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Old 07-05-2014, 08:20 PM   #1
Join Date: Nov 2012
Posts: 52
Fuel return?

My C-9 has a fitting on the front of the cyl. head, attached to the fitting is a brass T-fitting with a sensor attached & then another fitting with a 1/2 inch plastic hose looks like it goes toward the fuel tank. This 1/2 inch elbow fitting leaks fuel if the coach is parked facing uphill with a full tank of fuel. Has anyone encountered this and does anyone know the purpose of this 1/2 in. hose.

Wayne Cadieu--2007 CC Inspire 360--Caterpillar C-9.
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Old 07-05-2014, 08:30 PM   #2
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if its like the black plastic hose / tube like you find on cars and trucks for fuel

the parts stores well have parts to help fix it in the HELP part of the store

if you have a long line where you can cut off the bad part then you put it hot water for ?? 10 15 mins some thing like that and really fast push it back on your fitting

late it cool and its just like new

thats now they install them

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Old 07-06-2014, 07:43 AM   #3
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Location: Southern Illinois
Posts: 101
That is the return line from the fuel injectors. The fuel system sends the fuel to the injectors and they pop off fuel to the cylinders at a certain pressure. The excess fuel is returned to the tank through this line. It should be an open line to tank. Trucks and mine equipment has the engine above the level of the tank and do not have to worry about this back flow. The motor home engine is below the tank level so I guess you are getting back flow from the tank through a leaking fitting. I am not sure what type of fitting you have. We used hoses with what is called a banjo fitting with some copper washers used for seals. It sounds like you have plastic lines that are sealed with a little brass ring around the hose in the fitting. If it is that kind you can just cut off the line and slip a new ring on it and put it back together if that is where the leak it. Those rings are not too reusable because when you tighten it up it forms to the fitting. If you take it off it is hard to get it exactly back into the same place and might leak. That type of fitting is found at all hardware stores. We used these fitting mostly for air or water.
Ron KB9TF, Fulltime
2008 Tiffin Phaeton 40 Foot QSH
2011 Honda CRV with Blue Ox towbar and brake
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