Posted: 6/27/2011 6:14:07 AM EDT
| Anybody know the correct way to prime a diesel engine after installing a new fuel filter? Got a young guy logging my place out, and he's got a crappy log skidder that doesen't run half the time. Anyway, the latest problem indicated a possibily clogged fuel filter. We changed it and thought we primed the system properly, but I'm thinking not! Fuel comes out of each line (4) but not in any great stream, the machine will only run when starting fluid is being squirted into the air intake, quits when you stop, any ideas? |
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Is there a hand prime pump?
Is there bleed screw on the pump? Did you try any air to the fuel tank? Did you fill the new filter before installation? Does It have a fuel transfer pump on it? Is there an inlet screen filter in the pump? Some engines can be a bear to prime and keep running when you run them out of fuel I have found light air pressure to the fuel tank helps push fuel into your pump. |
| From the couple times I have primed them, I just slightly "cracked" open the coupling nuts on the injectors and the flow was very light. Diesels use more pressure than flow to make the injectors pop. Any air in the injector lines will compress which will keep the injector from opening. |
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Quoted:
This engine is pretty basic. Yes, there is a lever on the fuel pump to prime it there's a lot of stuff thats been cobbled up on this thing, the skidder is articulated so the fuel tank is in the rear section, I threw a bottle of stuff to dispel water into the tank (cap doesen't look that great, and it does sit outside all the time)
Is there a hand prime pump? Is there bleed screw on the pump? Did you try any air to the fuel tank? Did you fill the new filter before installation? Does It have a fuel transfer pump on it? Is there an inlet screen filter in the pump? Some engines can be a bear to prime and keep running when you run them out of fuel I have found light air pressure to the fuel tank helps push fuel into your pump. |
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Quoted:
You should have filled the new filter with either diesel or tranny fluid before putting the filter back on. if not you will need to crack open the lines at the injectors to bleed the air out. We filled the new filteras much as we could, and checked to make sure fuel was coming out of each line. |
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Bleed it at the filter, then at the injector pump. Then crack the line to each cylinder from 1-4 while cranking the engine. Make sure the throttle is wide open. By the time you close the line on the 4th cylinder it ought to fire right up. A few bursts of starter fluid to the air filter during this process should help. When it's just the starter running the injector pump you are not going to get a lot out of the lines at the cylinders. Got to use the starter fluid to get the engine to turn over.
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What engine?
Usually there is a bleed screw above the filter. Open it. Pump that lever until fuel comes out. Those little lever pumps can't presurize anything. So you have to open something to let fuel fill the filter. Usually there is no need for cracking lines to each injector or the pump. |