User guide
1999-2004 Ford Mustang 4.6L 2-V 
Fuel Rail Kit 
Part #5016 
3 
INS-128 
STEP 13 
STEP 14 
•  Reconnect the negative battery terminal. 
WITHOUT STARTING THE ENGINE Turn the 
ignition to the ON position for 3-4 seconds, 
(primes the fuel system) then OFF 3 times and 
return to the ON position. Check all connections 
for fuel leaks. CORRECT ANY LEAKS 
BEFORE STARTING!!! Re-install the intake 
elbow and re-attach all connections. Re-install 
the air inlet tube. 
•  To avoid a possible check engine light 
activation, start the engine and let it idle for 
about 5 minutes, then drive the car at part 
throttle for about 5 minutes before applying 
heavy or full throttle. Otherwise, any air 
bubbles/pockets that may have entered the 
system will cause the Check Engine light will 
come on and will need to be reset with a Proper 
OBDII tool. 
(1) Driver side rail 
(1) Passenger Side Rail 
(2) 10-32 x 1/4” SHCS 
(2) Sensor mounting washers (small)  
(4) 1/4”-20 x 3/8” BHCS 
(4) M6x1.0x16mm BHCS 
(4) Rail mounting brackets 
(1) Spring-Lok fitting 
(1) Regulator base O-ring 
(5) O-Rings + (1) Spare 
(12) Mounting tab washers 
(1/4”) (15”) 3/8” Hose 
(1) 13” Fuel line hose 
(2) 9/16” Rail end plugs 
(2) 9/16” Male-Male Rail end adapters 
(2) 9/16” 90°Pushlock hose swivel fittings 



