L175 - Fuel Injector Problem

[kubotamark]

I am looking for some advice on a fuel delivery problem on my L175. I followed OTT advice about bleeding the fuel injector lines on my tractor. The injector line closet to the steering wheel spurts out fuel great. However, the other line is barely putting out any fuel. Need some help trying to figure this one out. This problem is making is difficult to start my tractor. Thanks for the advice!

 

[Tooljunkie]

Theres three injectors.one high pressure line, one return line on each.
Loosen all three injector high pressure nuts and let us know what you find.

 

[kubotamark]

My L175 is only 2 cylinders. I have only two lines.

 

[Daren Todd]

I had a similar problem with mine, had a diesel bugger clogging the second port on the injection pump. Disconnect that one line, check to see what kind of flow your getting at that port on the injection pump when you crank it. If your getting good flow at the injection pump, then the injection line is partially clogged. You can clean out the line with an air chuck

 

[Tooljunkie]

Dont know what i was thinking, i am confused. Too many long hot days i guess.
If you do remove lines, be careful to not bend them,they are quite tough and you want everything to seal when you are done.

 

[ShaunRH]

If the line is short enough you can use a long pipe cleaner as well.

If you're getting algae or something you have too much water in your fuel system.

 

[North Idaho Wolfman]

Pull the 2 injector lines off the injection pump and while cranking, throttle set to mid to low, check to see if the pump is putting out the same flow on both ports if it's not you need to have the injection pump rebuilt, and while your at it do the injectors too.

 

[kubotamark]

Thanks for the advice. I followed everyone's advice last night and I am getting hardly any flow out of the back injector valve. How hard is it to rebuild for DIY'er? Would it be easier and better to take to a mechanic to rebuild? Anyone know relative cost to rebuild?

 

[Daren Todd]

One thing you can try before having the pump worked on is loosen the port thats not doing too hot. Loosening the fitting that the injection line hooks too. It's got a spring and small ball bearing in there to meter the flow. Loosening it will allow fuel to free flow out that port. Mine started acting up like that, and ended up being full of fungus. Letting the fuel free flow thru it allowed all the gunk to be flushed out. Make sure to tighten the fitting back down all the way. And then check your flow again, by cranking the motor.

If that doesn't fix it, then it's time for a rebuild like wolfman stated

 

[kuboman]

It could be as simple as the delivery valve is stuck or dirty but it may be better to take out the injection pump and have it checked/rebuilt.

 

[kubotamark]

Thanks for the advice, Daren. I will try and let you what happens

 

[coachgeo]

I've dissasmbled older MB injectors for cleaning with a little success. I used alluminim pie pins. One for each injector. Purchased carb/part cleaner chemical that is the type used in cleaning machines in mechanics shop. it is a Soak it stuff not spray on. Often comes in gallon can. Though in hind site doing some spray cleaning ALSO may be good to help clean the micro sized holes. Cover your eyes.

Dissassembled noting EXACTLY how things came apart. Order of shims, way spring was oriented etc. Note here that injection shops I've been told actually dissassemble/assemble in nearly medical grade clean rooms. This is because a fine piece of dust can clog an injector hole. In the pie pins I soaked the parts for each injector. Sloshed it back and forth.. let is soak... sloshed it again etc. Did this for about a couple days of soaking. Reassembled them and the car.

What a difference it made. I had no way to do an injector spray pattern test but it must have made a difference.