Old dog learns new trick

[jinman]

I learned something new yesterday. That's not all that abnormal for me, but what makes it embarassing is that I have told people our Class III tractors don't have a fuel lift pump when they certainly do. It's been staring me in the face all along, but I never put it together until yesterday and did a lot of research to find it listed on the parts diagram. Interestingly enough, the only other place I've ever seen it mentioned was in a simplified block diagram in the Repair Manual. In the fuel section of the manual, they don't address it and don't mention checking it for proper function in any troubleshooting chart that I can find. What's up with that?

Anyhow, it's directly behind and below the fuel filter. It's been there all along and waiting for just the right time to humiliate me.:laughing:

 

[JC-jetro]

Well, thanks for sharing Jim. Hmmm, a bit strange ... I could have seen to have a lift pump on gasoline engine to avoid flashing the warm gas in the summer if suction pressure was above the gasoline vapor pressure at given temp. Did not expect that on diesel fuel that is a lot less flammable. On commercial application of fuel delivery from an underground tank my choice is all most always is submersible pump to avoid fuel flashing if combination of lift and pressure drop causes flashing. I suppose that's what they are trying to avoid. You can push the fuel as far as the pump allows you but can NOT suck the fuel the same distance in an atmospherically vented system. is fuel outlet from your tractor below or above the injector pump intake? as you know on many tractors the fuel is gravity fed to the injector pump. Now, I know too.

JC,

 

[Jbrink64]

The ISM engines (Shibaura) is also produced for Perkins and Cat. Some engines go into NH compacts, some into skid steers, and "Catikins" end up in chippers, mowers and such. Who knows where the tanks will be...everyone gets lift pumps now.

 

[jinman]

The ISM engines (Shibaura) is also produced for Perkins and Cat. Some engines go into NH compacts, some into skid steers, and "Catikins" end up in chippers, mowers and such. Who knows where the tanks will be...everyone gets lift pumps now.

I can sure see where that would be the case. I believe on our tractors that if there is significant fuel in the tank (behind the operator platform on Class IIIs) the fuel will self-feed to the injector pump. I think that way because when I change fuel filters, I loosen the filter and turn on the petcock. Fuel fills the fllter and spills out, eliminating the air pocket. All this without the engine running. The transfer/lift pump is there, but not normally needed.

 

[Jbrink64]

going uphill in a class III and les than 1/4 tank could be a problem without the lift pump. The lift pump is a very low pressure unit. The cartridge style injection pumps will work fine with gravity feed.