Fuel pump /s on 1991 300GE (463)

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RichardH
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I have a 1991 300GE (463). Can anyone please clarify whether it has one or two fuel pumps? The first one would be at the fuel tank, but I am told by the workshop that repairs the car that the MBenz catalogue seems to indicate another, which is under the nearside rear wheel arch. Can this be a second fuel pump or is it some other mechanism? Thanks, Richard 

M2dxb
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Re: Fuel pump /s on 1991 300GE (463)

Hi, I ran a 300GE for 7 years, same year. 

Can confirm it had 2 fuel pumps, one under the fuel tank (only accessible after you remove the steel tank protector) and another in the rear wheel arch, a bit more accessible but to get better access remove the arch/wheel liner (and jack up the car if you really want more space). The second one is in a group with a filter and pressure valve.

Jdring
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Re: Fuel pump /s on 1991 300GE (463)
gooch
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Re: Fuel pump /s on 1991 300GE (463)

Jdring wrote:

Good info here:

https://www.g-archiv.com/stuff/service-manuals#w463 

Page 42.

nice info !

RichardH
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Re: Fuel pump /s on 1991 300GE (463)

Great information, thank you very much.

I am trying to deal with a whine that comes from the fuel pump/s/ Pump closest to the tank has been replaced, but the whine is still evident. Difficult to identify which pump it is coming from - perhaps the whine is just the noise it makes? It will be expensive to replace the other pump just in case it is the culprit. Any views please?

JASONGDS
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Re: Fuel pump /s on 1991 300GE (463)

Have you changed the fuel filter?

RichardH
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Re: Fuel pump /s on 1991 300GE (463)

I don't think that the fuel filter has been changed - just the one fuel pump. Could the fuel filter be causing the noise?

Jdring
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Re: Fuel pump /s on 1991 300GE (463)

My single fuel pump (230GE) was replaced, twice, and it whirrs, not whines.  On ignition, it runs for 3 seconds ish and stops as pressure is reached.  Then it runs continuously as the engine is running (and cannot hear it).

With a ramp, its not so expensive to drop the tank straps and tank and replace the other.  About 1-2 hours.

JASONGDS
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Re: Fuel pump /s on 1991 300GE (463)

Not sure,  but worth changing 1st as a preventive measure and I assume cheaper than a pump

prwales
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Re: Fuel pump /s on 1991 300GE (463)

Confirm the previous statements 2nd pump under the rear passengers side wheel arch behind  the plastic protector

RichardH
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Re: Fuel pump /s on 1991 300GE (463)

Thank you for helpful comments. Will be replacing the fuel filter and possibly the second fuel pump too, if needs be. Will revert with any useful information after the follow-up workshop visit.