L1500 cranks, starts and then quits. Help.

[rbrown7713]

I crank it with the glow indicator on, it starts momentarily with grey smoke and then quits. It was running a month and half ago, but won't start now. Would the fuel go bad in a month and a half. Took the air filter out, so getting air. Help.

 

[vic gerbasi]

i suggest making sure that it is getting air no plastic bag etc interfering

 

[chieffan]

Not familiar with your L1500 but on my B7100 I run the glow plugs for about 20 clicks on the hour meter, which is close to one minute, then start it.

 

[rbrown7713]

OK, I will try that. No air obstruction, checked that. Drained old fuel and put new fuel in. Thanks, Bob.

 

[Tooljunkie]

Part throttle or at idle, may want to check to make sure stop lever is operating properly. Fuel valve at tank on? And also make sure decompressor is not activated. Or partially activated.

 

[rbrown7713]

Yes sir, all that is in order. Tomorrow I will bleed the injectors for air, watched the video on that, so that might do the trick according to the info. Thanks, Bob.

 

[Tooljunkie]

Could be a leaking fuel line, sucking air.
Hope bleeding gets it going.

 

[rbrown7713]

OK, it's running. I had to take off the injector lines and blow them out and then the fitting on the injector pump, I loosened them, and when I did, there appeared 3 to four little bubbles, and then clear fuel, that did it. I put the lines back on, bled them at the injectors and it cranked right up. Sensitive little buggers, aren't they, so thanks everyone for your help. It is running like it has a burnt valve, it misses, so it looks like a valve job. Bob.

 

[Tooljunkie]

Valves need adjusting once in a while.

 

[North Idaho Wolfman]

It is running like it has a burnt valve, it misses, so it looks like a valve job.

Not very common for these tractors to burn a valve.
First, pull the valve cover and check valve lash, a loose rocker will cause a bad fire.
Then check the injectors, with it running crack each injector and listen for an RPM / smooth running drop.
If one is totally different then the rest, pull that injector, and another that was running good and swap the 2, bled start and run then do the test again, if the problem follows the injector, bad injector, if it stays in the same place, it's either the injector, the injection pump or the valves.
crud test on injection pump, pull all lines and set throttle to max, while cranking engine look a fountains coming out of injection pump output ports, if they look the same then most likely the injection pump is fine, if the one with the bad fire is a low fountain, injection pump will need rebuilt.

 

[rbrown7713]

Thank you very much, sounds like very good procedure to find the problem, Bob.