GLK-Class (X204) Produced 2008-2014

Bigger Fuel Tank?

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Old Nov 4, 2024 | 01:50 PM
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Bigger Fuel Tank?

I know it's dumb, but could a bigger tank be fitted onto these vehicles? Maybe one from a e350. It's crazy how a mini suv got a 15 gal tank while the e350 got a 21 gal tank. I wonder if there's room? 🤔
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Old Nov 4, 2024 | 02:20 PM
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Not likely, since the GLK is based on the w204 C-class platform.

And the GLK's gas tank is 17.4 gallons which is larger than other compact SUVs in the same class.

If longer range is what you're after, the diesel option can go up to 700 miles on a full tank. But then you're going to deal with all of the issues specific to diesels that most people (1) don't know about, or (2) are not able to afford maintaining.
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Old Nov 4, 2024 | 03:44 PM
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2006 Alfa Romeo Brera, 2010 GLK350, 2018 BMW 640i GT, 1997 Subaru SVX, 2012 Moto Guzzi Norge GT8V
Yes but 17.4 US Gals is 14.48 Imp Gals. Which measurement is used in his/her country?

Last edited by Silver Shadow; Nov 4, 2024 at 03:46 PM.
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Old Nov 4, 2024 | 03:54 PM
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GLK 250
Originally Posted by Silver Shadow
Yes but 17.4 US Gals is 14.48 Imp Gals. Which measurement is used in his/her country?
User profile shows U.S. is country of residence
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Old Nov 4, 2024 | 04:28 PM
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Now if you lived in the majority of the world you would have a massive 66 Litres
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Old Nov 4, 2024 | 07:17 PM
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2011 GLK 350 4Matic
I have a 65,866cc tank in my 2011! Eat your heart out. Now I have to work on my MPcc though - I'm only getting .0063 MPcc...

Last edited by habbyguy; Nov 4, 2024 at 07:45 PM.
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Old Nov 4, 2024 | 07:23 PM
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Originally Posted by Silver Shadow
Yes but 17.4 US Gals is 14.48 Imp Gals.
Right, but, you're measuring distance in km, so it's still going to be a big number...
Originally Posted by habbyguy
I'm only getting .0063 MPcc...
Shouldn't you be figuring mm/cc? .0063 M/cc = 10139 mm/cc

Last edited by John CC; Nov 4, 2024 at 07:47 PM.
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Old Nov 4, 2024 | 07:46 PM
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2011 GLK 350 4Matic
Anyone filled up with non-ethanol gas and checked the effect on their mileage?
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Old Nov 4, 2024 | 08:07 PM
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Not really the answer, but we used to have a flex fuel vehicle and E85 over E10 was good for about a 30% hit on the mileage.
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Old Nov 5, 2024 | 12:00 AM
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Originally Posted by andreigbs
Not likely, since the GLK is based on the w204 C-class platform.

And the GLK's gas tank is 17.4 gallons which is larger than other compact SUVs in the same class.

If longer range is what you're after, the diesel option can go up to 700 miles on a full tank. But then you're going to deal with all of the issues specific to diesels that most people (1) don't know about, or (2) are not able to afford maintaining.

Just saw this on the Must Have Options thread: 916 FUEL TANK WITH LARGE VOLUME - VOLUME 1 - don't really know what that's all about...
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Old Nov 5, 2024 | 11:29 AM
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2013 glk 350
I think a major waste of money , I get 18.5 just city driving . I can imagine the cost would be crazy and things won’t fit.
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Old Nov 5, 2024 | 09:16 PM
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Originally Posted by MBKLUE
916 FUEL TANK WITH LARGE VOLUME - VOLUME 1
I have that option. As far as I can tell, it's still about 17.4 US gallons. The most I've put in is 16.3 gallons. The reserve light is supposed to come on at 2.1 (US) gallons.
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Old Nov 6, 2024 | 12:04 AM
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Originally Posted by John CC
I have that option. As far as I can tell, it's still about 17.4 US gallons. The most I've put in is 16.3 gallons. The reserve light is supposed to come on at 2.1 (US) gallons.

Interesting. I don't recall that being an option when I ordered my Gasser. Maybe it was just an option for the Diesel although that wouldn't make much sense since the Diesel gets much better fuel mileage to start with. Maybe there was a little more free space available with just the DEF tank vs. a spare tire??
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Old Nov 6, 2024 | 12:06 AM
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Originally Posted by MBKLUE
Just saw this on the Must Have Options thread: 916 FUEL TANK WITH LARGE VOLUME - VOLUME 1 - don't really know what that's all about...
That’s the fuel tank every US GLK350 I have seen comes equipped with. It’s 66 liters or 17.4 gallons. At 28 MPG highway that’s 450 miles cruise range before the “buy gas” light comes on.
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Old Nov 6, 2024 | 01:33 AM
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Originally Posted by Odd Piggy
That’s the fuel tank every US GLK350 I have seen comes equipped with. It’s 66 liters or 17.4 gallons. At 28 MPG highway that’s 450 miles cruise range before the “buy gas” light comes on.

Understood but I still don't get the "option" part, unless, that applies only to the Diesel. What I do know is I hang my head in sadness as I watch the Diesel GLKs drive by as I'm standing at the gas station filling up again :-( I always wished there had been the option of a smaller-engined Gasser for the U.S market.
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Old Nov 6, 2024 | 02:24 AM
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We replaced an ML350 with the GLK 350, so the GLK’s mileage looked great in comparison. But, yes, a 200-220 HP engine would have been sufficient. But the Mercedes gasoline engines in that power range were 4 cylinder. MB engineering was falling in love with 110 HP per liter and had not worked out the kinks. The 1.8 L M271 & 2.0 L M274 were really not anywhere near as good as the bigger V6s. The M272 is 77 HP/L and the M276 is 86 HP/L.
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Old Nov 6, 2024 | 04:56 AM
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The smaller the motor , the higher the HP per liter, the shorter they last. These new mini motors in some SUVs I think are a joke. They won’t last.
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Old Nov 6, 2024 | 10:04 AM
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Originally Posted by Odd Piggy
. MB engineering was falling in love with 110 HP per liter and had not worked out the kinks. The 1.8 L M271 & 2.0 L M274 were really not anywhere near as good as the bigger V6s. The M272 is 77 HP/L and the M276 is 86 HP/L.
Interesting, seems they got the kinks mostly worked out in their diesel engines at least (emissions system aside).

The OM651 is a 2.1L 4-cyl that puts out 201HP in stock form. That's 100HP/L and 369 Lbs-Ft torque to boot.
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Old Nov 6, 2024 | 12:27 PM
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Originally Posted by John CC
I have that option. As far as I can tell, it's still about 17.4 US gallons. The most I've put in is 16.3 gallons. The reserve light is supposed to come on at 2.1 (US) gallons.
I just went back over my records, and the most I ever put in was 15.56 gallons. I guess I was being a little more cautious than I realized. ;-)
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Old Nov 6, 2024 | 12:27 PM
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Yes, but they've been making 4 cylinder diesels for 40+ years.

110 HP/L or even more is OK if the engine is designed from the ground up with the proper metallurgy, bearings, wear surfaces. But on the M271 they took a 150 HP engine and stuck direct injection and a turbo on it without much else. They work, but require a lot of maintenance beyond what the owners manual indicates. Then they didn't do a much better job on the M274 or M260/264.

We've had Benzes for decades now and at least 2 in the family and business fleet. There had never been a critical engine failure on any of the V6s or V8s. Since we started getting 4 cylinder gasoline engines in 2013, we've had 3 that failed seriously. I'm "falling out of love" with these turbo 4s.

I think we're getting off the original topic.
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Old Nov 6, 2024 | 01:25 PM
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Originally Posted by Mmr1
The smaller the motor , the higher the HP per liter, the shorter they last. These new mini motors in some SUVs I think are a joke. They won’t last.
I was driving behind a SUV just yesterday. By the engine noise it was easy to tell that it was struggling to maintain highway speed. It was constantly(every 5 seconds or so) downshifting out of top gear, and then back into top gear. I was thinking the same thing you just stated.
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Old Nov 6, 2024 | 04:34 PM
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Originally Posted by andreigbs
The OM651 is a 2.1L 4-cyl that puts out 201HP in stock form. That's 100HP/L and 369 Lbs-Ft torque to boot.
That's about the same as what I was getting out of my 1993 GM 6.5TD (180hp/360ft-lb, IIRC)

Originally Posted by MBKLUE
Interesting. I don't recall that being an option when I ordered my Gasser.
I don't think it I an option in the common sense of the word. It's listed on the build sheet because it is on the car. The sheet also lists the front drive shafts, because it has the 4Matic option, but I wouldn't say there was a choice of drive shafts. (All US GLK250s were 4Matic, as far as I know.)
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Old Nov 6, 2024 | 05:16 PM
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Originally Posted by John CC
All US GLK250s were 4Matic, as far as I know.
Correct, sir.

Not sure if that means ALL vehicles equipped with the OM651 were also 4Matic, such as the E-class cars or the Sprinters, but every GLK250 certainly was and every ML250 and GLE300d as well.
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