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#1
03-23-2011, 01:13 PM
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Testing a FPR (190e)
I purchaced a used "tested" FPR for my 93 190e 2.3 from ebay, received it today.
It will not hold vacuum when I apply it with my mityvac, it just pumps up and the needle goes straight back down. Is this unit defective? I am assuming that when I apply vacuum to it, it will hold. Correct? Thanks guys!  
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#2
03-23-2011, 01:26 PM
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No that is not a vacuum connection. It is a vent in case of diaphram rupture.
__________________
 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#4
03-23-2011, 02:49 PM
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denaliano, on the 124 cars the FPR vent line connects to the bottom of the air cleaner breather hose which attaches to the valve cover. As mentioned if the FPR diaphragm ruptures the vent line directs gas to the valve cover instead of dumping it on top of a hot engine and causing an underhood fire.
It's possible that putting a vacuum on the diaphragm ruined it. Best to verify that the diaphragm is intact before installing a faulty FPR.
__________________
Fred Hoelzle
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