ml 270 cdi heavy on the fuel ????

[toby mc]

hi! guy,s got problem hope no one else has the same as me ? but hope you can all help! my ml 270 cdi diesel got it 2 months age done a few long round trip s pulling a caravan up and down every god damn hill in the u.k.and it was great i thought ,couple of week,s ago filled up right to the top brakes wre pulling on the trailer merc got thirsty 20 miles later over 1/4 tank gone sorted the brakes out then carried on better after about 120 miles coming home filled up again 60 miles later stopped for a break started again 1/2 hour later merc struggled to start got going drove home ,now the merc using 1/4 of tank for 60 miles that,s about 4 gallon s i reckon ,down to half a tank filled up with only 20 litres tank full got real head aches ,went to merc have a new seal put in leaking auto box £104.00 they said that all the sences are working no leaks pump o.k. idon,t know every body can any one shed light onit :?: .

all the best to you all .denton

 

[kebo57]

Cant help with the fuel problem but mine can do 160 miles off 18.2 litres 4 galls if I dont rev above 2500 rev's never had less than 100 miles off 18.2 lts
18.2 lts at 78 mph on cruse = 120 miles

 

[jberks]

You need to do a proper fuel check - fill up, note mileage run for a couple of hundred miles etc and do the maths. The guage isn't totally accurate and to be fair you can't judge to the nearest 2 gallons using the gauge.
Clearly, without a trailer, on proper running (not sitting in jams), less than 20mpg would be a problem, but there are so many things environmentally related that affect mpg, apart from the mechanical stuff, it could be anything.
Mechanically, assuming no leaks (they'd be pretty obvious) it could feasibly run rich under certain circumstances with dodgy MAS units etc, but you'd be watching big black clouds pouring out of the back. I assume the exhaust is clean (or as clean as a diesel gets).
I also assume it runs as it did and you're not suddenly finding it low on power.
The fuel has to go somewhere so it's either down the exhaust in the form of soot or out of a leak in the fuel system.
Start with a check so you have some proper numbers to work with based on known driving conditions. My E270 can return 48 but it can also return 23!

 

[blassberg]

i used to get 400 miles from a tank (6sp manual)

 

[Mark A]

My 2002 ML-270 seems to always give me about 26mpg, even if I drive it like a loon. I do a 60mile round trip every day, and that includes about 1hr of town driving each day. On a long motorway trip it is slightly better, but hardly noticable. It's a fair bit cheaper to run than my previous 4x4 (4.0L Discovery) which gave me 17mpg on a good day & 12 on a bad.

Mark

 

[IAN MAC]

Sprinter 310, loaded up, stockcar on trailer, foot to the boards..... never been less than 24 tae the gallon. Nae complaints...