2008 Tige Z1 5.7 MEFI 5 (180 hours since boat bought new). Boat filled and stabilizer added before storage in dry un heated garage last year. First day on the water it stumbled and wouldn't respond to throttle from idle after about an hour and quit, it would re start but not idle, towed to the dock (30 minutes) would start and run fine. Emptied 5 gals fuel from tank and put fuel/ water additive in it.
NO CHANGE
Emptied the tank thinking fuel contamination, added new Premium fuel from different station, added water filter before the low press pump.
NO CHANGE
Found elec boost pump intermittent when powered to the battery, Replaced it!,
NO CHANGE
NOTE: Boat starts and idles fine but then stumbles when throttle applied, we can then get it running at higher RPMs but then all of a sudden drops power and chugs. Also if idling for short periods then again it won't respond to throttle and stumbles and back fires.
Oil press sits at 54-55, eng temp at 140-148.
What should fuel press normally be from the high press pump when running?. This seems to be a fuel problem.
We are in Medicine Hat Alberta.
Thanks. Keith
NO CHANGE
Emptied the tank thinking fuel contamination, added new Premium fuel from different station, added water filter before the low press pump.
NO CHANGE
Found elec boost pump intermittent when powered to the battery, Replaced it!,
NO CHANGE
NOTE: Boat starts and idles fine but then stumbles when throttle applied, we can then get it running at higher RPMs but then all of a sudden drops power and chugs. Also if idling for short periods then again it won't respond to throttle and stumbles and back fires.
Oil press sits at 54-55, eng temp at 140-148.
What should fuel press normally be from the high press pump when running?. This seems to be a fuel problem.
We are in Medicine Hat Alberta.
Thanks. Keith