Unable to get fuel pressure from gas tanks.

[twoodson]

Hello guys, I live in Lancaster, TX. I have a 1987 SWB with a 350 tbi with dual tanks The other day I was on the way to take my 5 year old to football practice and suddenly the truck sputtered and went dead. My mechanic noticed that there was no fuel injector pressure and the 10 amp fuse for the ECM was blowed. Replaced the fuse, turned the key and the fuse popped again. We tried a heavier amp fuse and guess what it popped again. The engine turns over but will not start. We replaced the ECM and we now had injector pressure. We can hear the fuel pumps come on. We sprayed carb cleaner in the TBI and it started. We took apart the inside dual tank switch and we tested it and it was okay. Is this a selector valve problem. Do anyone know were I can locate a printed diagram of the wiring for the dual tank setup. Thanks for your help we will get back on the truck tomorrow..HELP!!!!!