Question about 2006 Isuzu i-280

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Chevy 3500 diesel runs fine and then loses power at about 75 mph.

Replaced the fuel filter several times and it runs okay at first. Mechanics can't find anything wrong. Any help would be GREATLY appreciated.

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Have fuel injectors checked

Posted on Jul 23, 2009

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It sounds like several things are going on. If the fuel filter change temporarily fixes it, then it is a fuel system problem.
When you remove the filter you break the vacuum draw. Contaminants in the lines and around the pump can return to the tank. When you remove the next fuel filter cut it open and see what is inside.
You need to do a pressure check when you install the new filter and then again when the truck messes up. I would also look at the crossover valve if you have dual tanks. Have you switched from one tank to another?
If the injector pressure is ok with a new filter and bad after time has passed most likely the pump is good and the tanks and lines need to be removed or cleaned out.
Let us know the outcome-thanks.

Posted on Aug 16, 2009

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