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We really need a model and year because their are many different ways to do this.

If the engine has a mechanical injection pump then it will have a plunger on the side of the pump . If its a later 04-05 model all the diesel engines went to a supply pump style fuel system. This goes for all models Hino, Isuzu, Mitsu, UD Nissan, etc. The pump is much smaller and compact. It isn't as complicated as the older mechanical style injection pumps.

Now on certain models there will be a plunger on the fuel filter housing, remotely located or none at all. The best way to bleed is to not get air in the filter in the first place. Pre-fill with diesel fuel or you can even use automatic Transmission Fluid as well. Yes, ATF is an oil and will burn just the same as diesel. I do it all the time and it's actually good for modern day fuel injectors becaue it acts as a lubricant. When the diesel fuel went to the ultra low sulfur design alot of the lubricating agents went away and due to the super tight tolerances in todays modern day injectors this lubrication is critical. So adding some atf into the filter isn't going to hurt anything it might help lubricate the entire fuel system and at one point Isuzu recommended adding a few quarts to the fuel tank on each fill up to aid lubrication of fuel components.

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Q: How do you bleed an Isuzu diesel fuel filter?
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