JDMB20TDA

replaced an engine mount at my buddys shop last night and upon getting rear mount and engine all back in its normal position I try to start it and it just cranks over.
If given gas 1/10 attempts it will pop over, miss, not idle and, run like complete garbage.

The car was 100% solid prior to removing the mount/reinstalling it.
I am throwing a Map code, as I am running a GM 3bar it still had no CEL prior and ran like a champ.
But now I get this Fuel supply code, this is where im stumped.
The fuel pump primes and I can smell fuel also (as i said it can get running rarely, but if pursuaded)
Main relay clicks for pump prime.
Fuel rail pressure is only ~30psi. I am running 1000cc injectors which may be the reason.
What causes the fuel supply system code?
and what would be the first place to start looking?

JDMB20TDA

Problem solved

being there is zero O2 feedback and Im running zero o2 sensors. It was getting all its info from the tune/map sensor and upon closer inspection one of the wires on the GM 3 bar was pulled a bit too far outta the connector.
although it didnt act like most failed map sensors it makes perfect sense.

JDMB20TDA

Still wont idle, Fuel supply Code 41 still after disconnecting ecu.
Car runs very bad and falls on its face above 4 thousand rpm.

SRS Light is a constant.