67' to 71' fuel tank question

[nxtruck]

Guys,
I need some help. My son recently bought a 71' C-10 that's in need of a fuel tank. It has the in-cab tank with the two vent hoses that come off of the upper RH corner and go up into the upper part of the cab ( from what I can tell). The tank is very rusty inside and needs to be replaced. My question is this: can I use a tank out of a 67' C-10 to replace it with? I have a friend that has a 67' tank that I could buy pretty cheap, and if it will work, I'd rather go this route.
Any help is appreciated.
Thanks in advance!

[hugger6933]

I think the 71 and 2's had some difference for the smog stuff they started. I would think it could work just fine, those two lines you talked about just loop together at the top.

[nxtruck]

I can definitely do that, if those lines are just emission-related. This truck does still have the charcoil canister and plumbing underhood, as well. I was planning on bypassing all of that, anyway. I was just concerned that those lines may have been vents of some sort.
Thanks for the help!

[GASoline71]

Just make sure you still use the 1967 vented gas cap. The 1971 and 1972's had an EVAP system that had a non vented gas cap.

Gary

[nxtruck]

Originally Posted by GASoline71

Just make sure you still use the 1967 vented gas cap. The 1971 and 1972's had an EVAP system that had a non vented gas cap.

Gary

Yes sir, we'll do. Thanks for the input!

[original condor]

Where is the best place to make sure I actually p/u a 67 to 70 vented cap? On my 70, I need to keep the cap left loose or it builds pressure,(I've felt the air rush out), or maybe suction sometimes? I think it's much harder to detect that as you pull off the cap.
I just know that, one time it started running funny & I reached out the window &
I loosened the cap. There was a whoosh, then the truck ran better. Ive left the cap
loose except when full one time, ever since, which is no good . This is the cap that came on the
truck when I bought it. I just want to make sure I don't get the wrong cap this time
around...... part # would be super great!.............Many thanks.......Steve

[GASoline71]

Any stock factory replacement cap for a 1967 to 1970 should be vented.

Gary

[original condor]

Not too many stock factory 67 to 70 caps around any more are there?

[swamp rat]

My 72 with no smog stuff had a single outlet so yes should work with a vented cap.

[nxtruck]

Thanks for all of the help, guys!

[GASoline71]

Originally Posted by GASoline71

Any stock factory replacement cap for a 1967 to 1970 should be vented.

Gary

Originally Posted by original condor

Not too many stock factory 67 to 70 caps around any more are there?

"factory replacement" = aftermarket

Gary