Fuel Cell Venting Question

[1971ChevyTruck]

My dad has a Jazz fuel cell mounted behind the rear axle. It has an self venting cap on the top. He is about ready to do a rear marker light gas filler and I noticed the S-10 fuel filler has a vent pipe. Does he need to use that since the tank is already vented?

[Hart_Rod]

If he's using the rear filler, then I'm assuming he won't be using the vented cap anymore, soooooo, yes you will need to use the vent. Of course, this all assumes I understand your question, .

[1971ChevyTruck]

Thanks, but here is the cap that I am refering to and not a locking cap. I should have posted a pic, sorry

[Hart_Rod]

No worries, . I would still get a brass fitting and install in the same location and run it over to vent on the S-10 fuel filler that you are going to use. That way, if it ever overflows through the vent, it will go back in the filler back to the tank....