High Fuel Consumption
 

Hi

My 1984 300SD is becomming a gas guzzler i calculated and i am getting about 11 to 17 miles to a gallon!!!! could it be that its running too rich or dose it need a valve adjustment or is it something else.

Thx

RE: High Fuel Consumption
 

I vd check and i have not found any leaks and there is no smell.

RE: High Fuel Consumption
 

Adjustment,or aircleaner,leaky injectors,dirty clogged bango bolt for ADLA.Binding brakes are common too.My SD gets 38 hwy,up to 50 mpg around town.

RE: High Fuel Consumption
 

It had been a while since the fuel filters were changed on my 90 300D. Went from 25 to 32mpg.

RE: High Fuel Consumption
 

Do you have a locking gas lid? Make sure it locks.

Put paper under the car, front and back. I suspect the fuel lines under the tank or the injector return lines are leaking badly.

RE: High Fuel Consumption
 

Assuming there is no theft and no leaks and the car is running normally, then watch the odometer. It's probably not tracking mileage correctly. I havehad them stop working for weeks and then come back to life but the recording was never correct.

RE: High Fuel Consumption
 

hi i already reslove my toubled gas milage, Valve adjustment, and serious amount to purging thx for the help

RE: High Fuel Consumption
 

Were the valves tight or loose? Was it intake or exhaust?

RE: High Fuel Consumption
 

not sure i send it to mech and he did not said anythingor describeabout thoses valves.....