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#1
10-18-2004, 04:05 AM
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fuel tank under pressure
i have noticed that my dads fuel tank is under pressure when its been run for the day. mine isnt. does this mean the vent is plugged? the other day i changed his fuel filter and it was squirting fuel so i ran to the tank cap and opened it.pressure released and the flow stopped. my main question is will this effect the performance? 1983 300sd
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#3
10-18-2004, 01:41 PM
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Quote:
That usually causes a vacume.............................but it could cause that too, would hurt nothing to clear it out. Worst case is it will be no different afterwards.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#4
10-18-2004, 01:42 PM
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Yes
Vent is plugged.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#5
10-18-2004, 01:46 PM
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kmaysob,
Yes. As the ambient temperature increases the fuel expands and the vapor pressure increases. This process is helped along by the return line from the fuel injection system on the engine back to the tank. If it is cool enough out, a blocked vent will cause the fuel consumed by the engine to make a vacuum in the tank on a journey of some distance. This can cause the engine to shut down and make getting the cap off the filler port very difficult. Next time be sure to notice if the air is rushing into the tank or coming out. In either case though, the vent is not working. Jim
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Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep)
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