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Yacht and Marine Parts Professional
Support:

Technical support and after-sale service are of great important for Genuine Marine and we believe these two are far more important than those products we are selling. Genuine Marine sales and technical team are ready to help our customers with any technical questions in relating to boatbuilding, equipment selection and installation; We are also willing to offer free product introduction and technical training for free in your factory.

Feel free to contact us via phone and email. The following are those technical questions we solved for our customers and feel free to visit periodically and learn together!

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So what is the difference between A1, A2, B1, and B2? First the difference between A and B. A type hose has to pass the 2 ½ minute fire test, B does not. The theory is the A is under more pressure than B, and being on the engine is exposed to more danger of fire than B. Since B is between the pump and the tank, if a leak occurs,the pressure rapidly drops to zero and the pump just sucks air, stopping the engine. Fuel doesn't get sprayed all over the place. With Type A, since it is between the fuel pump and the carburetor, it is under pressure and there is the potential that fuel will be sprayed around.


The difference between Type 1 and 2 is the permeability. All hose allows a small amount of vapor to pass out through the wall of the hose. The more permeable the hose is, the more vapor passes through. A1 and B1 pass much less than A2 and B2. About 1/3 as much. The Coast Guard Sets the standard for the amount that is allowed.
FEDERAL LAW 183.540 - Hoses: Standards and markings。

(a) "USCG Type A1" hose means hose that meets the performance requirements of:
(1) SAE Standard J1527 DEC85, Class 1 and the fire test in Sec.183.590; or
(2) Underwriters’ Laboratories, Inc. (UL) Standard 1114.



 

(b) "USCG Type A2" hose means hose that meets the performance requirements of SAE Standard J1527 DEC85, Class 2 and the fire test in Sec 183.590;

(c) "USCG Type B1" hose means hose that meets the performance requirements of SAE Standard J1527 DEC85, Class 1.

(d) "USCG Type B2" hose means hose that meets the performance requirements of SAE Standard J1527 DEC85 Class 2.

NOTE: SAE Class 1 hose has a permeation rating of 100 grams or less fuel loss per square meter of interior surface in 24 hours.

SAE Class 2 hose has a permeation rating of 300 grams or less fuel loss per square meter of interior surface in 24 hours.

 
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