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Old 08-10-2015, 11:09 AM   #1
Join Date: Mar 2015
Posts: 66
78 Dodge sending unit question

So after out trip, went well. I did have a question. The fuel sending unit in our tank, which is working fine. Has 3 hoses comming out. One to the motor, one Above the sending unit (think it's a vapor system), and one that is capped off? What is the capped one for? I can blow in that line nothing comes out either when use a vac hand pump on it. The way it was capped with a chunk of hose looked like it was going to my generator box but was cut off on the hose and a plug put in the hose with a band clamp on it. Is that a place somone could plug a line in to or not? If not what is it for? I have the on board generator plant bit it needs fuel. I have a can that I would feed it from if needed to use it but it's not a good solution. Would rather it pull from the tank.

Any thoughts?

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Old 08-10-2015, 09:43 PM   #2
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Location: Powell River, B.C.
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Going to need some more info.
Class A chassis ? C ? Plastic tank ? Metal ?
Class A with a metal tank, Dodge bought the tanks from an aftermarket supplier and that tank could have had other applications that required the caped line.

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Old 08-11-2015, 12:34 AM   #3
Join Date: Mar 2015
Posts: 66
I have been told the line is only fed to 1/4 tank. I have not tested this yet but, I only tried to pull vac on the line under 1/4 so it makes sense that it is not working.
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