Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 178Get this manual
1998 Model
Fuel Rail Cleaning
After all fuel injectors, air regulator, tracker valve, fuel regulator, inlet hoses and outlet hoses have been removed, the fuel rails may be flushed out with suitable parts cleaning solventUsed compressed air to remove any remaining solventTorque 12" (12.7mm) hose fittings on fuel rails to 28 lbft(38.0 Nm)Torque 916" (14.3mm) hose fittings on fuel rails to 35 lbft(47.5 Nm)
aDiaphragmSpringO-Ring