View Full Version : rear tank over flowing????
04-07-2009, 01:54 AM
walking out to my truck(90 f-250 5.0L) after l got off work l saw a new gas stain on the road and the mud under my rear fuel door was wet so l took off the cap and gas came pouring out.
l syfened out a bunch into my jerry can and left for home, after scratching my head for a bit.
when l got home l opened the door again and it blead off vapour.
l was running on my front tank and what l am thinking is insted of the gas returing to the front tank it is getting pumped into the rear????
has anyone ever heared of this? or have a fuel system diagram?
04-07-2009, 03:21 AM
Sounds like a one way check valve is stuck open.
04-07-2009, 07:24 AM
I'ld say that your tank selector isn't switching the return line.
04-07-2009, 09:59 AM
try running on yur rear and see if it still overflows
04-07-2009, 10:32 AM
will let you know how it works out
check the vent maybe there was a pressure build up . was it sitting in the sun?
04-07-2009, 12:49 PM
not realy l filled it up befor work at around 1:00pm and saw it over flowing at 11:00pm.
just got back from driving around on the rear tank and it sure as hell is over flowing again.bat1bat1
l am about ready to throw a match at it.
also have another drivability isue that l am trying to work out. unrelated. ball joints or wheel bearings or somthing.
04-08-2009, 01:02 AM
ok l am beginning to think that the evap system isn't working causing a preassure build up and the only vent would be through the filler cap.
because l after l shut the truck off and syphoned about 30L out of the tank. l came back a few houres later and opened the cap again and sure enough there was a hissing comming from it.
could be the breather clogged up?
or is that too simple
hows the front bumper?
04-09-2009, 08:22 AM
had a same problem with a customers truck last month
it was the switching vavle filling the rear tank
put a new valve in and it was problem solved
04-09-2009, 10:24 AM
Have a look down the filler pipe with a match...
04-09-2009, 09:24 PM
been working all through the day the past few so l havent had a chance to cheeck it out. hope to have it figgured out this weekend.
front bumper is pulled away from the fraim alittle where l put the strap though 2 weeks ago. any one know where there is a tree l can use to push it back in with?
04-10-2009, 10:40 PM
well drove around all day today on the front tank with no problems and havent ran out of gas yet so l am guessing that the return lines are in proper working order and just the rear tank isn't venting.
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