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#1
08-14-2004, 03:52 PM
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280SE Intake Manifold Full of Gas!
Hello all,
I am having an issue(s) w/ a 1978 280SE that I think needs a exorcist more than a mechanic.... The issue of the week is that the intake manifold is full of gas...totally full...to the top... I just put a new (used) fuel distributor on it and it seems to not be leaking (the shelf under the air flow plate and the butterfly into the intake are bone dry). How else can fuel get into the manifold?? I would seriously push this car off a cliff if it didn't have sentimental value to a friend..... Thanks! -Matt-
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress 
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#2
08-14-2004, 10:41 PM
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You have an amazing amount of fuel going in there -- either the fuel distributor is dead or you have a seriously leaking cold start valve. I'd pull the injectors and cold start valve and crank the engine while watching -- gas is gonna be pouring from somewhere! Could also be the plunger seal on the bottom, too, but unlikely. Have a CO2 extingwisher handy, serious fire hazard!
That fuel plump sends quite a bit of fuel up there -- check for a bad pressure regulator or a clogged return line, too (although that usually means no fuel delivered). Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#3
08-15-2004, 03:06 PM
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The cold start valve has been non-functional (impossible to start when cold w/ out a little gas down the intake) but I'm not sure if that would point at it as a cause or rule it out? I am going to check it anyway.
Is it possible that the warm up enrichment valve is the culprit? (located just under the intake at the rear of the block on the drivers side) The plunger was sticking terribly and I did give a light polish w/ crocus emory paper and moved a little better...poss too much so? This car is totally driving me nuts..... (deep breaths......in.....and out........) -Matt-
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress
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#4
08-15-2004, 09:26 PM
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If there is a vent line from the pressure regulator (return side of the fuel distribultor), check for a leaking pressure regulator by pulling the line.
This is fairly common as a failure mode on Volvo EFI systems, can cause the car to stall or fill the crankcase with fuel. Don't know if it applies to K-Jet, but the KE-Jet has the same pressure regulator. Drain the crankcase and discard the oil -- it's gonna be full of gas. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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