Has anyone replaced the cigar hose with a regular hose? What does the cigar hose do and when does it need replacing? I am wondering if it has something to do with the engine shaking at idle, which seems to be worse in hot weather.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Yes you can put a straight hose on. Two thing can happen. Nothing, or you'll get a pulsing noise and possibly shakey idle. I have experienced both. On my wagon there is a pulsing noise and some vibration when I have straight hose on, and not when I have a cigar hose. In my 240 there was no change. If you have the pulsing it's not hurting anything it's just noise.

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I've replaced with a regular fuel hose on a 300T, haven't noticed a difference. Supposed to suppress "shock" of fuel from backing up at idle.

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83 SD

84 CD

Most people who have replaced it with straight fuel line say they do not notice any difference. A few have said they could feel or hear the fuel pulses in the hose. Someone suggested splicing in a prefilter as kind of a shock absorber. That seems like it would work, although I don't think we have had any reports from someone who actually tried it.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

My 409d had a hose with a filter in the place of the cigar hose (if it had one originally??). Seemed to work fine.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

That's seems like it would be far more trouble than it is worth.

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"There are a lot of pebbles on the beach, but there's a Little Rock in Arkansas."

Logan

1983 300D Turbodiesel
1976 300D Rustdiesel

Yep, I agree. A new cigar hose is only 11 bucks, but some people would rather find the cheapest alternative.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

the hose on my 240d is replaced with a straight viton hose and i noticed no effect whatsoever. the idle was never exactly glass-smooth anyway, though, so ymmv.

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1973 280 - Current Project Car
1979 240d - 100% Stock
1982 380sl - 100% Stock
1985 190e 2.3 - Heavily Modified

The cigar hose isn't that expensive...

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I used a straight hose because I wanted it longer than stock. Also, I put a boat squeeze ball-type priming pump because I was bloody sick of the priming pump on the fuel pump.

For a shaky idle, I would be looking at timing, valve adjustment and rack dampner. Also, if you have B20 in your area, it does a fantastic job of cleaning out the fuel system.

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Sam

84 300SD 350K+ miles ( Blue Belle )