arcturus;
I'm no HS4 expert but I could easily see variations in production and replacement parts being the explanation for you differences...
One thing I do note, which quite bothers me, is on the picture is the very steep angle at which float arm contacts valve shuttle on left Bowl Lid...if that is the one which overflowed, I can suggest the cause of the overflow was that steep contact angle caused shuttle to jam against valve wall instead of moving along it to close off fuel flow...do you see what I mean?...force is to side of shuttle NOT along its axis...bend float arm to correct, while keeping float height at shut-off correct also...
I just realized that what I thought was shuttle is a float arm stop...so disregard my previous, half-cocked info...just make certain fuel system post pump is clean (a post-pump filter can't hurt), floats are adjusted to shut off fuel at correct height, and valve shuttle slides freely in valve body!
Good Hunting!
Last edited by Ron Kwas; Aug 8th, 2018 at 18:46.
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