M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

99 ML430 starting problem

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Old 06-10-2016, 05:43 PM
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2007 Mercedes ML350, 1999 ML430
99 ML430 starting problem

I have a 99 ML I'm having a problem with. When I go to start it, it will run through the start cycle (turning over) but will not start. I will turn the key back to off and start it again and it will then start and run. This happens almost every time I start it. It sometimes starts a little "hard" on the second try but it always starts. If I shut it off for a minute or two, it will usually start on the first try. Any ideas? Thanks!
Old 06-11-2016, 04:53 AM
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It appear to be a fuel delivery problem.

Working with a cold engine, turn the key to pos. #2 and leave it there for 15 sec. and then turn the key to start.

If it does start, then the problem is the fuel filter or the fuel pump, or both.
Old 06-12-2016, 11:29 AM
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Thanks, Maj. I tried that to no avail. We'll do the fuel pump.
Old 06-12-2016, 08:23 PM
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Did the eng. start after the 15 sec. wait?
Old 06-12-2016, 10:34 PM
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No, it didn't. It did the same thing it usually does: I restart it and it starts up.
Old 06-13-2016, 07:02 AM
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Before you buy anything, why don't you check the fuel pressure with a fuel pressure gauge?
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Old 06-13-2016, 11:10 AM
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I'll try that. I need to find a fuel pressure gauge. Thanks!
Old 06-14-2016, 03:16 AM
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Originally Posted by chopperpilot
I'll try that. I need to find a fuel pressure gauge. Thanks!

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