Originally Posted by EDABEUT
If you go to a junk yard and get a fuel module out of a fuel tank you can remove the vapor line vent valve or so called rollover valve and put on the end of the vent hose. It will prevent fuel escaping but still let it vent properly. Any newer vehicle with in tank fuel pump must have rollover protection from fuel escaping the tank thru the vent to the vapor canister. I was a GM fuel system designer for 20 years.
If you don't mind me asking how much did you have into you aux tank ????
My tank does have a roll-over protection vent valve. It is the same vent that once enough pressure is built up it vents through. Occasionally some fuel will come out with it. Very little, but still some. I noticed it more when I used it for Gas, but since I converted it to diesel I have a longer vent hose that goes further up which might better prevent the leaking of fuel.
In any case, it has been a few years since I purchased it, but I want to say all in with tank and pump (GPI from Tractor Supply) I have around $1200 in it give or take. Again, this is a custom tank made to fit below the bed rail AND most importantly, legal to use with Gasoline or diesel.
There are others that are much cheaper. ATI doesn't sell direct, but I dealt directly with the company through one of their vendors. That is, I told ATI what I wanted, they sent it to a vendor to write up an order and then process the order. (www.atitank.com
Edit: To add about the pump - mine is wired to connect to a 7-Pin trailer plug. I have a plug in my bed for a F/W, or I can plug in at the bumper. I have also fitted my aux air pump to run the same way. (They actually have power-pole connectors on them so I can connect via a 7 pin adapter or a set or battery style jumper cables. I love the flexibility.)