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'89 240 won't start.

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Old Sep 15th, 2021, 15:40   #1
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Unhappy '89 240 won't start.

Hi all,

I'm sure a fair few of you are on the Facebook group but thought I would seek advice here too.

1989 240 GLT B230e
Car wouldn't start a few days ago.

Shorted fuse 4 & 6 can hear both the in-tank pump and the main pump running. Fuel pump relay doesn't 'click' anymore with ignition on. Replaced this with a 'known working 2nd hand unit' still no click. Shorted the FPR - pumps run continuously - car now starts, but idle is VERY lumpy/rough needs throttle to keep from stalling and it smells VERY rich.

Any ideas? Could it be a vacuum leak or a fuel pressure problem? I'm not sure what to check next.

Many thanks in advance!
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Old Sep 16th, 2021, 01:48   #2
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Location: Currumbin, Queensland

It would certainly be a good idea to rule out vacuum leaks -- trace every vac hose connecting in the the intake manifold. I had problems with disintegrating injector seals on my B200E causing idle problems. They are not difficult to replace -- there are two sizes that you need.
Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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Old Sep 16th, 2021, 09:30   #3

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Location: Falkirk

If you suspect fuel pressure issues, the pressure accumulator next to the underfloor pump is a place to start.
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Old Sep 21st, 2021, 21:41   #4
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All sorted.
Was a faulty fuel pump relay and a vacuum pipe that had popped off.
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