IH 674 Fuel Problem

ClarkR · Apr 27, 2015

Well finally got the 674's diesel engine rebuilt over the winter. The severe blow by was due to ring and sleeve problems. After a little break in got it out to do some work this weekend. Along with the rebuild I had the injector pump rebuilt and injectors checked with new tips. Also installed new fuel filters. After about 1.5 of bush hogging it lost power and shut down like out of fuel. Checked the tank, had fuel. Could see fuel in the filters (in glass bottoms). Loosened the drain valves under the filters. Left one only dripped and right ran a very small amount of fuel. Opened the top bleed screw and no fuel at all. Tried blowing in the tank to create pressure. It would crank, but almost immediately shut off. Still no fuel out the bleed screw. I didn't have any replacement filters on a Sunday, so pulled it to the shed. It's about 50 miles from where I live so it will have to wait till this weekend. Very frustrating, must have close to a complete blockage. Advice appreciated. Thanks

JimB2 · Apr 27, 2015

Hi Clark, probably junk blocking the outlets of the fuel tank. A quick fix is to take the fuel line that comes from the fuel tank to the top of the first fuel filter off and blow air backwards into the tank. This will be a short term fix. Long term fix is remove both outlets at the bottom of the fuel tank and drain tank and clean the outlets. My brother's 684 had the remains of a lady bug in the bottom of the fuel tank blocking the outlet.

JimB

ClarkR · Apr 27, 2015

Thanks Jim. So you're thinking the filters aren't clogged? What would I be facing in terms of air problems if I pull the valves out of the tanks and clean out the tanks?

JimB2 · Apr 27, 2015

Clark, Re filters or clogged tank outlets. My test is with a clean bucket to catch the fuel remove the fuel line that comes from the fuel tank and connects on top of the first fuel filter and let it drain into the bucket. If the fuel does not flow the full of the fuel line then there is a blockage in the line from the tank. The filters also can be clogged as Diesel fuel can have a bacterial slime in it and clog the filters.
Re bleeding the air from system afterwards, starting from first filter closest to the fuel tank, loosen bleed screw and let fuel flow until air bubble free, close that bleed screw and do the same with the next filter.
Next put STOP/START/RUN lever on START, put throttle at about half throttle and attempt to start the engine. DO NOT crank starter for long periods of time. If tractor doesn't start then loosen one of the nuts on the injector lines on the rear of injection pump and try to start again. Sometimes some air pressure in the fuel tank helps.

Hope this helps
JimB

ClarkR · Apr 27, 2015

Thanks. It does help.

IH 674 Fuel Problem

ClarkR

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JimB2

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ClarkR

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JimB2

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ClarkR

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