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Old 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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Old 10-18-2004, 01:34 PM
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bounce!!!
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Old 10-18-2004, 01:41 PM
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Quote:
Originally Posted by kmaysob
bounce!!!

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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Old 10-18-2004, 01:42 PM
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Yes

Vent is plugged.
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  #5  
Old 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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