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#1
12-12-2006, 07:43 PM
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500E Fuel Problem
Last night I attempted to put some techron in the tank and upon opening the filler cap, gas exploded out at me. Probably a pint or more. Soaked me!
Car had been sitting for 2 weeks. Other interesting points: Last time I drove it, I smelled gas as I exited the vehicle in my driveway. After changing my fuel soaked clothing, the car cranked a long time before it started.....like there was no fuel in the lines. Fuel pump was buzzing as normal. I seem to recall it taking a while to start last week as well, but not as noticable as last night. No puddles under the car today. Any ideas? What would seemingly cause pressure in the tank and loss of pressure in a line to the engine?
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Bryan Harter 1992 500E Smoke Silver 2002 CLK55 AMG Cab Silver/Black 2001 Harley Fatboy - Pearl White 2004 F150 FX4 Silver/Grey 1969 GTO Liberty Blue 1956 F100 Black 
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#2
12-13-2006, 08:14 AM
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Sounds like a purge system problem.. possibly a problem with the charcoal cannister system.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
12-13-2006, 09:08 AM
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Indeed...I believe you can get a gas cap w/ a vent hole.@ least I've seen MB caps w/ small holes in them. You might also crawl under the car w/ a vent system diagram..make sure all your lines are clear/not pinched etc.
Next time back off the cap Very, Very slowly and hold it against the filler neck while the pressure slowly escapes. Jonathan
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#4
12-13-2006, 10:17 AM
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Wow, that's weird. Was the tank topped off? Was the engine running when is sprayed you? On a side note, when I start my 500E you can here the return line spraying in the tank for about 30 seconds. Maybe there's a design flaw in the larger tank. My other 124's don't do that.
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Current Stable: 01 ML55 AMG 92 500E (a few mods) 87 300E (lots of mods) 00 Chevy 3500HD Diesel Box Truck 68 18' Donzi Marine  06 GT i-Drive7 1.0 Mountain Bike (with GPS!  )PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320 
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