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Unused port on fuel sending unit?? pic inside

DTL

New member
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Location
Bakersfield, CA
I saw in my brief search that a capped 3rd line leaving the fuel tank is not uncommon on these trucks, but does anyone know if it is a vent or a pick-up? I'm looking at adding an in-bed fuel tank and I'm wondering if I can use this spare fitting as a fill point.

Edit: picture was upside down. d'oh! aua
 

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dstang97

Well-known member
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Clover, SC
I dont want to guess, but I think that the gassers and the diesels use the same part. That would go to the charcoal canister. Hopefully someone will know.
 

DTL

New member
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Location
Bakersfield, CA
I *could* just pull it and see, but as you can tell from the picture, GM (in their infinite wisdom and foresight) placed the sending unit EXACTLY between the cab and bed. Basically, they force you to drop the tank to pull the sending unit. Of course, I have a full tank at the moment. Jerks.
 

blackhueys

Member
197
-9
18
Location
mn
draining the tank is what its for. the stock fuel line has a t fitting up by the pass side tire area just under the flap this is where the arctic heaters connect to.
 

notsosanestan

New member
270
1
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Location
NNJ
would be a good spot to pressurize the fuel system when trying to start her after changing filter or running out of fuel
 

ssgtcampbell77

Staff Sergeant
227
1
0
Location
St Louis MO
I saw in my brief search that a capped 3rd line leaving the fuel tank is not uncommon on these trucks, but does anyone know if it is a vent or a pick-up? I'm looking at adding an in-bed fuel tank and I'm wondering if I can use this spare fitting as a fill point.

Edit: picture was upside down. d'oh! aua
Your middle line is a drain. The line closest to the cab is your return and the line closest to the bed is your feed. Reference TM 9-2320-289-20 page 3-32 and figure 3-13. And Im wearing flip flops.
 

DTL

New member
43
0
0
Location
Bakersfield, CA
I was able to verify that it feeds from the bottom of the tank. We needed a little fuel for the heater the other day so one of the guys pressurized the tank slightly. We were able to freely draw the 5gal we wanted from that capped port. Hopefully I'll never *need* to drain that tank, but if I do, it's cool that there's a fitting in place to do so!
 
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