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#1
10-12-2009, 06:12 PM
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To What Extent Can Bad Fuel Affect Mileage?
I very consistently get 28-31 mpg on the 91 300D. Never seen lower, never seen higher. However, I just used up 4 gallons to go 80 miles....I had never seen the gauge so quickly get to the 3/4 mark.
Could a bad tank of fuel ALONE account for such a deterioration in mileage? There are no other symptoms. I know I need more data to form firm conclusions....at this point I'm simply wanting to know if bad fuel alone could cause a 30% drop in fuel economy. Thanks.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
10-12-2009, 06:21 PM
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yes bad fuel,water and low cetane.Add power service.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt
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#3
10-12-2009, 06:44 PM
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I've been driving MB diesels for six years now....maybe I've just never had a really bad tank of fuel before (until now).
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
10-12-2009, 07:10 PM
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Are you sure that it isn't leaking anywhere? It may be something stupid like a leaking primer pump or a loose banjo bolt... Park over a peice of cardboard and see if anything shows up tomorrow morning...
Hope you resolve this issue! No one likes throwing money away... Cheers!
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Regards, Ian White 1995 E300 Diesel w124 OM606 2014 E550 w212 M278 biturbo 2001 BMW 740i E38 M62 (past) 1981 300SD w126 OM617 (past)
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#5
10-12-2009, 10:20 PM
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If you're getting 30% less mileage, that would imply that there's 30% less energy in the fuel, and you should be getting 30% less power which you'd certainly notice when accelerating.
Is there smoke and/or nailing?
__________________
 Gone to the dark side - Jeff
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#6
10-12-2009, 10:26 PM
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Quote:
Like I say, I need more data. But I'm going to be putting a lot of miles on it over the next week or so, so I wanted to figure things out ASAP.
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#7
10-12-2009, 10:43 PM
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Any possibility it is the gauge or fuel level sender? Or did you add four gallons?
__________________
1985 300 D T - Rauchsilber (Smoke Sliver Metallic) with MB Tex Quartz 155 = Cream interior -  320K and counting!1999 E300 TD - Silver - Just got her 3-13-15 ! the 2nd '83 300SD - Brown Metallic - traded away 1985 Limo Diesel aka "Stretchy" - Sliver - Blue Int - Sold but still in Athens 1983 300SD - Brown Metallic - Sold April 2008  1982 300 D T - Royal Blue with Tan interior - Sold
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#8
10-12-2009, 10:52 PM
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Hmm...I know there is a pretty decent hit when the stations switch to winterized diesel, but, I'm not sure how much (or if it's too early for that).
I don't trust my gauge enough for any sort of accurate measurement - I've never had half or quarter of a tank be very close when filling up. I've been surprised a couple of times. No leaking return lines? (had to ask  )
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1982 240D, sold 9/17/2008 1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009 262,715 and counting 
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