L-3400 Will only idle.

longhairlimy · Mar 26, 2013

Hi To All.

I bought a L-3400 with 120 hrs on her. Seems to have been running good. Was moving some dirt around and bingo she will only idle.When you go to power it up it die's. Got her up the the Garage.In looking at the air filter i decided to Changed Air element and fuel filter. While i was at it i drained tank and got fresh fuel.I have a good flow from tank to fuel filter.The tractor with start but will not rev up.If i push lever way up she dies.I a newbe at this stuff and any help would be nice.Weather here is in the 50's if that means anything. Any Thoughts. Thank You!

Coyote machine · Mar 26, 2013

Do you have any fuel evident PAST the fuel filter to supply the injection pump?
Did you just buy the tractor?

longhairlimy · Mar 26, 2013

Hey Coyote machine, I bought it in November. It has had an hour to cool and now it will power up. Heat seems to be playing with it. I know that if i go work it, it will play the same game.

longhairlimy · Mar 26, 2013

I was kind of thinking it was the low pressure pump.Is this how they act when they are going out?

Coyote machine · Mar 26, 2013

longhairlimy said:
I was kind of thinking it was the low pressure pump.Is this how they act when they are going out?

Seems like something must be malfunctioning when at a temperature above ambient. Could easily be a low pressure pump. I don't know if they can be taken apart and cleaned. Do you know where it is located? Can you verify that fuel is getting to the injection pump consistently?

Jerry/MT · Mar 26, 2013

Did you bleed the sytem after replacing the fuel filter?

longhairlimy · Mar 26, 2013

Yes,i just came back from running it. ran ok til i did a few loads of dirt and started running poor.

longhairlimy · Mar 26, 2013

I found this in the forums.

I would not suspect the injection pump but I would be more suspect of the diaphram pump that feeds it that the service manual calls a "fuel feed pump" It is a small round thing with two fuel lines attached located just to the left of the fuel filter. I once had a fuel pump on one of my houseboat engines that worked for about a half hour when cold and then got weak. It would idle but could not get any power. That is why I though of the fuel feed pump. It may not be the problem but is something to check. A fuel pressure meter could be inserted to check it. It does not look expensive so maybe the dealer could just swap it out if he can't find another problem.

Anyone else have this happin to them.

longhairlimy · Mar 27, 2013

Ok so after running tractor i pull the line on the injector side of the transfer pump while hot and kicked it over, Not much fuel came out. Waited till tractor cooled off and tryed it, lots of fuel. Bad Transfer pump on a tractor with 120 hrs. BINGO. $106.00 ...

Would like to says thanks to those that made comment.Thats what this forum is for.

k0ua · Mar 27, 2013

longhairlimy said:
Ok so after running tractor i pull the line on the injector side of the transfer pump while hot and kicked it over, Not much fuel came out. Waited till tractor cooled off and tryed it, lots of fuel. Bad Transfer pump on a tractor with 120 hrs. BINGO. $106.00 ...

Would like to says thanks to those that made comment.Thats what this forum is for.

Wow. do you have any theory on why the fuel pump is temperature sensitive?.. Isn't it just a little diaphragm pump? is it powered off the cam or is it electric?

James K0UA