IN BED TANK

[MIKE WIENER]

I have a in the bed tank from a former truck. Would like to use it on my 01 3500 duramax. Am afrade of using A switch valve. On the gas truck if you forget to switch not that big of prob. But if i forget on the diesel. I do not even want to think of that. Have talked to transfer flow nice setup but they will not sell just the instalation hardware. Any one know of a alternitv set up. Thanks for any help :(

[BigLakeDMAX]

Hi Mike, welcome!

I'm nearing the final stage of installing an in-bed fuel and tool box from Northern Tool. I researched the Chassis Cab OEM dual tank setup which transfers fuel from the aux tank to the main tank as the main tank uses fuel. Most of the wiring for this setup, including the fuel transfer pump relay, was included with my 2500HD and I would imagine is with yours, too. I've tested the circuits and find them working. The last thing I have to do is connect the aux tank sending unit to the ECM to insure the system works as it should (basically, the ECM reads both sending units and displays total fuel on board in both tanks combined. It then activates the transfer pump to move fuel from the aux tank to the main tank as needed to equalize them).

I hope to have this done in a week or so. I'm taking photos and notes as I go and will post the procedure and part numbers if it works.

An option to this system, that many people have done, is to wire the transfer pump to a switch in the cab which you activate as needed to pump fuel to your main tank. Several folks have added in a timer circuit so they don't forget the pump on an spill fuel on the road. If you search for auxiliary fuel tank, you should find alot of info.


Don

[Idle_Chatter]

Mike, contact American Tank at www.auxtank.com (http://www.auxtank.com) and see if they can help you out. I have one of their aux tanks in my bed and have been using it successfully for over 2 years now. The six-way valve works like a charm. I flip one toggle switch in the cab and the valve switches supply to the selected tank, switches return fuel to the selected tank (through the OEM fuel cooler), AND switches the OEM fuel gauge to the selected tank sender. Can't get any simpler than that!

[MIKE WIENER]

DON

Sounds like you got a hole lot farther on your research than I did. I had the same thought of the chassis cab setup. evry one I taked to did not what to help becuse of liabelety for emisions.

Are you using the factory aux transfer pump? is the sending unit part of the pump. is the pump in the tank or is it external?

If the factory wiring will not work I think I will go with the swithch and timer. I had not thought of a timer. I kept thinking if you forgot to turn the pump off. you know side tracked in conversation or that driver that keeps playing lane chekers.

my tank is also a northern tool tank the wedge modle.

thanks for the help keep us posted.

Mike

[MAV]

Mine is just a gravity feed.
http://pic8.picturetrail.com/VOL227/437876/777914/34406724.jpg
Here is my valve for transfering fuel.
Pic was taken before I had my Line-X sprayed.
http://pic8.picturetrail.com/VOL227/437876/777914/25620696.jpg

[hd90rider]

Mike , check out this part # at Advance Auto: AC Delco # U7000 price was $78.29. 6 way electric fuel solenoid switch.

Mav, Gravity feed is OK as long as you dont forget to shut it off. Also is totally illegal if used in a commercial vehicle.

[Flyboy]

My setup is like Mav's. I have left the valve on many times and never have I had it overflow.

[MIKE WIENER]

After reading the other post about chasecab fuil gage problums. I am dot so shure the retro stock set up that me and BiglakeDmax talked about is such a good one. if there is a prob. I am sure the deler is not going to help reset the gage.
I have found a company in Canada called Tour buddy. They us a gravity feed setup. To stop the flow when the fuel reaches a taped in vent it stops. The only thing is if the cap loses it seal or a burp in the line.

Mav or Flyboy in your setup is the aux tank sealed. As in nonfented cap or other vents.

Mav in your pic what is the clear tub.

thanks mike

[MIKE WIENER]

Sorry that's nonvented not nonfented

MIKE

[Flyboy]

My aux tank has a vented cap. I have a vent line connecting both tanks together.
Gerald

[MIKE WIENER]

Got under the truck today to tap the factory T into the vent on the filler. Do not have one the filler hose and the vent ar all one unit one inside the other. I am like lost both the book and the dealer computer show a seperated vent and filler. I am lost at were or how to tap the line from the aux tank. any one have a solution? once agin I am working on a 2001 D/A 3500 crewcab pickup.

[MAV]

Mike, my tank is sealed except for a vented fuel cap that vents at 15-20 lbs of pressure. The clear tube is my sight window so I can see how much fuel is in the tank. I have 5 gal marks on the side of the tank. When my light comes on in the dash, I dump 20 gals. My tank holds 60.

[MIKE WIENER]

I competed a modafid verson of what transfer flow has. I used a pump from a chase cabe. monted it under the truck. made a section of pipe with two fitings in it. Then cut a section out of the outer fill hose. taped the pump feed in the upper fiting & the return line in the lower one.

wired the pump with a panles relay kit to a swith on the dash that is only hot with ignition on. Wiered the gage to the a ignition hot also.

Filled tank in bed. system works great. Did have to ad one thing. When shut off a sifon was created added a anti sifen fiting i found at west marin. Tested at home let run after main was full no problums. NO over flow out filler.

First trip out i let the main tank get about half flip switch and i about 15 min tank was full agin. It was nice to pas by those stastions with the you have to be kiding price.

MIKE

[BigLakeDMAX]

Just an update for anyone who is following this thread - I emailed Mike last week: I was not able to get the transfer system to work using the chassis cab system. While most everything is there on my 2500HD, there must be a difference in the ECM programming that will not read the aux tank sending unit. This causes the gauge to read only the OEM tank and therefore, will not activate the transfer pump. So, I plumbed the system using a Pollak fuel selector valve allows me to switch between tanks. The dash gauge reads whichever tank is selected.

One thing of note: Even with the reduction in the size of the supply line from the 1/2" OEM steel line to the 3/8" supply ports on the valve, I still experienced a reduction in vacuum in the fuel system from 3.5" Hg to 2.5" Hg when drawing from the OEM tank and to 1.5" Hg when the aux tank is selected. Seems gravity is helping with the movement of fuel from the higher tank in the box. I also cut my OEM fuel line before the two nearly 90 degree bends in the OEM supply line just ahead of the fuel cooler which I'm sure resulted in the reduced restriction measured.

Don