Lastec 3372 Mower Will Not Start

qbc3 · Apr 25, 2013

I have a Lastec 3372 mower with a 33 hp turbo charged Kubota D1105-T-ES engine. I haven't used it since November. It will crank, but will not fire. When I crank the engine it gets fuel at least to the fuel pump bleeder valve, but not to the injectors at the engine. It may be obvious, but does this mean that the problem is definitely a faulty fuel pump.
What's my next diagnostic step??????????

Ed of all trades · Apr 26, 2013

Crack one of the injectors loose and crank it to see if the fuel is just not getting through or if there is no supply.

qbc3 · Apr 26, 2013

Ed,
I loosened the connection point of each of the 3 fuel lines to the injectors, separated the connection points and get no fuel when I crank the engine. So, it's not getting fuel to the top of the injectors.

Ed of all trades · Apr 26, 2013

I would try bleading the pump realy well before I gave up and had the pump rebuilt.

qbc3 · Apr 26, 2013

Does anyone know if possibly a faulty fuel solenoid could be the culprit? And ... if so, how could I check the solenoid out to determine whether it's functioning properly or not?
Thanks

qbc3 · Apr 28, 2013

Here's an update. Took the injector stop solenoid off and it did not cycle when I cranked the engine. The prong stays in the extended position, but will depress with finger pressure. (The rack itself was not stuck and operated smoothly when depressed with my finger.) I left the solenoid disconnected and then took off the injector lines coming off the top of the injector pump. Cranked the engine and got the spirts of fuel indicating the pump was working. Blew out the injector lines and then reattached them back to the pump and cranked the engine and watched the fuel coming out of the disconnected injector lines at the individual injectors. Reconnected the stop solenoid; cranked the engine and no fuel came from the disconnected injector lines.
Does this means the stop solenoid is bad or maybe a bad relay to the stop solenoid?

qbc3 · May 5, 2013

Well, here is the latest status report:
I decided to try to start the engine without the stop solenoid in place. I reasoned that by removing the solenoid, I would be assuring that the solenoid plunger/fuel rack shutoff relationship would be taken out of the equation. Guess what; the engine kicked right over and ran until I manually put the fuel rack into the shutoff position.
So......, is there any reason I should not assume that the stop solenoid is bad and replacement is in order?