Isuzu npr 4wd

SkiFreak

Crazy Person
Normally, if you fabricate something from scratch you get exactly what you want.
Modifying an existing product can be beneficial sometimes, but more often than not, it will take longer and it may end up being a compromise for what you actually want.

Determining which is the best way to go is the challenge.
If you make the wrong choice, ultimately it will cost more time and money. Ask me how I know...
 

gator70

Active member
A bit of surprise for me - I found this in my system

(nothing I ordered, must have been standard in the build - wired from the battery to the front of the habitat)

How should I be using this?

1743559924932.png
 
Last edited:

gator70

Active member
Trying to get this tank installation correct. Can anyone comment??

+++++

✅
Can I Route the Fuel Line from the Transfer Pump into the Main Tank’s Fill Neck?​

Yes — with a transfer pump setup, it's common and safe to route the fuel line from the auxiliary tank’s pump into the main tank’s fill neck using a fill neck adapter.


🔧
How It Works​

  • Fuel flows from the auxiliary tank through the transfer pump.
  • The pump pushes fuel into a fill neck adapter installed on the main tank’s fill tube.
  • The fuel then enters the main tank just as if you were filling it with a gas station nozzle.

📋
What You’ll Need​

  1. Transfer Pump
    • Mounted to the auxiliary tank or inline
    • 12V powered, typically wired to a cab switch
  2. Fuel Hose (fuel-rated)
    • Connect from the pump outlet to the fill neck adapter
  3. Fill Neck Adapter
    • Installs between the fuel cap and the fill tube
    • Designed for pump-fed auxiliary systems
  4. Clamps & Fittings
    • All connections should be secure and leak-free

🛠️
Installation Summary​

  1. Mount the transfer pump on the auxiliary tank outlet.
  2. Run the fuel hose from the pump outlet to the fill neck adapter.
  3. Install the fill neck adapter on the main tank’s fill tube.
  4. Wire the pump to a toggle switch or timer in the cab.
  5. Secure all fittings, check for leaks, and test the system.

⚠️
Important Notes​

  • Never run the transfer pump unattended. Only activate it when the vehicle is consuming fuel to avoid overfilling.
  • Use a check valve if needed to prevent backflow or fumes from entering the auxiliary tank.

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Example
1744813591077.png
 

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