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'83 Mercedes 300D will not start when warm

Motor Vehicle Maintenance & Repair Asked on May 7, 2021

The car runs great when first started, great pickup, etc. However, if I stop and shut off the engine, it will not start back up. At times I can pump the accelerator 5 or 6 times and then it will start if I keep my foot off the pedal, but not always. Any suggestions?

The glow plugs are good, I’ve recently adjusted the valves, filters all replaced, linkages replaced, turbo working properly. The first symptom was the car having no power or losing power on hills, but that is no longer the problem with the mentioned fixes. Just over 200K on the odometer. Another recent change is that I’m not driving the vehicle as much.

2 Answers

Sounds like a lack of fuel getting to the engine.

Get it hot, turn it off pull a fuel line and crank the engine, see if any diesel comes out. It could be a fuel line softening up when it gets warm and pinching shut due to the suction from the pump. If thats the case, replace your fuel lines with proper diesel rated lines.

Answered by Matt Bear on May 7, 2021

agreed that this seems like a fuel problem. the easiest and most important things to check are the two fuel filters, one big, one small - replace them. it's also possible to have a clog in the strainer back at the tank.

Answered by Aaron Brick on May 7, 2021

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