afc screw
 

correct me if im wrong but the afc screw is on top of the housing and which way do i turn it to advance it if im thinking of the right screw

You mean the boost spring that llessens the amount of boost to reach full fueling? Or the the preboost screw that sets the preboost fuel minimum stop so it limits amount of fuel right at take off. You cant advance timing through the afc

oh i thought you could advance it thank you so if i was to advance the fuel i just need to work on the fuel plate correct

Give more fuel yes plate. Advance it through plate no. Youve gotta physically advance the pump on the gear being ran from the crank and you need special tools to do it. What you looking to do? What mods do you already have?

The 91 won't have a p pump? Sorry but i don't know anything about any other pump. Do the ve pumps also have an afc? They'd have to i guess but i don't know how they're adjusted. Someone else will jump in here and teach us both.

YEs thEy do but he may have done a ppump swap so he would be in the right section.

i have aquired a new truck which is a 97 i also have a 91 but im talking about the 97, any way right now it is only straight piped and open air filter the pump has been turned up just a little bit but it needs just a little more power hopefully before long i will have 4 inch and gauges

---AutoMerged DoublePost---

i know how to get to the plate and take it out and slide or grind it i have a paper of each noumder plate i just thought there was a screw to advance fuel without taking the afc housing off

take the plug out of the afc housing and turn the star wheel it wont help much on fuel but you will notice a difference

Auto? Or manual?

shes a five speed that star wheel is what i was wondering about that cap and that is right on top of the housing