Can this be used to repair a hairline crack on a plastic stem for a quick connect fuel line?

Michael, I really don't know, but I doubt it. This is not a hardening substance like JB weld. It stays flexible so that parts can be taken back apart again if needed. I would think that just covering the crack in your quick connect line would not be effective. I have only used this product one time so I'm not the voice of experience. My application was to seal between a motorcycle fuel tank and the gasket of the petcock and around the hold down bolts. So far no leaks. However, mechanically for your issue, this does not seem like the proper application as it would not fortify the crack. For the cost of this tube you could source another quick connect. Hope that helps

will this work as a gasket for a carb bowl gasket?

I would not recommend it, or any other liquid gasket material on any carb connections.

Will this seal the bolts in my triumph speed triples gas tank.?

Used it on the threads for my pressure regulator fittings and my fuel pump fittings so far no leaks

Will this work in combination with a fuel pump gasket ?

I used it to seal a plastic spout to a mounting ring for a 5 gallon gas can. The spout came from another gas can and I cut it to size. Unfortunately it wouldn't seal, until I added a bead between the two components. I let it dry for about a week when it hardened. It's worked for at least 2 years without any leaks. Good stuff!

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🛠️ Seal like a pro, perform like a boss!

FUEL PROOF FORMULA - Engineered to resist gasoline and all automotive fluids, ensuring long-lasting seals.
ENDLESS ASSEMBLY TIME - Tacky, vibration-resistant formula lets you work at your own pace without drying out.
REBUILD READY SEALANT - Designed for repeated metal-to-metal disassembly and reassembly without losing integrity.
VERSATILE APPLICATION - Ideal for cars, trucks, boats, lawn mowers, and more—your go-to gasket dressing.
UNMATCHED HEAT RESILIENCE - Stays flexible from -60°F to 500°F, perfect for extreme engine conditions.

Permatex 85420 Permashield is a high-performance urethane gasket dressing and sealant that resists gasoline and automotive fluids, remains flexible across extreme temperatures (-60°F to 500°F), and supports repeated disassembly in metal-to-metal applications. Its vibration-resistant, tacky formula offers unlimited assembly time, making it the trusted choice for professionals and enthusiasts across automotive, marine, and outdoor equipment.

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Material	Urethane
Brand	Permatex
Style	Classic
Item Weight	2.88 ounces
Water Resistance Level	Waterproof
Item Form	Paste
UPC	686226854209
Unit Count	1.0 Count
Global Trade Identification Number	00686226854209
Number of Items	1
Color	Orange
Surface Recommendation	Pipe
Manufacturer	Permatex
Model	85420
Item model number	85420
Is Discontinued By Manufacturer	No
Manufacturer Part Number	85420
OEM Part Number	85420

Permatex85420 Permashield Fuel Resistant Gasket Dressing & Sealant, 2 oz Tube, Orange

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