Take the smallest drill bit you have, and put a hole in the cap.
If it's smaller than 0.020 or thereabouts, water won't go in if it hits; but you want multiple holes, three equally spaced is typical.
If it splashes fuel out the hole, cutout a piece of cardboard to go in the cap loosely.
Tack an edge with glue, or make a ledge with a soldering iron if it won't stay in place. (Not your good iron, lol.)
The reason I mention water above is that any drop that goes in goes directly to the bottom of the tank, and the drain.
~100 drops will kill a mower, lol.
I've seen this problem many times before; it happens infrequently enough it's hard to remember.
I painted a mower once, and caused this problem.
Looking back, I'd say heat transfer issues from the paint likely led to the 1-season demise of that mower. I think I was 10 or so, lol.
Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.
I'm not Human enough to be human; but I'm trying to fit in, and I'm learning to fake it.
"Never said Hibbity..." - Brian Williams
Last edited by Grog6; 05-25-2017 at 07:58 PM.