Is this fuel hose submersible? Can it withstand laying inside the gas tank?

Yes. It will not swell like rubber hose. I have it submerged in a Farris zero turn. No problems so far.

Genuine tygon tubing is branded all along the length, can anyone tell me what the tubing says?

"SAINT-GOBAIN Tygon (R) F-4040-A" is inkjet printed in white every foot or so on the yellow tubing.

will this connect to an 5/16 npt thread?

No the 1/4 ID hose will not fit over 5/16 pipe. You will need to go to ACE and in the brass plumbing section get adapter and 1/4 hose barb

I'm guessing you need a 9mm i.d. clamp? or 8mm clamp?because you'd want to squeeze it to something just under 3/8"?

I used a 1/4” worm drive clamp with no issues

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Tygon OEM F-4040-A Premium Cut Length Fuel Line 1/4" ID X 3/8" OD X 5' Feet

Product ID: 405363730

Details

Brand
Tygon
Colour
yellow
Item weight
0.08 Kilograms
Material
Polyvinyl
Nominal wall thickness
0.125 inches

📏Precise 1/4" ID x 3/8" OD sizing

🌡️Wide -35°F to 165°F temp range

🛢️Fuel-grade Tygon F-4040-A tubing

Description

🛠️ Upgrade your fuel line game with the trusted flexibility of Tygon!

FLEXIBLE YET DURABLE - Soft 57A durometer rating ensures easy routing without kinks or leaks, outperforming brittle alternatives.
PRECISION CUT LENGTH - 5-foot pre-cut length with exact 1/4" ID and 3/8" OD for seamless fit and installation.
VISUAL FLOW MONITORING - Translucent yellow design allows quick identification and easy inspection of fluid flow.
ENGINEERED FOR PERFORMANCE - Premium Saint-Gobain Tygon tubing resists swelling, hardening, and embrittlement from fuels and lubricants.
VERSATILE FUEL COMPATIBILITY - Safe for gasoline, kerosene, heating oils, glycol coolants, and more — perfect for engine and garden hose applications.

The Tygon OEM F-4040-A Premium Cut Length Fuel Line is a 5-foot, 1/4" ID by 3/8" OD translucent yellow tubing made from Saint-Gobain's high-grade PVC formulation. Designed specifically for fuel and lubricant transfer, it offers exceptional resistance to chemical degradation, a broad temperature tolerance from -35°F to 165°F, and superior flexibility with a 57A hardness rating. Ideal for professional-grade engine maintenance and fluid system upgrades, this tubing ensures reliable, leak-free performance and easy visual flow monitoring.

Specifications

ASIN	B07H3ZL5QY
ASIN	B07H3ZL5QY
Best Sellers Rank	#107,427 in Automotive ( See Top 100 in Automotive ) #21 in Car Engine Lines
Brand Name	Tygon
Color	yellow
Customer Reviews	4.6 4.6 out of 5 stars (300)
Customer reviews	4.6 4.6 out of 5 stars (300)
Date First Available	14 November 2017
Is Discontinued By Manufacturer	No
Item Length	5 Feet
Item Weight	0.08 Kilograms
Item model number	Tygon
Manufacturer	Saint-Gobain
Manufacturer	Saint-Gobain
Material Type	Polyvinyl Chloride (PVC)
Nominal Wall Thickness	0.125 inches
Outside Diameter	0.38 Inches
Product Dimensions	12.7 x 0.97 x 0.97 cm; 82 g
UPC	670628180929 769079144380
Unit Count	1.0 Count

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