My car is dieseling, (won't shut off for 6 seconds or so after the key is off) so I wonder if there's anyway to repair the shut off valve than spending $35 on a new one.

Thanks,

Jeff 1991 300d, 114k

Nope.

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Try checking for vac leaks, as the shutoff valve is vac controlled. If you push the stop lever by the valve cover, does it still take so long?

-Joey

That's probably one of the cheaper parts you are going to buy.

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00 E420
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the little diaphram inside gets a tear in it and causes the vacuum to leak. The valves i believe are crimped together. So if you know some way of undoing the crimp and not effing the whole thing up in the process you are still faced with finding a diaphram or similar material.

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

Put a vacuum line to the shut off valve and give a couple of strong sucks on it before condemning the valve. It could be a vacuum leak elsewhere.
A really frugal person might figure out how to disassemble the valve and repair the tear with Goop or something.

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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

..........PEH..........

First thing that popped into my head also.....

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'05 Acura TL 6MT
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Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

He'd use goop on a cracked cylinder head..........

This is very good advice for someone wanting to minimize repair costs... before you replace the valve, be sure it is broken!

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1985 MBZ 300DT
1969 MBZ 220d
1984 MBZ 300TDT
1981 VW Vanagon

This is about the very first advice given concerning the car not shutting off.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Us Mercedes diesel owners are suckers, in a way?

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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