I suggest you never use silicone based gasket anywhere gasoline goes ...
check what gasoline does to three bond 1211 vs 1194


Three bond 1211

Chemical Resistance
Item (Change in weight %)
Water -0.5
Anti-freeze -0.35
Gasoline -20.2
Engine Oil +5.0
Gear Oil +2.10

Chemical resistance of TB1184/TB1194
Item Mass change
(%)
Immersion
temperature Test method Remarks
Water -1.9 Tap water
Saline solution -2.1 10% saline solution
Anti-freeze -1.9
90 to 95°C
50% ethylene glycol
10% H2SO4 aq. -1.6 -
10% NaOH aq. -2.0 -
10% KOH aq. -1.4
25°C
-
Test lube oil No.1 -4.5 -
Test lube oil No.2 -3.6 -
Test lube oil No.3 +0.9 -
Engine oil -1.6 -
Turbine oil -3.8
95 to 100°C
-
Gasoline -2.8 -
Fuel oil B -3.1 Isooctane/toluene
70/30(Vol)
Kerosine -1.3
45 to 50°C
JIS K 6820
-