While my engine fires up consistently, it usually takes a few seconds from turning the key to successful ignition. This is with a Holley Super Sniper EFI, electric fuel pump, -10AN supply, and regulator on the -8AN return. I do not have a check valve anywhere in the fuel lines, and I notice that the fuel pump doesn't load up for a few seconds so it's probably priming free-flow before it builds pressure, hence the delay in ignition.
If I allow the fuel pump to prime for 3 seconds and load up (audibly) by leaving the key on "run/on" prior to attempting to start, it fires up quicker but still takes a second or two. Holley says starting should be nearly instant and no dwell is necessary.
Is that a typical issue? Should I have put a check valve up by the Holley unit to prevent drainback?