Fuel leak on hard left turns

[Tonker1]

Hey,

I've been doing some fairly hard driving lately around twisting mountain roads, when I take a hard sustained left, fuel pushes to the right of tank runs up the filler neck and either goes down the inside of the body work on the filler neck to RR fender panel or down the outside of the fender.

Obviously I need to replace the gaskets on the filler neck connection, but I feel like the fuel shouldn't be bashing up against the filler cap on hard left turns.

Any ideas on what is causing this?

Cheers in advance!

[brads70]

Other than the filler neck grommet? Maybe try a non vented gas cap? 

[Tonker1]

Fair enough! I'll cut a thicker gasket out of foam, see what I can manage. I'll keep thinking about what to do with the cap. Maybe weld some baffles into the filler neck to reduce fuel flow speed on those hard lefts.

[dodj]

My filler tube does have a baffle of sorts at the bottom. It sticks out the bottom of the tube.

[1 Wild R/T]

I haven't seen that much on Challengers but it's pretty common on other vintage cars.... A quick & easy fix is to add a unleaded fuel type restrictor with the flap...

http://www.pciinc.com/index.php/gas/fill/pipe/restrictors/

[74 challenge]

I had a flip top filler with the same leaking fuel deal so I bought a non vented gas cap to put on underneath the flip top. Been years of easy driving but I can't say I thrash mine around too much.

[dfrazz]

How much fuel are you putting in?  Any time you overfill or fill up your tank and then do hard driving you run the risk of overflow.

[1 Wild R/T]

I had a flip top filler with the same leaking fuel deal so I bought a non vented gas cap to put on underneath the flip top. Been years of easy driving but I can't say I thrash mine around too much.

The Challenger flip top is decorative, it was never intended to keep the fuel in....  68-70 Charger, 67-69 Cuda & 67 GTX flip tops seal the filler....

[dodj]

I had a flip top filler with the same leaking fuel deal so I bought a non vented gas cap to put on underneath the flip top. Been years of easy driving but I can't say I thrash mine around too much.

Are you saying you have been driving around without a cap under the flip-top?

[Tonker1]

I have the screw top gas cap! Is it vented?

The rubber restrictor looks promising!

I haven't seen that much on Challengers but it's pretty common on other vintage cars.... A quick & easy fix is to add a unleaded fuel type restrictor with the flap...

http://www.pciinc.com/index.php/gas/fill/pipe/restrictors/

I fill it up reasonably well, the loop I was on was about 3hours of driving, I don't want to be that guy on the side of the road begging for gas!

[1 Wild R/T]

I have the screw top gas cap! Is it vented?

The rubber restrictor looks promising!

Thats not rubber, it's steel.... You install it with a large socket & a hammer... The jagged points lock into filler tube...

[Tonker1]

Thats not rubber, it's steel.... You install it with a large socket & a hammer... The jagged points lock into filler tube...

Would that not interfere with the screw cap attaching clips that are inside the top of the neck?

[1 Wild R/T]

it winds up a few inches below the cap area...    Guys use them on old Fords & old Chevys so I would assume it'll install on a Mopar the same way....