NOTE: 3/26/2020 WE ARE SHUTTING DOWN THIS FORUM IN THE NEXT COUPLE OF WEEKS

Home of all dually trucks with the GMC/Chevy 3500HD series truck a point of interest.

By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please register for an account above!

You can appreciate the “beef” of the GMC/Chevy 3500HD trucks, a stripped rolling 3500HD chassis weighs more than a running C1500!

When posting on this site you won't have to explain what the 3500HD Beast is! ie 19.5 wheels, straight axle, 10 bolt wheels, 15000lbs GVW, 4 Wheel Disc Brakes etc

We are based in the U.S. If you are not from the U.S. or Canada (all IP addresses checked) you will be rejected. If you are a legit overseas applicant, contact me via email: borderdrop@yahoo.com

3500HD.com forum created October 2009 WILL BE SHUTTING DOWN

Author Topic: Dual Tanks. Installing a second tank.  (Read 2005 times)

NORCAL3500HD

  • Single Axle Driver
  • *
  • Posts: 2
Dual Tanks. Installing a second tank.
« on: October 02, 2015, 02:24:24 AM »
1994 3500HD 7.4 Gas with the large factory 33 gallon rear tank. I'm installing a (second) forward mounted 22 gallon factory inside the frame rail tank. How would I tie the second tank into the system to be able to switch tanks? Any help or advice would be appreciated.

RPF207

  • 3500HD Driver
  • ****
  • Posts: 249
  • Age: 31
  • Location: Maine
Re: Dual Tanks. Installing a second tank.
« Reply #1 on: October 02, 2015, 07:11:47 AM »
I've got a 99 with a 6.5 and my two tanks auto feed, no manual switching. Since you have a tbi motor I'm sure you could go snatch a dual tank feed system off a GMT300 R or V3500 (88-91) with a 454 and splice it all in. Then you'd have a good "factory" setup. Haynes sells and great manual for most vehicles and they have great wiring diagrams towards the back, cost about $25. Good luck!
1999 chevy HD 4x4 135.5" 6.5 nv4500 bw4470 Dana 70 HP 10 lug front

Due to recent budget cuts the light at the end of the tunnel has been turned off

KODIAK

  • 3500HD Hero
  • *****
  • Posts: 407
  • Location: Brandon Fl
Re: Dual Tanks. Installing a second tank.
« Reply #2 on: October 02, 2015, 06:29:13 PM »
I seen that in the book also Good find  :)

GM Guy

  • 3500HD Driver
  • ****
  • Posts: 240
  • Age: 29
  • Location: NW. KS to S. ID
  • manual transmission 2wd enthusiast
Re: Dual Tanks. Installing a second tank.
« Reply #3 on: December 20, 2015, 03:30:33 AM »
the factory GMT400 setup involved pumping from the back tank to the front on 96+ dual tank models.

I imagine you could rig it up on a toggle and pump it to the back tank. with the back tank being as big as it is, should be able to let it get to 1/4 or so, and then throw the switch.

I think you could rig up the control module from a 96+, they are not perfect, but work pretty good.

 


LINK SECTION - FEEL FREE TO SUGGEST ANY LINKS (YOURS INCLUDED).



DIESEL HUB
DIESEL PLACE
EAST COAST GEAR SUPPLY
3500HD King Pin Replacement
4BT and Diesel Swaps
King Pin Tech Tip pdf
JEEP ENGINE GUIDE pdf MOPAR
KING PIN THREAD
JEEP WRANGLER WIRING DIAGRAMS
MILLER TIG Welding Calculator
TBI CHIPS.COM
VINTAGE CHEVY/GM FORUM
HYDRO-BOOST LEAKING? Fix it for $6.50