fuel tank

[DennisJ]

I am trying to put a second tank in the bed, to be used as the primary tank with an air dog suppling fuel to the motor from the in bed tank. I want to wire the air dog to factory harness and put a toggle switch on the existing factory fuel pump to transfer fuel to the tank in the bed, should be about 100 gallons total. My question is do i need a check valve in the line from factory pump to the tank in the bed? If so where do i get one that will hold up to ulsd???



Thanks for the helpOo.

 

[JVantreese]

I can see the logic to combine the fuel to a common tank, but why do you want to pump fuel uphill to the aux tank? I added an 80 gal aux tank and used the gravity system available from Northern Tools. This system uses a tap into the main fuel rubber fill hose. It has a check valve in it that limits fuel intake so that it keeps the OEM tank full but will not overfill it. There is a shut off on the aux tank so I can disable the auto fill to the OEM tank if I choose. I put a locking fuel door on the truck and keep it locked. My aux tank has a fill cap next to the driver side of the truck and is level with the bed rail. My capper has flip up side windows so all I need to do is open the window and fuel the aux tank. This setup allows the OEM fuel gauge to sit on F until the aux tank is empty and then I know I have about 35 gal left before I need to fuel again. I also reset my overhead trip odometor when I do fill. When I get to about 1000 to 1200 miles, I start looking for a good price. This set up gives you the advantage of being able to use the OEM fuel gauge, using the OEM LP or doing a "normal" install of an aftermarket pump. I can remove the entire system with only the cost of fill hose, no additional pumps or wires or switches to go bad.



Some might be concerned of the legality of a gravity system but I do not do any commercial use and as far as I know their is no problem with personal use of this system. If you are the kind of guy that wares both a belt and suspenders, you can shut the aux system off untill you need a fill and then turn it on for an hour or so. Think of it as an 80 gal fuel can that you don't have to lift. The aux tank has a rollover check valve for the fill and I added one to the vent hose. I have left my aux tank turned on for about a year and have had no problems.



Good luck with whatever you decide. You will appreciate the additonal range and choices as to when and where you fuel.

 

[RDusch]

I also use the Northern gravity feed kit, and has work perfectly, i also installed a 10 micron filter between both tanks to help keep any crap from getting into the main tank.

Rick

 

[jelag]

All my trucks run extra tanks in the bed... . We install a 120 gal tank and we run a line out the front of the tank through the plastic gromet in the bed... . down to a small back check, through an electric fuel pump, 10 micron filter into the neck of the stock tank..... the back check is rated at 1/2 lb and this keeps the system from gravity flowing..... we have a small switch mounted next to the brake controller and when the stock tank is low we start the flow of fuel.

This has worked well for us and we haven't shortchanged the integrity of the stock fuel system... .

 

[DennisJ]

Where do i find this back check i think that is what i am looking for



thanks

 

[steved]

My question is do i need a check valve in the line from factory pump to the tank in the bed? If so where do i get one that will hold up to ulsd???

Since the factory intank pump will pass fuel, you would need a checkvalve to keep it from siphoning back into the main tank... the fuel bowl-mounted pump doesn't pass fuel when it's shut off, so it might not need the check valve, but I would install one anyway...



I bought both of my check valves from eBay... 1/8" NPT and 2 PSI cracking pressure. You want to make sure you have a very low cracking pressure or the pump won't even be able to open the checkvalve (or prime itself for that matter). As for the checkvalve holding up to ULSD... mine is simply a plactic ball held in place by a stainless steel spring, in a steel body... not really suseptable to ULSD.



steved

 

[jelag]

Any industrial hose supplier should have an assortment of back check valves in stock... .