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How do you know if your fuel pump on a 2001 Isuzu npr gas trucks is good or bad?
Wiki User
∙ 11y ago
Is there fuel to the fuel rail? Take the fuel line apart and turn the key to run. You should have fuel all over the place. If not, it's either the pump or the filter.
The above is not the correct way to determine if the fuel pump is bad and want to note that opening any fuel system (especially gasoline) in the noted above manner is extremely dangerous and could cause injury or death. Never open fuel systems unless you know and understand what you are doing to it. Never open any fuel system and let it "get all over the place". Always make sure fuel is being contained in a safe manner. Using the correct adaptors at the fuel rail is essential for safe fuel pressure checks and tests. They can be purchased at any auto parts store and is a must for safe testing of fuel systems.
The correct way to check fuel pressure is to use a fuel gauge with the correct adaptor to be screwed into the fuel test port on the vehicles fuel rail. Doing so fuel leakage is at a minimum and the potential of starting a fire is slim to none IF the correct components are being used. On an Isuzu NPR you will want to see around 45-55 psi of pressure. Be safe and good luck.
Wiki User
∙ 11y ago
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