2000 chevy express 1500 eng-1 fuse blowing

Hi everyone. I'll try to give as much info as I can in the hopes someone can steer me in the right direction. It's a 2000 chevy express 1500 4.3 liter.

I was driving down the highway, and the motor gave a studder, 5 minutes later, another one. 3 minutes after that, it just died. Get it pulled over, cranked, but no start. Had it towed to the shop I normally deal with (214 bucks). They did a quick look over, then pull the air filter out. Shot some quick start while another cranked the engine. It sputtered, and he said "fuel pump".

Next day, they dropped the tanked, replaced the fuel pump. Didny start, said something about reversed wiring, he corrected what ever it was, and it started up. The van was pulled out and left to run while I paid the bill (15 minutes and 641 bucks). Step into the ban, put it in reverse and just died. No crank.

The push it back in loll it over and say "blown fuse and bad fuel pump relay". They replaced them, and sent me on mmy way. I made it about a block, and it does again. Eng-1 fuse blew.

Can't afford 3 or 4 hours of shop time right now. Spent all I could for now. Had it towed to were I am staying.

What I have done far is checked the fuel pump and starter relay (googled how to check a relay) and both seem to be fine. I replaced the fuae with a 25 amp (all I have right now), and even just turning the van on, pops the fuse instantly.

I've read various posts to know that the fuse has nothing to do with the fuel pump. Could they have done something when they replaced it?? I'm guessing a melted wire somewhere, but not sure where to look. Would an obd2 scanner give me a hint where to look (I can get a cheap one)?

I'm not very techy with a time of tools, nor floor jacks or even ramps, but any advice or direction on maybe where to lookm would so be appreciated.

And I do apologize for the long post. Thanks