1993 Camaro LQ4 6.0

Need help! Bought a 1993 Camaro with these mods already done to it -
-lq4 6.0 with 77k out of an 04 Denali Yukon
-243 ported and milled heads
-american racing long tube headers
-Texas speed Torquer v4 cam
-new double valve springs
-3200 circle d converter
-3.23 gears (2000 z28 rear end)
-tru cool 40k transmission cooler
-4l60e transmission (2002 camaro ss)
-factory ls k member
-ls1 oil pan
-ls1 intake manifold
-bp automotive ls swap harness.

Initially only needed a fuel pump in it, I bought a Walbro Hellcat pump, and Corvette style regulator/filter. Car ran for a few minutes when I had the pump outside the car in a bucket. Dropped the pump in the tank, and after it ran it never ran again. It?s getting fuel pressure not sure how much, but I?ll be checking tomorrow. When I checked the ECM, it?s from a 2000 Camaro 5.7l. No VATS, I just need to know how to properly tune it to get it running.

Pumps more than around a 255lph will overrun the Corvette filter/reg, your fuel pressure is likely 80-90psi or more and locking the injectors shut.

Thank you, that makes sense. I still have a new 93 5.7 Fuel Pump but I believe it only puts out 30ish PSI.

Proper fuel pressure is critical to EFI. You might need to buy a pump that works with the dumb filter/reg thing. Or reconfigure the fuel system to handle the 525lph pump.

dont be cheap, put a good regulator on it and move on