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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