I don't have a belly pan, but I do have a lift...and I can see all the way from the bottom to the IP. I can also see the top. I already sprayed it all clean with break clean and dried it all off.....then put it on the lift and watch both the top and the bottom....no leak....drove it for a couple days, and parked it....and the next day there was a big spot on the ground.

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL

OK, I did some more research and this is still stumping me.

I drove the car for a couple hours over the weekend and then put it on my lift. I left it there for 2 days, and no leak. I kept looking under it and it never dripped.

Now before that, it was parked in my garage for a couple days and there was a good size spot on the ground.

What would make it leak sometimes and not others? Is there something that happens after an extended parked period, that would release fuel?

I hate problems that only happen every now and then.

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL