Hi

I recently had my xg falcon converted to LPG injection (prins vsi). I notice the car is getting harder to start every time( hot or cold, a little harder to start in the morning).
The trick I am using to get it fired most days is crank it for a few seconds then stop, wait for the fuel pressure to build again, then crank it a second time, it seems to start no worries after the second crank...

I am thinking fuel pressure regulator, but at $250 genuine, I will be trying other options first!
Fuel filter was done a few months ago...
Fuel pump was replaced before I had the gas conversion!

Also, the fuel pump seems to be loud when the car has been running for a while, but under closer inspection the buzzing noise seems to be loudest under the engine bay? Confused!