CONTINUOUSWAVE

On my [2016 MONTAUK of unspecified model] I want to replace the fuel lines. I have found two suitable rubber hoses:

• Trident Barrier Lined A1-15 Fuel Hose
• Shields A1-15 Series 368

Give advice [on which of those two brands to use or suggest other brands]

I also plan to replace the fuel demand valve on the Moelller on-deck fuel tank.

A rubber fuel hose rated A1 will be completely suitable. The hose diameter should be chosen to match the engine requirement. Usually 3/8-inch ID hose is good for up to 300-HP.

I recently bought some new rubber fuel hose rated A1. I was shocked at the price--so shocked that I can't remember the exact cost, just that it was shocking, and seemed like it was $7 per foot. I was glad I only needed three feet.

What prices have you found for A1 rubber hose?

Both Trident and Shields are high-quaility brands.

Either brand is a solid choice.

https://www.fisheriessupply.com/trident-marine-series-365-barrier-a1-marine-fuel-hose

JimH - I see $9.29 per foot for the Shields at West Marine, or 50-feet $140 at Walmart.

Thanks Phil- Appreciate the confirmation

What is the OD of 3/8 inch ID fuel hose? I've seen conflicting sizes advertised.

Butch--[The outside diameter of 3/8-inch-ID rubber hose] varies. You base your selection on the ID.


STOP EDITING MY POSTS

In some older Boston Whaler boats I have observed that metallic fuel line was used to bring the fuel from the below-deck fuel tank up above-deck level. I assume that Nickel-Copper tubing was used. I also assume that flare-fittings were used. This practice seems to have been abandoned in favor of all-rubber fuel lines. That probably is a result of easier installation and routing of flexible rubber hoses instead of having to carefully bend metallic lines to a particular shape.

In regard to permeation of the fuel line--a subject of recent EPA concern--a metallic fuel line would be very compliant.

In the newer rubber fuel hoses their rating is specified as A1-15. The dash-15 nomenclature indicates the material complies with a maximum vapor permeation limit of 15 grams per square meter in a 24-hour period. The previous limit was for maximum vapor permeation of 100 grams per 24 hour period.

The federal regulations about permeation of fuel lines are given at 40 CFR 1060.12:

https://www.law.cornell.edu/cfr/text/40/1060.102

A very comprehensive document about fuel system is

United States Coast Guard and Environmental Protection Agency
Compliance Guideline--How to Comply with the Law
Fuel and Emissions
https://www.uscgboating.org/assets/1/AssetManager/ABYC.1002.01.pdf

jimh wrote:In some older Boston Whaler boats I have observed that metallic fuel line was used to bring the fuel from the below-deck fuel tank up above-deck level. I assume that Nickel-Copper tubing was used. I also assume that flare-fittings were used. This practice seems to have been abandoned in favor of all-rubber fuel lines.

Metallic fuel line sounds like a recipe for disaster on a boat with gasoline. Material fatigue due to vibrations, pounding, and corrosion would concern me on a gasoline engine. I have seen copper fuel lines used on diesel engines. The lines had lots of restraints so they could not flex or vibrate. This was for runs along hull stringers. The fuel line was converted back to a rubber line on the tank and engine side connections to allow freedom to flex as needed (or required).

Only $37 on sale for 10'

https://www.amazon.com/gp/product/B0002 ... UTF8&psc=1

Not sure if the Sierra hose is one of the ones to avoid.

Not 100% certain on automotive. I look for "marine"

It appears to have a "liner". This maybe like the gray hose where the liner degrades and gets ingested.

I just ordered some to try out, reviews looked overall positive (aside from getting slightly less than 10') If you read product description below it says for marine.

"Product Description:
Shields low permeation Marine fuel hose has a plastic barrier veneer with an NBR outer layer tube to prevent permeation. This polyester reinforced Hose Complies with EPA and CARB very low permeation requirements and is weather/UV resistant. This Hose is primarily used for fuel feed (gasoline up to 85% ethanol blended fuels/diesel/all bio-diesel blends). it meets USCG type A1 - 15 requirements for pleasure boats and meets sae J1527 type A1-15, ISO 7840 type A1, and NMMA/CE type accepted standards. The temperature ranges from -20 DegreeF to 212 DegreeF."

"Meets USCG type a1-15 Requirements for pleasure boats. Meets Saej1527 type a1-15 ISO 7840 type A1 and NMMA/CE type accepted standards"

Thanks gentlemen. I very much appreciate the responses.

FYI - I replaced only the hose between tank and the Fuel demand valve and the replaced Fuel demand valve. Seems to have help greatly. Cut open old piece of fuel line and it seemed like the interior lining was coming loose. probably shrinking in under pressure.

Not familiar with the fuel demand valve installation. Can you upload a photo of this.

To my knowledge this must have been installed by a dealer as it is not OEM.

Is this a replacement for the primer bulb?

The lining was not alcohol resistant and fails over time. This liner is typically found in grey colored fuel hose that is not alcohol resistant.