Fuel Pump upgrade

[alec.e]

Hello, I have recently upgraded the turbos in my CL500. Everthing is straightforward, howenver the stock fuel pumps are clearly not up to the job.

I have purchased a CL63 AMG fuel pump, but sadly not a straight swap.

Is it possible to add a regular inline fuel pump after the stock one, or add another running parallel in tank with the stock one?

If so what is the best way to wire the new pump in?

I have tried specialists and no-one seems able to help...

Any pointers greatly appreciated
Thanks!

[alec.e]

GreenV8S said:

Running in series is unlikely to give you any benefit. Either replacing the original or running a pair of pumps in parallel seem to be your best options. However, you'd need to find a way to get a free flowing supply to both of them. That might involve modifying the tank. The electrical side of things would be the least of your problems. Is it a dead end supply on that car, or a return loop?

Cheers, it is a dead end system as far as I know

[alec.e]

Here is a photo of my existing pump:






If anybody knows an expert to undertake the upgrade for me, let me know

[alec.e]

Thanks again Chaps...
The stock pump has 4 terminals like the AMG pump, not that clear from the photo

There are a number of explanations why I think the current pump isn't up to the job:
1. Engine is pulling back at certain rpms and under heavy load
2. Other who have swapped turbos on these say the fuel pump isn't good enough
3. Acid from MSL Performance says the fuel pump isn't good enough
4. Look at the dyno graph:

Power drops off from about 5.5k

[alec.e]

As this conversion is a first for Acid, he can't offer any advice sadly. He is in the same boat with his Wiestec supercharged C63 Black!

[alec.e]

Guys, Acid data logged the whole time he had the car on the dyno. As the leading Mercedes tuner in the UK, I am sure he is well qualified to comment, hence telling me I need a better fuel pump. So I have no reason to doubt what he says.

[alec.e]

While I agree in part, his expertise is in the software side of this or installing kits such as Weistec superchargers. As I have said, he has never done this conversion before, and I expect it is probably the first turbo swap on the M278, CL platform in the UK or maybe world. I contacted over major competitors before going to MSL and they never bothered to get back to me...