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Do diesel engines need to be bleed before first start? and if so how?

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First start as new engine? and if you need to bleed it you can either crack the fuel injectors or the fuel filter i would start with the fuel filter first

Posted on Nov 27, 2012

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How to bleed the fuel system in the 2009 Mondeo after changing the fuel filter on a diesel


You don't. You just crank the engine until it starts. Modern vehicles work on a pressurised system with a return back to the tank. The fuel is pumped from the tank to the injectors and excess fuel is returned to the tank.

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How to bleed injector pump on isuzu nkr pick up


These are self bleeding so if diesel is getting to the pump it won't need bleeding. If you still feel the need to bleed the system then loosen one injector pipe turn the engine until you see diesel coming tighten again it should fire up. If you have a good flow of diesel coming from the filter to the pump and diesel at the injector pipe then your pump pressure may be low. To check remove any injector reconnect the pipe to it with the injector end where you can see it. Turn the engine with the starter a few times the diesel should be making a mist. Wear eye protection for this test

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You should need go empty on a diesel. You will need to bleed the system for it to start. Some do it on their own from simply cranking. You might try a couple of shots of starting fluid in the air intake. First remove the air filter. The speed of the engine turning runs a fuel pump that pushes the fuel to the injectors.

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1 Answer

How to bleed a diesel bus engine


there will be a small hand pump either on the diesel pump or on the filter. bleed the filter out first and then open the bleed screws on the pump and pump until you get straight fuel., The pump may requiring unscrewing the handle/knob first so that you can move it up and down to pump. When finished remember to re screw it back down. crack the injector lines and turn engine over until you get drips of fuel from the nuts. continue to turn over the engine while tightening the nuts and it should start before you have finished with the nuts.

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1 Answer

My 2002 chev. diesel truck turns over but wont start, new filter


anytime you change the filter in a diesel you have to bleed the air out of the fuel system. The pump won't auto bleed the fuel system for you. every place in the fuel system that has a flare type connection needs to be bleed, start at the connection closest to the tank, loosen the connection and then crank the engine until you see diesel fuel drips from that connection. Tighten the connection while the engine is still cranking. Move to the next connection that is going toward the engine. Continue on in that manner toward the engine until you reach the injector pump/injector. Once you reach the injector pump be VERY aware that the fuel is at VERY high pressure. Do NOT put your body parts in the stream of high pressure diesel fuel. It could kill or injure you! Once you bleed all the way to the injector pump/ injector, the truck SHOULD start. Do not bleed after the injector pump because of the pressure involved, it is WAY too dangerous.

Good luck!

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1 Answer

Bleed fuel system


There is often a bolt on top of the diesel pump which you open up in order to bleed. You open the bolt up a few turns until it's loose then crank the engine until fuel comes out around the loose bolt. The engine should start up at the same time.
It doesn't matter if you open up a bolt that's not the bleed bolt, just tighten it up and try another bolt until you find the bleed bolt.

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1 Answer

6.2 diesel will not bleed diesel


Make sure all lines are light when turning engine over.While turning engine over loosen the a line closes to pump or the fuel filter.You should get some fuel.Then continue on all lines working farther away.

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1 Answer

Diesel 1989 F-250 set too long and will roll over


You may have to bleed the fuel system. There may be a very small air leak in the fuel supply line and after a long time idle, the fuel seeps bac into the tank, leaving an air lock in the pipe. When you go to start, this air makes its way into your injection pump & needs to be bled out before the engine will start. Begin from your fuel filter bleed valve, next the injection pump using the primer pump to transfer the fuel. Next loosen off the injector pipes and crank the engine over until fuel sprays form all the joints. Tighten injector pipes and start. It may run a bit rough for to begin with, but will soon even out. If it doesn't start, repeat bleeding of injectors.

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2 Answers

My 206 1.9 diesel wont start


a diesel engine can only cutout when overheating, loss of diesel fuel and air leak in the fuel system. if you know how to bleed or ask somebody to bleed right after it stall, then start the car, if it starts immediately then it is sucking air.

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2 Answers

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just crack the injector nut crank it over till fuel comes out tighten nut,and so on to the others.

Jan 15, 2009 | 1985 Ford F 250

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