my truck when it warms up starts cutting out, BAD. it gets so bad i have to stop and let it cool for a little bit because it won't pull itself. ive rebuilt the carb, changed the filter used fuel treatment, checked the firing order, So now what?

This mod. used a Z20 or a Z24 eng.and a SD25 diesel. A common problem was that the electric fuel pump has a filter cartridge in the bottom and gets over looked alot. Also there is a fuel pump control relay under the rt.side dash that goes to open curcuit when it heats up. It's on the rt. side under the dash bolted to the kick panel is black in color and has a 6 wire connector. You can hit it at times when it stalls and it will restart.