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Fuel pump or fuel pumps

5K views 5 replies 3 participants last post by  ror600 
#1 ·
Hello guys,
My M5 is a 2006 with 124.000km.
Since some time I began to get engine failure alerts, which were due to a fuel pressure problem.
I got the error 2788, and also 2787 / 2786.
The first times it happened only at wot in 4th gear aboce 7800rpm
Now it begins to happen from 6700rpm. 4th gear as well, never in the lower gears, which seems normal because according to what I read, this error is triggered only above 5000 rpm and during more than 4 seconds.

The error detail says I have 4,6 bar instead of 6 bar fuel pressure.
I have already changed the fuel filter.

As the error detail says the second fuel pump is activated from 5000 rpm and heavy load, I suspect it may be the cause of the problem, so I plan to change it.

My point is I am unable to find where this second fuel pump is located and its part number. All I read from other users, DIY etc, I see only one fuel pump.
And in the realoem parts schemes, I see only one fuel pump which is P/N 16117373524

Can anybody help? Is this the right part? Maybe only one P/N which contains 2 fuel pumps? Or is it a two stage pump?
Thanks,
 
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