hard to start when cold
 

hello
i have an 93' explorer and when it is cold it seems to take alot ot time to get fuel up to the intake to run. the fuel pump runs and shuts off after about 5 or so seconds. after it runs it will start up no problem. i have looked at the lines and from what i can tell they are fine. is there something that shoots fuel in first before the injectors?
thanks