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Old 10-20-2004, 06:21 PM
Posts: n/a
87 300SDL just keeps on going

As a new diesel owner, it's the simple things that mystify you. My 300SDL now refuses to stop running when I turn off the key.

I've been trying to decipher the Repair Manual CDROM and figure out what mechanism is supposed to stop the engine, but no luck yet.

Last week I replaced the fuel line feeding directly into the engine (which is when the problem started). The previous one was allowing air into the line. The new fuel line is slightly bigger that the last one, so I assumed that the engine kept running merely because it was getting too much gas. However, I tried a quick fix by tightening a hose clamp to restrict the fuel flow - didn't change a thing. The old girl just chugs along until I get out of the car, pop the hood, and hit the kill switch.

Any wisdom for an aspiring DIY shade-tree mechanic? Will I have to find a smaller fuel line, or does that make a difference? Is it an electrical system that kills the engine?


87 300SDL 289,000miles

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Old 10-20-2004, 06:27 PM
1985 300SD Sady's Avatar
Star Crazy
Join Date: Sep 2004
Location: Cincinnati, Ohio
Posts: 1,038
Check your vacuum lines, the cutoff swich is vacuum operated. The white plastic box next to the ALDA on top of the Injection Pump is the cutoff. Make sure those lines are good, and connected properly.
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Old 10-20-2004, 07:20 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150

Most likely you pulled a vac line off while changing the fuel line.

The brown plastic line is the supply, the brown line with a blue stripe connects to the vac servo on the IP to shut the engine off.

Use the stop lever to kill the engine until you get it fixed.

There is also the possiblity that the servo died, you are about the right milage.

Use a MitiVac hand pump to test -- engine should stop instantly when you apply vac to the servo with the hand pump. If it doesn't, or the vac leaks down, replace servo.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 10-20-2004, 08:39 PM
Hatterasguy's Avatar
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,307
Mine did the same thing the servo wouldn't hold vacuum. They are about $46 for a Bosch metal one. Cheaper plastic ones are less but I hate plastic crap.

2020 GMC Sierra Denali
2007 Tiara 3200
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