need to slow down and spell correctly. I look like an idoit. Thanks everyone for your help.
J
bump

[jaysoverall]

I am not sure I use Chevron's fuel. In Idaho I don't know for a fact or not if the fuel is treated.

[jaysoverall]

Any other thoghts I heard that I might have leaky seals around my injectors BUT????????
BUMP

[Blue01F250]

I would definately start with the fuel filters -- let us know how that turns out and if it helps or not, then we can move on to whatever else it may be...