Those intermittent vacuum side leaks
are a pain.
I use a mityvac to check if each section will hold vacuum. As hose gets old it can delaminate internally. This can lead to very small and sometimes intermittent leaks
. Very hard to find they are. Often you need to move the hose around to find the leak.
The other common cause of these leaks is at the hose clamp. Those cheap
sharp edged junk clamps also get the float test. A nice awab ss clamp has rolled edges and wont bite into the hose. They can also cause issues because they are stiff.
Wrapping the hose with pvc electrical
tape before fitting the cheaper more flexible clamps both protects the hose and gives you a visual indicator when the hose is deteriorating.
Also make sure all hose ends are on barbs not straight pipe. Not only is that a safety
issue but they will leak much more often.
I treat diesel
fuel leaks like I treat batteries. I give all the flexible bits and pieces the float test. Ie if they float they can stay in the boat.
I would take the opportunity to replace all the flexible fuel lines and clamps once I identify the leak. If one hose is causing issues then the others are likely to join in the fun.
I can't help with the nails so you're on your own there.
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