my 502 quit on me while driving. it would start and idle but when I get up on plane it would dye. I made it back to the launch idling. I found a wire off a relay that led to the fuel pump and put it back on, a few days later I tried it again and it wouldn't even start. its a mid 90's 502 fuel injected. any one else had this problem that can help me out?

Check the relay! You may of damaged it. Check power to the fuel pump make sure its getting power. Also check all the grounds and make sure there is no corrosion.

When you first turn on your key, the electrical fuel pump inside the VST should run for 2 seconds. Put your ear over the VST tank and have your buddy turn the key, (DO NOT START ENGINE). You should hear it run. If not at Mtuned posted, replace relay, replace fuse, fix you wiring to the pump, double check grounds.

Thanks guys. Turned out to be a old fuel line had a crack.