Check your gas cap, I had the same problem and it turned out to be the seal in the cap had gone porous, it was fine if the tank was low but when you filled up it would start stinking after about 10 minutes. The fuel slopping about was soaking through the seal and leaking out around right hand bends. One new gas cap, no further smells.
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Phil
'67 C10 long fleet.
350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon
2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission
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