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+--- Thread: pressurized fuel tank (/showthread.php?tid=3387)
pressurized fuel tank - barrote - 02-24-2012
hello people,
i found out my 124/ 93 had a pressurized fuel tank, well the thing is that after a few mods in the engine, removing EGR and fan some other wires throttle valve etc, the pressurization desapeared along with the pressure feeding to the pre pump. the thing is when i need high feeding to the IP i dont have it anymore. feels like filter clogged.
anyone know how this pressurization is made?
Thanks
RE: pressurized fuel tank - bad3gakk - 02-24-2012
I would guess exhaust.. ive seen a few petrol cars with a line from the egr to a canister with a filter in it.. and a line from there to the tank...
RE: pressurized fuel tank - barrote - 02-24-2012
thanks for your guess, is not the case in this w 124, witch the pressurization goes in the tank through fuel return, i just dont know where it is generated, and u maybe right EGR , i removed EGR one day. the thing is i haven't seen over there no connections of whatsoever.
regards to norway
RE: pressurized fuel tank - bad3gakk - 02-24-2012
What engine do you have? 300dt?
RE: pressurized fuel tank - barrote - 02-26-2012
nop, 305.011 N/A.
RE: pressurized fuel tank - aaa - 02-26-2012
If it's diesel then the tank is not supposed to be pressurized.
RE: pressurized fuel tank - sassparilla_kid - 02-27-2012
My tank (w123) build up pressure, but I think that is due to temperature changes
RE: pressurized fuel tank - Snipe656 - 02-27-2012
(02-27-2012, 12:02 AM)sassparilla_kid My tank (w123) build up pressure, but I think that is due to temperature changes
My 1985 300SD builds up pressure, matter of fact I filled the car up last week which was the first time since August 2010. It had so much pressure that it was a bit of a pain to get the fuel cap to twist off.
RE: pressurized fuel tank - barrote - 02-27-2012
hy guys,
i understand the temperature pressure build, but think it strange, when the fuel losses temp the pressure should go away, right like pascal´s law of pressure PV/T
well my problem is that when it was pressurized worked better, lol.
Maybe u can answer me a silly question, where does the vacuum breeding goes, inside the engine or some how goes to to fuel return line through IP, i watched very often several bubbles in the return line, to much of them to be from some air leak in the system, and of course one device is right close to the other.
thanks
RE: pressurized fuel tank - raysorenson - 02-27-2012
There is a check valve under the vehicle that allows air into the tank. One end is open to the asmosphere with a rubber bellmouth at the open end facing down.
It would be boyle's law that applies here, BTW:-)
RE: pressurized fuel tank - barrote - 02-28-2012
anyway, Boyle´s law pascal´s matter little , thing is that with temperature pressure will raise and the oposite happen, and volume will decrease with pressure at least for gasses, and for liquids if are able to compress the enough the will vaporize and same applies.
anyway thanks for correction
regarding the so famous valve u are talking about , humm in my tank that valve only allows pressure to get out when reaches a certain amount of pressure. that's why i´m having problems with the feeding.
anyway i will check it out to be sure.
