My question is: is the mechanical injection pump
enough to keep fuel
supplied to the engine
without needing to run an electric pump
continuously? It's a Bosch type mechanical pump
and the bottom of the fuel
tank is about inline with the bottom of the engine
I installed my new engine and got it running but the electric fuel pump
(the type that makes a distinct "tick tick tick tick" noise
when on) stays running continuously. I thought this was an issue because on my old engine, it used to (or appeared to) only run if it was purging air from the system.
I contacted the marine
engine manufacturer and they have advised that this continual running is normal behaviour. It quite probably is, but the old engine ran just fine without it running continuously.
There is a nifty circuit included in the design of the engine electrics that uses the field voltage of the alternator
to prevent the starter motor
from operating if the engine is running so it would be simple to rewire the pump to this circuit so it only activates pre-start.