Lumpyfat

My transmission in my 96 civic cx was falling basically falling apart, and I found a cheap engine from a 2000 so I put it in, but I can't get it to start.
Using the stock obd2a ecu/harness, but re-pinned the distributor dizzy plug so it would plug into the harness. Everything else basically bolted on, the only thing from my old engine is the clutch slave cylinder. When I turn the key, the fuel pump won't prime or run. I know the pump is good because I went to the relay and bridged the battery/pump connections and the pump ran. Because of that I figured the relay was dead so I replaced it, but still the car won't start.
Any advice would be amazing! Thanks in advance!

eghatch9295

iTrader: (1)

check grounds, specifically thermostat

Lumpyfat

Thermostat ground, and the grounds on either side of the engine are clean and tight, still nothing...