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https://hpsperformanceproducts.com/ Not the cheapest thing, but I intended to never have to deal with it again Silicone is fine for vacuum lines and coolant lines (reinforced in the latter case for the pressures) but also worth noting can be more difficult to seal at the ends (hence I use coolant-exposure-rated RTV for added insurance). It's true different kinds of rubber - of which at this point there's so many I've lost track - are good for different kinds of things and will fail if mis-applied. Here's my cheat sheet: For fuel hoses, I replaced everything with Gates Barricade except for the submerged hose in the tank/pump which was some super special snowflake stuff (fuel submersible rated) - and wildly expensive. Crankcase ventilation/PCV - Gates PCV/EEC Vacuum/Coolant - (reinforced) silicone as noted

Look for a manual car wash, the kind that eats quarters and gives you time with the spray wand. Don't shoot it directly at electrical connectors or fluid caps if you can avoid it, otherwise give 'er hell. I'd spray it down before you get in there. It's much nicer working on something that isn't an oily mess.

Well (expletive.) Thank you for the info. I have been turning wrenches for maaaany years and my brain did not put those two together. Totally makes sense. Thank you for knocking the cobwebs off of this old head. Checking out HPS now.... WOW. How have I not found this before. Thank you dudes!!! I owe you both a FEW beers....

Alright, got it through emissions and re-registered! Only 8 months late... Last night I installed a non-fouler on the downstream driver's O2 sensor and it seemed to do the trick. Not only did the P0430 not move to stored to screw up my day, but it's also no longer in pending. Steering was a little more squirrelly today. I need to get to the bottom of that. But otherwise, the truck is operational. Hoping to do a shakedown run soon.

I'll bet the fuel hose is the problem. There are different kinds of rubber used depending on what kind of fluid they're up against. I've heard of (and seen!) rubber meant for cooling systems swell and get squishy when exposed to oil. Looks like fuel line and coolant don't like each other, either. Looks like HPS makes silicone hoses. If you can't get a standard hose at a decent price (or want fancy candy-colored ones), that could be a good way to go.