system consist of a Racor
900 feeding the main engine
500 feeding a Nanni 15hp which is a 12v generator
Both filters have a fuel
valve before and after the filter and a bypass valve to allow the main engine
to run from the generator
fuel supply via the Raycor 500.
I am thinking of adding a hand fuel bulb before the Raycor 500 to allow the priming of the Raycor 500 filter and assist in bleeding the generator (It is mounted above the main engine so it take a long time to bleed the system using the generators lift
I am hoping the fuel bulb on the generator can also be used to prime the Raycor 900 filter of the main engine by opening the bypass valves and forcing fuel into the Raycor 900 filter from its fuel outlet.
Will this work?
I believe the Raycor filters have a non return valve on the inlet, but to fill the Raycor 900 with fuel I would be forcing fuel back through the outlet.
I could simply add another fuel bulb before the main engines Raycor 900 filter, but this introduces some extra joints in the fuel system to the main engine and if the bulb should fail it disables the main engine and allows fuel to leak in the engine bay creating a possible fire hazard.
The 12v generator is run very little (solar provides power normally) so the fuel shut off valves to the generator are nearly always closed meaning a split in the fuel bulb on the generator circuit would be very unlikely to leak fuel. A split in a fuel bulb disabling the generator would be a minor inconvenience that could be fixed at leisure, a similar problem on the main engine fuel line could create more serious problems as the main engine could be required urgently.
I have never heard of someone priming a filter by forcing fuel back up the outlet or using a single
priming bulb to prime 2 separate fuel systems, but it seems to be a good simple safe solution, but before I cut into my fuel hose I was hoping for some second opinions.