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  #1  
Old 05-13-2008, 03:55 PM
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Thumbs up CIS injection fuel pump questions

300sel -

From what I've gathered on the search here, when the pump is very loud it's on its way out.

Is there a way to test pump pressure at the CIS distributor before I go purchase a new pump?

Thanks!

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'90 300SEL 326k

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  #2  
Old 05-15-2008, 03:12 AM
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Unhappy

Anyone?
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #3  
Old 05-15-2008, 07:21 PM
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yes, with a fuel pressure guage. You can also test it at the pump outlet.
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  #4  
Old 05-17-2008, 05:48 PM
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What pressure would I be looking for?
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
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  #5  
Old 05-17-2008, 07:59 PM
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Quote:
Originally Posted by Hit Man X View Post
What pressure would I be looking for?
CIS runs @ 70 pounds/square inch.
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  #6  
Old 05-17-2008, 09:32 PM
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If its running it probably has the right pressure. CIS does not like variable pressure. The whole system is based on hydraulic control and a fixed pressure is the heart of it.

The pumps make noise when the filter is restrcicted and when the source is restricted also.
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  #7  
Old 05-18-2008, 01:17 AM
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Thumbs up

Source restricted?

The filter was replaced within the past few thousand miles.
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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #8  
Old 05-18-2008, 10:32 AM
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Check the electrical current draw. This will increase as the pump ages. It also increases as the filter gets clogged.
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  #9  
Old 05-18-2008, 01:13 PM
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The filter is not the source, it is after the pump. The source is the tank and the screen and baffle system inside.
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  #10  
Old 05-20-2008, 05:38 PM
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Thumbs up

Yeah, could the screen in the tank cause the pump to be loud?

The car has around 265,000 miles on it hence my reason to question the pump. My 300SE's had the pump replaced and the 560 has around 140k I think only.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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