Hi,
I have a 2010
Ranger 2 tug with a
Yanmar 4BY2
engine and a Mace 2.6
generator.
About a month ago, the B+ wire from the
engine control module to the
helm key apparently corroded at a connection and the key
power became intermittent causing the engine to periodically fail. I traced the
power from the ECM to a non-accessible area under the sole where it changed color and stopped transmitting power to the key. The symptoms went away when I bridged a fused wire from the house panel to the key to supply 12 volts to the key. The engine has been fine since then -- although I know this isn't a permanent fix.
But, around the same time (not proven to be related), the
generator began to cut out when the engine was running. Eventually, I determined the generator would cut out at no-load if I turned on the key switch to the engine - even if I did not start it.
I'm guessing that generator was
fuel starved when the engine
fuel pump turned on to prime the engine. I checked the generator
fuel line and found a slight vacuum between the generator
fuel pump and the generator injection
pump - supporting the starvation theory.
So, I removed all the various filters and ensured the fuel was free to flow - same problem. I replaced the filters - ran the generator but not the engine for 30 minutes with the a/c on - all was golden.
Turned on the engine key and the generator quit.
Tried the same
experiment with the engine fuel line crimped after it splits off from the common fuel line to the tank (foolish idea). The generator ran even with the engine key on - but with no fuel flowing. I could only do this for a short time because of potential engine fuel
pump damage.
I can't believe I have 2 bad fuel pumps!
I can't find any air
leaks, but there may be a leak that only develops when both fuel pumps are running?
Any ideas, please.