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#1
12-25-2019, 12:39 PM
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W124 m103 fuel pressure regulator
Hi guys I am getting fuel in the line (vacuum) coming from the fuel pressure regulator.
My car idles at around 1800 and is hard to start when cold. Car has 58,000 miles Should i replace the FPR? Thanks 
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#2
12-26-2019, 08:53 PM
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The "vacuum" line is only to allow a failed regulator to vent gasoline back into the breather hose instead of leaking externally, possibly causing a fire. It may have no impact on cold starting but should be replaced regardless. Also check to see if it has contaminated the oil with fuel. Sniff the dipstick, if you can smell any hint of gasoline change the oil.
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 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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