B7800 No Start

[Jack McArdle]

Hey - Newbie here. Got a B7800, was running, then quit. Now I can crank engine over, but can't start. I have fuel to the fuel pump, nothing after. I have no power to either wire going to (what i assume is) the fuel cut off solenoid. I removed the solenoid, and if I throw 12 volts to it, the plunger oscillates rapidly. If I crank w the solenoid off, it fires.

So - the question is: should the solenoid plunger oscillate in and out? And why don't I have any juice to the solenoid plug - ie which interlock would allow the engine to crank, but the fuel to remain cut off?

Thanks!
Jack

 

[KubotaTech]

The fuel solenoid only has power when you shut it off. It is on a timer that energizes the solenoid when you shut it off. If it runs when you take it out, it sounds like your solenoid is stuck in the off position.

 

[Jack McArdle]

Thanks so much for the reply. I assume that the rapid oscillation of the plunger when I throw power to the contact is not a good thing, and I'll need a new solenoid. The off position is plunger out, right? Is power thrown to it only when you shut down a running engine? Because I'm not seeing any power to it now with key on or off.

 

[kuboman]

I don't think the 7800 has a shutdown timer on the solenoid. It is energized with the key on and de-energized with the key off. No timer

 

[KubotaTech]

Kuboman you may be right, I was just assuming it was like some of the others. Sorry for the bad info, if that is the case.

 

[kuboman]

Kuboman you may be right, I was just assuming it was like some of the others. Sorry for the bad info, if that is the case.

I have not figured the pattern as to why some do and some don't have a timer but I am quite sure yours will not. You should here it snap on with the key and off with the key.

 

[Jack McArdle]

Thanks all for your help. I pick up the new solenoid friday, I'll then update everybody as to power on or power off. This is a great forum!

Jack

 

[mohashi]

When you removed the solenoid is it fairly straightforward removal and installation?