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  #1  
Old 02-09-2011, 04:38 PM
JamesDean's Avatar
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Fuel Pressure Regulator Part Numbers

I was wondering if anyone knew teh difference between the various fuel pressure regulators.

I have one for m103 engines and I tried to use it on a m117 and the car wouldnt stay running. Obviously its the wrong part, but I was wondering what the difference between the m103 and the m117 version FPRs is..

The FPR on my buddys 560SEL, you can feel air/vapor flowing out the back of it (where the nipple is)..its not a liquid coming out. So we swapped the one from the m103 in and no longer had that characteristic but the car woudln't stay running..

Just looking for some info.

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  #2  
Old 02-09-2011, 04:54 PM
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Pressure regulation is the difference.

The 1986-91 M117 engines run at 6.2-6.4 bar, and the M103 runs at 5.2-5.6 Bar.
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  #3  
Old 02-09-2011, 05:11 PM
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I wasn't able to find the pn for the fpr in the epc so, I couldnt see what other models carried the same fpr. Would a 84 or so 500SEL be a candidate?

Thanks for the info. Good stuff to know.
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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!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
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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  #4  
Old 02-09-2011, 06:15 PM
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Pre 1986 cars use a different system that has the regulator in the fuel distributor.
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  #5  
Old 02-09-2011, 06:29 PM
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Ah alright so is this a m117 only part of does the m116 share the same?
__________________
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!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
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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  #6  
Old 02-10-2011, 09:15 AM
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Yes, 4.2L & 5.6L use the same part.

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27 Years M.B. Shop foreman (dealer)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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