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How much fuel do you consider "a good sized puddle"...it doesn't take much and it doesn't evaporate fast so it might have leaked out after you shut down and just sat there. Even an ounce or two of fuel can look like a good sized puddle...it's probably your delivery valves and shutoff o-ring which are leaking just like mine are. I plan on doing them and the plastic lines all at once when I get all the parts together.
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I'd say the puddle was about 4 - 6 oz. of diesel fuel as I have a fairly steady leak of around 1 - 2 oz. per day. I just replaced the shut-off valve O-ring last weekend and it appeared to have no effect. I already have all the parts for my delivery valve reseal job which I plan to do next weekend, so I'll report my results then. The fuel lines were all replaced about 8 months ago so I am not planning on changing those - maybe new O-rings on some of them just to be safe. I might rig together some sort of cardboard shields around the IP valves to see where the leak is coming from.
I think I'll take Terry's advice and run a tank of B100 before my delivery valve reseal and new fuel filter next weekend.
The shut-off valve caps are M6-1.0 x 25mm.