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

Product ID: 463905300

Details

Brand
TARSONS WITH
Colour
Yellow
Item length
60 Inches
Item weight
0.08 Kilograms
Manufacturer
Saint-Gobain
Material
Polyvinyl

📏Precise 1/4" ID x 3/8" OD

🟡Translucent yellow for easy flow check

🛢️Resists fuel & lubricant swelling

$77.72

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Fuel your engine with confidence — the tubing pros trust!

VISUAL FLOW ASSURANCE - Translucent yellow tubing lets you monitor fuel and lubricant flow at a glance, preventing costly downtime.
EFFORTLESS INSTALLATION - Ultra-flexible design simplifies routing even in the tightest engine compartments.
PERFECT FIT EVERY TIME - Exact 1/4" inner diameter and 3/8" outer diameter ensures seamless compatibility with small engine fuel systems.
LONG LASTING PERFORMANCE - Minimal extractability protects fuel purity and extends tubing lifespan, keeping your engine running clean.
ENGINEERED FOR RELIABILITY - Premium Saint-Gobain PVC tubing resists cracking and leakage under hydrocarbon exposure.

The OEM Tygon F-4040-A Premium Fuel Line is a 5-foot, 1/4" ID x 3/8" OD translucent yellow PVC tubing designed by Saint-Gobain. It offers exceptional resistance to swelling and hardening from hydrocarbon fuels and lubricants, ensuring durability and leak prevention. Its flexibility and clear color make installation and flow monitoring effortless, making it ideal for small engine fuel and lubricant systems.

Specifications

ASIN	B07H3ZL5QY
Best Sellers Rank	355,389 in Automotive ( See Top 100 in Automotive ) 170 in Automotive Fuel Injection Oil Supply Lines
Brand	TARSONS WITH THE WORDS TRUST DELIVERED
Colour	Yellow
Customer Reviews	4.7 4.7 out of 5 stars (390)
Item Dimensions L x W	152.4L x 1W centimetres
Item Length	60 Inches
Item Weight	0.08 Kilograms
Manufacturer	Saint-Gobain
Material	Polyvinyl Chloride (PVC)
Nominal Wall Thickness	0.25 inch
Outside Diameter	0.38 Inches
UPC	670628180929 769079144380
Unit Count	1.0 count

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