Thoughts on rear fuel tank vent mod
#1
Thoughts on rear fuel tank vent mod
I did my front tank mod using the grommet in the tank and got thinking about the rear. Means the bed is so close to the tank in the rear, could a guy just move the vent line to the outside of the 2 inch hose and eliminate the inner hose? What I mean is drilling a hole in the top of the hose close to the tank, then putting a 90* fitting in and a nut on the inside of the hose to make it tight. Then smear some good ol' ford gray silicone around it. Then do the same thing at the top, except put it in the steel part, nut not needed there.
Thoughts?
Thoughts?
#2
When I replaced my tank I drilled a hole in the tank at the top left of the filler neck. But I had a clean tank out of the truck to start with so it was very easy to vacuum out to make sue I got any debris out. I can't really say it works any better cause I mostly fill from a gravity tank so the flow is a little to be desired. One day I will fill at the pump then I can let you know how it worked
#3
I did my front tank mod using the grommet in the tank and got thinking about the rear. Means the bed is so close to the tank in the rear, could a guy just move the vent line to the outside of the 2 inch hose and eliminate the inner hose? What I mean is drilling a hole in the top of the hose close to the tank, then putting a 90* fitting in and a nut on the inside of the hose to make it tight. Then smear some good ol' ford gray silicone around it. Then do the same thing at the top, except put it in the steel part, nut not needed there.
Thoughts?
Thoughts?
If you are referencing drilling through the rubber hose I would probably suggest against that. For several reasons, but primarily if you have both vents in the filler neck almost certainly the vent would get clogged and make it worse than before. The idea of the roll over vent mod is to make it so the tank will vent into the neck at the top above the flow of fuel.
Perhaps I have your plan wrong?
If you were to do it, I would suggest that you use a piece of rubber hose on the tank, come out away from the tank, insert a short section of 2" exhaust tubing drill your elbow into that, and then head up and terminate at the actual filler neck. Likely same flow/filling issue as above, but at least you would be drilling into metal not rubber.
One of these days I would really like to get the SD filler neck with integrated vent line and work on making that fit the OBS. It would be clean and very functional.
#4
I was going to eliminate the inner hose and metal and move it to the outside like you are saying. The reason to do it this way is you can't get at the rollover valve in that tank without dropping it or raising the bed, plus there isn't much room there. I can get the rear hose off without raising the bed. I used the rollover vent on the front tank mod, inner hose is gone, etc. I'd leave the rollover alone in the rear tank. I like your idea of using a pipe instead of the hose by the tank. I will have to check into that.
What I'd have is a 2 inch fill line with a vent line on the outside of the fill line, plumbed in at the top and bottom of the line. If anyone thinks it won't work, let me know. I think it will, but I'm really not sure.
What I'd have is a 2 inch fill line with a vent line on the outside of the fill line, plumbed in at the top and bottom of the line. If anyone thinks it won't work, let me know. I think it will, but I'm really not sure.
#5
Yes, the clearance is very close between the tank and the bed. I used a plastic 90° and it was hitting so I used a spacer between the tank and the upper straps, cut a old conveyor belt. This lowered the tank about 1/4" giving me the clearance I needed. Your approach sounds 'out of the box' thinking, sounds good but don't know if it will work. Good Luck!!
#6
Darin I think I'm following what your saying. I think your new vent would end up getting blocked with fuel as it was being filled and you would lose the vent. It might be hard to keep it from leaking as well.
I have had good luck with just removing the inner hose and upper neck steel insert. With the smaller pump nozzles I can fill it up much quicker than stock, sometimes full blast depending on pump pressure. The truck pump nozzles still require me to slow the flow a little but still much better. My front tank is this way due to my 100 gal aux L tank. I have it plumbed into the neck. I haven't done this to the rear tank yet but will soon.
I'm happy with the improvement, maybe something to try before you move on to a better vent.
I have had good luck with just removing the inner hose and upper neck steel insert. With the smaller pump nozzles I can fill it up much quicker than stock, sometimes full blast depending on pump pressure. The truck pump nozzles still require me to slow the flow a little but still much better. My front tank is this way due to my 100 gal aux L tank. I have it plumbed into the neck. I haven't done this to the rear tank yet but will soon.
I'm happy with the improvement, maybe something to try before you move on to a better vent.
#7
That's what I thought Glenn, a spacer would be needed.
Thanks Chris. I may give that a try. Can't hurt to try, huh? I think I could keep it from leaking if I put the vent elbows on top of the hose as that 2 inch hose isn't going to fill all the way up with diesel. However, your approach is much easier and worth a try.
I still think my vent idea would work, but I'll try this first.
Thanks Chris. I may give that a try. Can't hurt to try, huh? I think I could keep it from leaking if I put the vent elbows on top of the hose as that 2 inch hose isn't going to fill all the way up with diesel. However, your approach is much easier and worth a try.
I still think my vent idea would work, but I'll try this first.
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