A bit of an update in the my diesel
mystery. I have tried the following:
I spread some talc power on the engine
block near the accessible diesel tubing...
I wrapped all accessible diesel pluming connections (hoses) tubing etc... with paper towels
and I of course removed all the diesel from the bilge
before these tests and ran the engine
several hours including sailing with it on and both tacks.
The tank is not down about to about 2/3 full.
Talc test showed perhaps one bleeder valve leaking a tiny bit and the nut was tightened. No other tubing connections showed any leaking.
Wrapped connections were all negative
The diesel leak... whatever it is definitely much less. But there continues to be a small amount of diesel floating on the little bilge
water. The absorbent clothe under the engine showed diesel... I think the bilge under the block has a peak and slopes mostly aft but somewhat forward. The cloth held most of the diesel with may have leaked where the block is but "excess" would more likely run aft. I've changed this and the tell tale red diesel stains seem to be decreasing and more of less at the fuel filter
... which FEELS dry and passed the paper towel test.
All in all there is very little diesel leaking, but any amount is too much!
Focus on fuel filter
area, hose and connections /checking/replacing the absorbent cloth to more precisely identify where the source might be originating.
Top off tank and see repeat the tests above to see if the leak is the tank itself... near the top. The pressure test seems like another approach.
The fuel fill hose is at the top of the side... not leaks