Fuel tank dilemma

[challenger7070]

Hi all, I'm after some advice on using a non-emissions fuel tank on an N95 California car. There's a reason...

I didn't realise there were two types of fuel tanks and the car was being exported for overseas so had a new tank added to the consignment. During restoration and finding a few pinholes in the original tank, realising there was a difference, I wonder if there is a drawback to using the non-emissions tank.

It would take months to get a new one and cost of overseas shipping plus taxes, so ideally if I can run this tank for a year or two, and eventually order a new one, at least it gets the car up and running and I can swap later down the line.

I have a vented fuel cap, so there shouldn't be any issue in regards to tank pressure with that cap (but feel free to correct me). I can plug off the line that runs from the tank up to the multi-connection PCV breather.

Would the worst case scenario with this setup be that there may a slight gas fume smell when the cap vent is letting pressure out?

Thanks!

[MEK-Dangerous]

Welcome aboard here!

 I will confess to drilling a small hole in a non-vented gas cap once upon a time. There were never any fuel smells.

You plan sounds good to me. 

[Brads70]

Either will work, vent is either routed up to front in valve cover nipple going to breather or charcoal canister ( depending on year) or for 1970 vent hose was simply routed into rear frame rail. There are different gas caps depending on years.

[challenger7070]

Thanks for the warm welcome!
Thanks for the straightforward answer MEK-Dangerous, I guess sometimes it's easy to overthink things.

When I looked at the yellow service manual (the big 888 page one), it showed the non-cali version as Brads70 describes (routed into rear frame rail) though I couldn't tell if that came with vented or non-vented gas cap. It shows that there is a vapour take off tube in the filler tube, way up near the gas cap. Which the N95 doesn't have. I pondered the option to drill a small hole in the filler tube and thread in a small bung to create a breather tube and route it to the N95 line that runs all the way u to the valve cover nipple, in a way creating a hybrid of both systems.

But if the only reason for that is to move the fumes into the valve cover, then I'm ok with it venting to atmosphere (for the time being anyway). The car is quite original so I'd like to avoid drilling the filler neck, as silly as that may sound. And with fuel being a dilutant to oil, maybe it's best to keep the fuel fumes out of the crankcase as much as possible.

[7212Mopar]

Normally no chance for gas vapor to condense and become a problem for the engine oil. Drilling a small hole at the gas cap will take care of the gas tank pressure build up problem. No smell from tank but you smell gas from engine bay after shutdown.

[moonshine_mike]

I have a couple E bodies in the garage here in boiling AZ. Both have vented gas caps and frame rail tube. Driven regularly and I really never smell any gasoline inside or out, before or after the run. My spouse just happens to be  the "authority smell tester" and has never complained about a gasoline odor. Exhaust fumes that lingering for hours after an "in garage" test is another story completely. I have stood trial and been punished for that many times. Differential oil odor as well results in penalty box for me. No big worry on the gasoline odor front.

[B5fourspeed]

I have a 70 440 Cuda.I have a vented gas cap and the frame rail vent tube.This is the second Cuda I have restored using this vent system and I have had zero issues.No gas smell what so ever.

[challenger7070]

Thanks - it doesn't have the frame rail vent that comes from fuel filler neck, so I'd be solely relying on the vented gas cap to manage the pressure in the tank, which is why I'm a little hesitant.

[MEK-Dangerous]

Thanks - it doesn't have the frame rail vent that comes from fuel filler neck, so I'd be solely relying on the vented gas cap to manage the pressure in the tank, which is why I'm a little hesitant.

Do it!
Go with the vented fuel cap. You won't have any problems.