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  #1  
Old 05-22-2010, 07:59 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,038
560SEL Fuel Pump Operations

Hey everyone,

I have a quick question, my buddy has a 560SEL.

When you turn the key, normally (on my m103 & m116) you hear the fuel pump kick on and then off in short order.

On his m117 the fuel pump kicks on and continues to run. Is this normal operation?

Or is something wrong, if so any ideas as to what?

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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
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  #2  
Old 05-22-2010, 10:40 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,038
Problem solved.

PO ran a wire from the engine bay direct to the fuel pumps themselves.

Looks like one of them went bad and took out part of the connection to the fuel pump relay (all melted) and he decided to bypass it.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #3  
Old 05-25-2010, 01:42 PM
Registered User
 
Join Date: Jul 2008
Posts: 1,236
Your PO isn't as clever as he thinks.... Doing that causes a couple of things; firstly, the high RPM fuel cut-out is now bypassed, making it possible to rev above redline. Secondly, it puts more wear on the pumps.

If you hadn't discovered that little hack, my first guess would have been that your fuel accumulator was shot and your fuel system was never getting fully up to pressure.
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
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  #4  
Old 05-26-2010, 06:44 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,038
I'd happy to report that once we repaired the damaged, the pumps operated as they normally should and the car started fine. Aside from some vacuum leaks and subsequent stalling issues.

Presumably, he didnt realize he toasted the fuel pump relay's one pin (i believe it was pin 6 (30-opens for one second to prime system))..and just wired them to the ignition.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
Reply With Quote
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