Fuel tank leak

I have a compressor, I was thinking of putting some air through the filler cap breather pipe and see if it holds pressure. But I’m not sure that I could seal up everything adequately to measure a pinhole leak with accuracy. Unfortunately this will require waiting for my back to improve a little more before I lug the compressor to the boat
DO not waste time with a compressor that is designed for low volume and high pressure. Use a dinghy pump. It is more than adequate and might not blow up your tank.Is the fuel tank level still going down now the boat is static?
 
Don’t forget to change fuel filter after trial run as there will be shit in the tank and the old filters , what plane is Volvo Paul coming on.
 
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