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  #1  
Old 11-24-2020, 05:17 PM
MB300se65's Avatar
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Looking for vacuum hose schematic for 91' 300sl

Hey,

I posted earlier asking about the location of where the vacuum hose from the fuel pressure regulator attaches to the vacuum source, which I think goes into the intake manifold and got no response.

So with not getting any response am looking for a vacuum hose schematic for 91' 300sl so I can locate it myself.

Can someone please help me!

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Old 11-24-2020, 07:04 PM
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Originally Posted by MB300se65 View Post
Hey,
I posted earlier asking about the location of where the vacuum hose from the fuel pressure regulator (FPR) attaches to the vacuum source, which I think goes into the intake manifold and got no response.
So with not getting any response am looking for a vacuum hose schematic for 91' 300sl so I can locate it myself.
Can someone please help me!
The hose from the FPR is a vent/leak line. It will be connected to an atmospheric location, sometimes the cam cover, sometimes to the air guide under the fuel distributor, but not to a vacuum source.
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Old 11-24-2020, 09:00 PM
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Thank you Frank...I've sent your response to my mechanic!
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Old 11-24-2020, 09:03 PM
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Frank,

Would not having this hose connected to the correct location be the cause of my hard start problem?

MB300se65
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Old 11-25-2020, 12:07 AM
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Originally Posted by MB300se65 View Post
Frank,
Would not having this hose connected to the correct location be the cause of my hard start problem?
MB300se65
As a general matter, no. If the vent of the FPR were to be connected to vacuum, there might be stumbling & stalling after start, and after the ECU had gone into closed loop. The cause of that would be low fuel pressure.

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