Anyway to repair, rather than replace, the shut off valve?
 

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.

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.

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.

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.

..........PEH..........:D

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

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

You could just buy a nice mity vac and run a length of vacuum tubing into the passenger compartment. Pump it a few times and you're golden. Plus you get to buy another tool, one that will help you track down your other vacuum leaks from re-using old vacuum fittings.:D

The gold will quickly turn to stone if the diaphragm is ruptured.............

If the guy is frugal enough to want to repair the diaphragm, he aint going to want to buy a Mity Vac. He needs to use his god-given Mity Vac found in his cheek muscles. If he gets desperate he should be able to insert a small vacuum guage in one side of his mouth while sucking on the vacuum line in the other.

.........does the gauge come with a 90 degree swiveled fitting so that he can read it during this evacuation procedure?

.........and, does the gauge have a "head mount" so that it won't fall out??

Can a normal human bean generate enough suction to close the fuel shutoff valve?

Easily.

At one time I believed it to be impossible, but, our friend out in Colorado has proven me wrong...........whether that mouth can be considered representative of the entire forum population is still questionable.:D

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

Yes, but a vegetable bean cannot......:D:D

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

Us Mercedes diesel owners are suckers, in a way?:D

Have you tried it Brian? I gotta give it a shot, um, I mean a suck sometime.:D

Last year during a winter cold spell, my 77 300d began to suffer from a vacuum leak. Not having a garage and unwilling to trace down a vacuum leak outside in the cold weather, I put a rubber vacuum hose on the shut off valve and ran it out the hood at the cowling, leaving a few inches dangling there so I didn't have to open the hood every time I needed to shut off the engine. I'd give a couple of quick sucks and off it would go.

..........now that's a scene that could only be described as follows:

priceless.:D

I have a used, yet working shut off valve, if interested.

So many easy jokes can follow that one. :D

shipping
 

As if he'd really pay to ship it?:D

I must say, the thought of my favorite mercedes philosopher/theologian, generating enough vac. (himself) to shut off his car....is well, as Brian put it, priceless.

My wife was unwilling to drive the car under those circumstances even after I showed her how she could shut if off while feigning an inspection of the windshield wipers.

If your real cheap, just pop the hood and shut it down manualy. :D

No seals to fix
 

Ok, I get the picture. I thought maybe it had some silly little 5 cent rubber seal or O-ring that needed replaced, but from what I'm reading, it's all got to go. I picked up the part and ready to install it.

jeff

Read the threads on runaway diesels. You have to be careful when installing the valve because if done incorrectly, the engine can run away once started.

Did you confirm that the problem actually lies in the shut off valve by testing the valve by itself independent of the rest of the vacuum system?