Who ever thought that a cap less filler like this is going work needs to get into the real world, I always fill off Auxiliary Tanks (Fillrite Pump) But I have been filling $10/20 at a time to test the cap 50/50 2 times its work, 2 times spray & 1 pump kept shutting down . The gate spring is strong... ... . so you need to force the nozzle into the neck, that's 1 problem the other is some pumps have higher flow no matter how well you stick the nozzle into the neck it just shuts down, even at the slower setting. O I can see it now crap in your fuel system warranty denied. I will measure the size and order a cap from Stock cap on My next order from them, until Ram comes up with a fix, a couple of hundred of complaints at the NHTSA should do it.
What interesting at some pumps it won't shut down when spraying, How many wimps are going to hit the master shutdown at the islands? That's going too really please a few station owners!!!!!!!!!!