Fuel pump outlet grommets (also referred to as outlet seals or outlet
o-rings), are crucial in building and maintaining fuel system pressure.
Many powersports fuel pump assemblies use outlet seals in between the fuel
pump motor and the plastic assembly in order to seal the transition from
the fuel pump to the primary fuel line. If the outlet seal has
deteriorated, fuel pressure will bleed back into the tank, which can cause
a hard starting condition, or reduced engine performance. Rubber grommets
are also commonly used as a dampener at the base of the fuel pump motor
where it comes into contact with the bottom of the assembly canister or
fuel tank.
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