2017 F90 cranks but won’t start

[mh_jenkins]

2017 F90 Yamaha cranks but won’t start. When the key is switched from the off position to the start position, the starter engages and turns the engine and it sounds like a cylinder or two fires once but no more fire. Using non-ethanol gas plenty of gas, all wiring looks clean and connected, fuses checkout, fuel bulb is firm and tight with gas pressure, safety switch has safety pin inserted, remote control is in neutral, ending turns over and over with no fire except for single cylinder fire on first attempt. Help please!

 

[mh_jenkins]

The motor started and ran fine last summer and Fall. Did I not try to start it for about 6 months though. Battery is fully charged too.

 

[99yam40]

need to know if the rail pressure is in spec.
injected motors will not run if there is not enough fuel going thru the injectors

 

[mh_jenkins]

Am not sure, will have to get that checked.

 

[mh_jenkins]

Update…this engine has two fuel pumps on the engine. The first one is electrically run and needs the engine to be run for 15 min at least every 2 months or the mechanical inside will start to rust from water caused from internal condensation. This boat set for 7 months so the first fuel pump is rusted and seized and needs to be replaced.

 

[99yam40]

I guess you are talking about the lift pump that fills the VST.
you also need to understand the pump in the VST is cooled and lubed by the fuel running thru it.
without fuel in there to pump you could have hurt that motor also running it dry.

I also think that water in the fuel itself from the tank is what caused the rust.
I do not think much if any moisture could get into the pump from air as it should not get to it in a sealed system