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#1
05-13-2008, 03:55 PM
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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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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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#2
05-15-2008, 03:12 AM
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Anyone?
__________________
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
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
05-17-2008, 05:48 PM
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What pressure would I be looking for?
__________________
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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#5
05-17-2008, 07:59 PM
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Quote:
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2005 Pathfinder LE 2001 E55 1998 M3 1982 320i
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#6
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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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#7
05-18-2008, 01:17 AM
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Source restricted?
The filter was replaced within the past few thousand miles.
__________________
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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#9
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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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#10
05-20-2008, 05:38 PM
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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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