Diesel RVs: Re: [diesel_mercedes] OMG Gas mileage SUCKED this tank!

Well, NOBODY gets 42 mpg out of these ironhead diesels. Best you can expect is 24-26 mpg for a normally aspirated 300D. That's pretty much normal.

The "valve thing" is actually your injector. What is leaking ('near as I can tell from the photo) is the fuel return line. These are the black hoses that run between each injector, and they are of a funky size and material, and difficult to find. A good source for this stuff is www.autohausaz.com:

http://www.autohausaz.com/search/product.aspx?sid=3pn1s04544xwmy45e5ukku55&makeid=800016@Mercedes&modelid=1193981@300SD&year=1979&cid=22@Fuel%20%26%20Air%20System&gid=6352@Fuel%20Hose/Line

They will also have your valve cover breather tube elbow:

http://www.autohausaz.com/search/product.aspx?sid=3pn1s04544xwmy45e5ukku55&makeid=800016@Mercedes&modelid=1193712@300D&year=1981&cid=22@Fuel%20%26%20Air%20System&gid=6344@Air%20Intake%20Boot/Hoses

I can't really explain why you achieved 37 mpg on one tank, then 18 on the next. That averages out to 27.5, which is pretty close to expected (and pretty good, too!). How did you measure? By filling the tank to the tippy-top of the filler neck each time? If you went by the fuel guage alone, you should know that the sending units often get crudded up, making them at least a little unreliable....

Mark in Lakewood, CO

From: "patricia_dougherty" <purrfectharmonyfarm@wifi45.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Tuesday, October 4, 2011 7:46:54 PM
Subject: [diesel_mercedes] OMG Gas mileage SUCKED this tank!

What on earth??? The kid I bought my car from said he got 42mpg. I got 37mpg the first time I put gas in it. This time around I got 18mpg!!!!! WHAT??? I've done the math several times, checked my reading a couple of times. I know that valve thing is leaking, but THAT MUCH? No way! I did notice that my transmission wasn't shifting properly yesterday, but would that make my gas mileage go down that much? Oh man this isn't good.

Any input is always appreciated.

Trish

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