Fuel pump, 2002 ML500, how long to replace? - Mercedes-Benz Forum
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#1 (permalink) Old 12-22-2008, 02:04 PM
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Fuel pump, 2002 ML500, how long to replace?

Just curious, how long should it take?

I have the dealer quoting 2 hours to do the filter?????

And then three to four to replace the fuel pump and sender unit?????

Thinking I'm going to have to get this thing towed from the dealer back home.
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#2 (permalink) Old 12-22-2008, 04:43 PM
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"Overcharge" is the name of the game. 30 minutes for the filter and 2-3 hours for the fuel pump, IMO.

Here is the DIY link. Only difficult steps are removing the seats (heavy) and tightening the fuel pump o-ring. If you replaced the CPS you can do this too.


Make sure fuel pump/filter is the underlying problem before you get into this project. Start with the OBD codes if you have a check engine light (CEL) on. On the other hand, fuel filters recommended for replacement every 60k miles as a maintenance. Otherwise it can decrease the lifespan of the pump.
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#3 (permalink) Old 12-23-2008, 04:45 AM
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At least 2-3 hours I would have thought.

Replacing the fuel pump involves quite a lot (removing rear seats, cutting in to the area of the chassis containing the fuel pump etc)

What I hate most about it is the awful smell for petrol which lingers in the interior for weeks!
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#4 (permalink) Old 12-23-2008, 06:22 AM
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The posted labor rate for the fuel pump is 2.4 hrs. The rate for the filter is 1.2 hrs. But these two rates apply only if you are having them replaced separately.

If you are having them replaced together the pump rate would apply and possibly 30 mins. additional for the filter, at that is stretching it. So the total rate should be 2 hrs. 45 mins.
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#5 (permalink) Old 01-06-2009, 04:54 PM
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Well, I was stuck as the car had to drive 600kms the following day with a camper on the back....

That being said, all fixed now and the car behaved perfectly.

Have ordered a fuel pressure test kit and an OBDII tester now, probably the last time it will visit a dealer anyways! Total cost for offsite mobile fault diagnosis & R&R on site was $1,207AU (about $905US).

If I'd done it myself, cost would have been $500AU for the pump ($375US approx). But I would not have been able to go on my trip and would have had a grumpy wife.........
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