Auxiliary tank without 2nd filler neck??? (1 Viewer)

[BigDogg]

I recently noticed what appeared to be a cover plate behind the rear passenger wheel and fuel lines running behind the same side rear folding seat. My 1971 FJ40 only has the stock passenger side filler tube. To my novice eyes, the installation looked rather clean and appeared to have been done a long time ago. I plan to crawl under it next weekend and trace the lines. Did the dealerships install such items? If anyone has any information on this setup, I'd love to hear it.

Regards,

E

 

[charliemeyer007]

No clue. When I first put my 12.5 gallon aux tank behind the rear axle I didn't have the big hose for filling it with gas. I used my electric fuel pump to transfer gas from the front tank to the rear aux tank. Then switched the hoses back. Aux tank was capped off at the fill opening. I did have a hose on the vent and when gas peed out of it the aux tank was full. Was a PIA but way better than 5 gallon cans. Later I scored a hose and cut in a fill opening on the same side as the front tank. I also used small ohm 2% resistors to change the tanks Datsun values to work with my OEM Toyota gauge. A flip of a switch on the dash and the aux tank would read from 1/2 which was full to E which was empty.

Maybe your rig was a smuggler in a former life.

 

[firemanj92]

my 6/70 has it-OEM. I assumed it was emissions related to the vacuum canister. I recall there are soft & hard lines that run along under the pass-rear seat and under the pass floor board it (reddish in your pic) The other (hard lines) travel up the firewall on pass-side in the engine bay across the top of the firewall to the drivers side where 1 line drops just before the master cylinder and connects to underside of air intake and the other travels over mc to the vacuum switch valve on the drivers fender. (It's not another fuel tank though)

 

[JohnnyC]

That’s come up before 100% emissions related … evap tank

 

[JohnnyC]

Here’s the tank on diagram

 

[BigDogg]

Very interesting. It looked as though it was factory installed. Thanks for the responses!

 

[Jdc1]

Very interesting. It looked as though it was factory installed. Thanks for the responses!

Just removed one last week on a ‘71.

 

[mdsims]

I vaguely remember mine in my 71. I always thought it was vacuum system related, not fuel specific. 71s are oddballs with the vac shift tcase.

 

[Living in the Past]

72s had these as well. I've collected a few of the skid plates. Great way to protect the back of the wheel well. Inclose the section to the rear sill would help protect it from rusting. Or hang mudflap off the skid versus at the very back. Would help avoid mud baked on the exhaust end.

 

[peesalot]

Thats a vapor tank, NOT a fuel tank correct ?

 

[firemanj92]

Thats a vapor tank, NOT a fuel tank correct ?

Correct-not a fuel tank