All hoses are not created equally
Boat owners are constantly changing hoses, at least, they should be checking them regularly. But you need to get make sure that you use the right hose for the job. Not all hoses are the same, AND NOT ALL HOSES ARE THE RIGHT SIZE FOR THE JOB..
Hoses are sized by their inside diameter (ID) and hose fittings are labeled based on the ID of the hoses.
Hose should be well-supported and not allowed to sag.
One of the best ways to inspect hoses is to squeeze them. If they feel mushy, crumbly, or excessively hard, they are beyond their useful life. Also, look at the ends—if they’re splitting or swollen, the rest of the hose is in just as bad shape even if you can’t see it. Hose that has standing liquid in it, whether effluent, gas, or water, won’t last as long, which is why it’s important to make hose runs that won’t trap liquid.
Use the best marine grade 316 stainless steel hose clamps. Replace any that are even slightly rusted and double-clamp critical hoses. Clamps that are embossed rather that perforated are much stronger and longer-lasting.
Stiff hoses can be easier to install if the end is dipped in boiling water; this allows the end to stretch easier. When shopping for hose, if it is not marked properly (A1, etc.), it doesn’t meet the standards, no matter what the salesperson says.