Fuel system re primed: Chinese Tractors -- Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review Fuel system re primed: Chinese Tractors -- Jinma Farmpro Agracat -- Chinese Tractors Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Chinese Tractors -- Jinma Farmpro Agracat Forum

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 05-24-2007, 11:14 Post: 142413
newton



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 Fuel system re primed

I have a 454 i changed out the fuel filter and now I can't get the fuel system re primed. Has anyone run into this problem?






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 05-24-2007, 14:47 Post: 142420
Murf

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 Fuel system re primed

It's an air lock, VERY CAREFULLY, crack open the fuel line at (or as near as you can) to the intake side of the fuel pump, then wrap a rag around an air gun, and after turning your face away, blow air into the fuel tank using the rag as a gasket to seal up the rest of the fuel tank opening.

Even with most of the air escaping around the rag enough pressure will develop to force the air out as the fuel is pressurized a little.

Once you think most of the air is out of the system, tighten the line back up and try starting the engine. If it still doesn't want to fire try giving it a bit of fuel or WD-40 into the intake, do not use ether unless absolutely necessary, and then only a VERY small amount.

Once the engine is running, the pump is turning fast enough to blow the remaining air clear of the system, but be forewarned it will cough and sputter and likely blow some white smoke until it's all gone.

Best of luck.






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 05-24-2007, 18:56 Post: 142430
greg_g



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 Fuel system re primed

These Chinese tractors are still basic 50s and 60s technology. When gravity drains the hardlines during a filter change, air gets into them (the hardlines). In the normal course of events, the injection pump will push fuel up the hardlines with sufficient pressure to trip release springs in the injectors. But when air displaces fuel, this doesn't happen. So you must crack the hardlines at the injectors (loosen the top compression fittings), which permits the trapped air to bleed out.

But before you do that, you must make sure that the filter is full, and that there's no air in the flex line going into the injection pump. Locate the fuel line between the filter and the injection pump. Loosen the banjo fitting on the input to the injection pump. Use the hand primer to manually pump fuel through the fuel pump - through the fuel filter - TO the injection pump. When it runs raw at the injection pump, tighten the fitting.

Put the tranny in neutral. Crack the hardlines at the injectors (loosen the compression fittings at the top of the steel fuel lines). Crank the engine with the starter motor until fuel runs raw out of THOSE loosened fittings. Tighten them down.

Start the engine.

//greg//






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 05-24-2007, 21:46 Post: 142435
earthwrks

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 Fuel system re primed

I do a combination of Murf and greg's suggestion. I use compressed air at the tank filler and crack one or two fittings at the injectors. Starts up nearly instanlty every time. This even works on the Dodge Cummins system too.






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 05-25-2007, 09:50 Post: 142451
newton



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 Fuel system re primed

Thank you I will let you know how she turns out






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 05-25-2007, 09:52 Post: 142452
newton



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 Fuel system re primed

Thanks When I bought it the guy told me to never let it run out of fuel because priming was a problem. I'll let you know how it goes.






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 05-25-2007, 19:44 Post: 142461
earthwrks

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 Fuel system re primed

Primi You need to keep in mind that when they made it they had to have the most efficient way of priming it. And it won't be a problem once you find out how to do it.






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 05-29-2007, 10:44 Post: 142564
newton



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 Fuel system re primed

I did a combination of the two. I had a small cap I taped in place of the fuel cap. This allowed me to put air pressure in the tank. I cracked the line at the othe side of the fuel pump and rolled the engine. It primed fairly quickly and easy.
Thanks






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 05-29-2007, 12:20 Post: 142566
Murf

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 Fuel system re primed

Glad you got it going.

Best of luck.






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Discussion Boards > Active Subjects > Messages as Posted > Chinese Tractors -- Jinma Farmpro Agracat Forum

Thread 142413 Filter by Poster:
earthwrks 2 | greg_g 1 | Murf 2 | newton 4 |




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